Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # Os *** ** * ** *** ``` class Os ``` |---|---| | [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) || | ↳ | [android.system.Os](https://developer.android.com/reference/kotlin/android/system/Os#) | Access to low-level system functionality. Most of these are system calls. Most users will want to use higher-level APIs where available, but this class provides access to the underlying primitives used to implement the higher-level APIs. The corresponding constants can be found in `https://developer.android.com/reference/kotlin/android/system/OsConstants`. ## Summary | Public methods || |---|---| | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#accept(java.io.FileDescriptor,%20java.net.InetSocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, peerAddress: https://developer.android.com/reference/kotlin/java/net/InetSocketAddress.html#!)` See [accept(2)](http://man7.org/linux/man-pages/man2/accept.2.html). | | static [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#access(kotlin.String,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [access(2)](http://man7.org/linux/man-pages/man2/access.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#bind(java.io.FileDescriptor,%20java.net.InetAddress,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, address: https://developer.android.com/reference/kotlin/java/net/InetAddress.html#!, port: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [bind(2)](http://man7.org/linux/man-pages/man2/bind.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#bind(java.io.FileDescriptor,%20java.net.SocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, address: https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#)` See [bind(2)](http://man7.org/linux/man-pages/man2/bind.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#chmod(kotlin.String,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [chmod(2)](http://man7.org/linux/man-pages/man2/chmod.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#chown(kotlin.String,%20kotlin.Int,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, uid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, gid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [chown(2)](http://man7.org/linux/man-pages/man2/chown.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#close(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [close(2)](http://man7.org/linux/man-pages/man2/close.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#connect(java.io.FileDescriptor,%20java.net.InetAddress,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, address: https://developer.android.com/reference/kotlin/java/net/InetAddress.html#!, port: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [connect(2)](http://man7.org/linux/man-pages/man2/connect.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#connect(java.io.FileDescriptor,%20java.net.SocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, address: https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#)` See [connect(2)](http://man7.org/linux/man-pages/man2/connect.2.html). | | static [StructDlInfo](https://developer.android.com/reference/kotlin/android/system/StructDlInfo)! | `https://developer.android.com/reference/kotlin/android/system/Os#dladdr(kotlin.Long)(addr: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [dladdr(3)](https://man7.org/linux/man-pages/man3/dladdr.3.html) | | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#dup(java.io.FileDescriptor)(oldFd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [dup(2)](http://man7.org/linux/man-pages/man2/dup.2.html). | | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#dup2(java.io.FileDescriptor,%20kotlin.Int)(oldFd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, newFd: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [dup2(2)](http://man7.org/linux/man-pages/man2/dup2.2.html). | | static [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)\<[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!\>! | `https://developer.android.com/reference/kotlin/android/system/Os#environ()()` See [environ(3)](http://man7.org/linux/man-pages/man3/environ.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#execv(kotlin.String,%20kotlin.Array)(filename: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, argv: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!)` See [exec(3)](https://man7.org/linux/man-pages/man3/execv.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#execve(kotlin.String,%20kotlin.Array,%20kotlin.Array)(filename: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, argv: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!, envp: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!)` See [execve(2)](http://man7.org/linux/man-pages/man2/execve.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#fchmod(java.io.FileDescriptor,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [fchmod(2)](http://man7.org/linux/man-pages/man2/fchmod.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#fchown(java.io.FileDescriptor,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, uid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, gid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [fchown(2)](http://man7.org/linux/man-pages/man2/fchown.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#fcntlInt(java.io.FileDescriptor,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, cmd: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, arg: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [fcntl(2)](http://man7.org/linux/man-pages/man2/fcntl.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#fdatasync(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [fdatasync(2)](http://man7.org/linux/man-pages/man2/fdatasync.2.html). | | static [StructStat](https://developer.android.com/reference/kotlin/android/system/StructStat)! | `https://developer.android.com/reference/kotlin/android/system/Os#fstat(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [fstat(2)](http://man7.org/linux/man-pages/man2/fstat.2.html). | | static [StructStatVfs](https://developer.android.com/reference/kotlin/android/system/StructStatVfs)! | `https://developer.android.com/reference/kotlin/android/system/Os#fstatvfs(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [fstatvfs(2)](http://man7.org/linux/man-pages/man2/fstatvfs.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#fsync(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [fsync(2)](http://man7.org/linux/man-pages/man2/fsync.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#ftruncate(java.io.FileDescriptor,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, length: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [ftruncate(2)](http://man7.org/linux/man-pages/man2/ftruncate.2.html). | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#gai_strerror(kotlin.Int)(error: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [gai_strerror(3)](http://man7.org/linux/man-pages/man3/gai_strerror.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#getegid()()` See [getegid(2)](http://man7.org/linux/man-pages/man2/getegid.2.html). | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#getenv(kotlin.String)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [getenv(3)](http://man7.org/linux/man-pages/man3/getenv.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#geteuid()()` See [geteuid(2)](http://man7.org/linux/man-pages/man2/geteuid.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#getgid()()` See [getgid(2)](http://man7.org/linux/man-pages/man2/getgid.2.html). | | static [SocketAddress](https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#getpeername(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [getpeername(2)](http://man7.org/linux/man-pages/man2/getpeername.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#getpid()()` See [getpid(2)](http://man7.org/linux/man-pages/man2/getpid.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#getppid()()` See [getppid(2)](http://man7.org/linux/man-pages/man2/getppid.2.html). | | static [SocketAddress](https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#getsockname(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [getsockname(2)](http://man7.org/linux/man-pages/man2/getsockname.2.html). | | static [StructTimeval](https://developer.android.com/reference/kotlin/android/system/StructTimeval) | `https://developer.android.com/reference/kotlin/android/system/Os#getsockoptTimeval(java.io.FileDescriptor,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, level: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, option: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [getsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#gettid()()` See [gettid(2)](http://man7.org/linux/man-pages/man2/gettid.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#getuid()()` See [getuid(2)](http://man7.org/linux/man-pages/man2/getuid.2.html). | | static [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#getxattr(kotlin.String,%20kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [getxattr(2)](http://man7.org/linux/man-pages/man2/getxattr.2.html) | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#if_indextoname(kotlin.Int)(index: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [if_indextoname(3)](http://man7.org/linux/man-pages/man3/if_indextoname.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#if_nametoindex(kotlin.String)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [if_nametoindex(3)](http://man7.org/linux/man-pages/man3/if_nametoindex.3.html). | | static [InetAddress](https://developer.android.com/reference/kotlin/java/net/InetAddress.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#inet_pton(kotlin.Int,%20kotlin.String)(family: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [inet_pton(3)](http://man7.org/linux/man-pages/man3/inet_pton.3.html). | | static [Boolean](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#isatty(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [isatty(3)](http://man7.org/linux/man-pages/man3/isatty.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#kill(kotlin.Int,%20kotlin.Int)(pid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, signal: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [kill(2)](http://man7.org/linux/man-pages/man2/kill.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#lchown(kotlin.String,%20kotlin.Int,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, uid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, gid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [lchown(2)](http://man7.org/linux/man-pages/man2/lchown.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#link(kotlin.String,%20kotlin.String)(oldPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, newPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [link(2)](http://man7.org/linux/man-pages/man2/link.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#listen(java.io.FileDescriptor,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, backlog: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [listen(2)](http://man7.org/linux/man-pages/man2/listen.2.html). | | static [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)\<[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!\>! | `https://developer.android.com/reference/kotlin/android/system/Os#listxattr(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [listxattr(2)](http://man7.org/linux/man-pages/man2/listxattr.2.html) | | static [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#lseek(java.io.FileDescriptor,%20kotlin.Long,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, whence: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [lseek(2)](http://man7.org/linux/man-pages/man2/lseek.2.html). | | static [StructStat](https://developer.android.com/reference/kotlin/android/system/StructStat)! | `https://developer.android.com/reference/kotlin/android/system/Os#lstat(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [lstat(2)](http://man7.org/linux/man-pages/man2/lstat.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#madvise(kotlin.Long,%20kotlin.Long,%20kotlin.Int)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, advice: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [madvise(2)](http://man7.org/linux/man-pages/man2/madvise.2.html). | | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#) | `https://developer.android.com/reference/kotlin/android/system/Os#memfd_create(kotlin.String,%20kotlin.Int)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [memfd_create(2)](http://man7.org/linux/man-pages/man2/memfd_create.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#mincore(kotlin.Long,%20kotlin.Long,%20kotlin.ByteArray)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, vector: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!)` See [mincore(2)](http://man7.org/linux/man-pages/man2/mincore.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#mkdir(kotlin.String,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [mkdir(2)](http://man7.org/linux/man-pages/man2/mkdir.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#mkfifo(kotlin.String,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [mkfifo(3)](http://man7.org/linux/man-pages/man3/mkfifo.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#mlock(kotlin.Long,%20kotlin.Long)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [mlock(2)](http://man7.org/linux/man-pages/man2/mlock.2.html). | | static [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#mmap(kotlin.Long,%20kotlin.Long,%20kotlin.Int,%20kotlin.Int,%20java.io.FileDescriptor,%20kotlin.Long)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, prot: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [mmap(2)](http://man7.org/linux/man-pages/man2/mmap.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#msync(kotlin.Long,%20kotlin.Long,%20kotlin.Int)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [msync(2)](http://man7.org/linux/man-pages/man2/msync.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#munlock(kotlin.Long,%20kotlin.Long)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [munlock(2)](http://man7.org/linux/man-pages/man2/munlock.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#munmap(kotlin.Long,%20kotlin.Long)(address: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [munmap(2)](http://man7.org/linux/man-pages/man2/munmap.2.html). | | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#open(kotlin.String,%20kotlin.Int,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, mode: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [open(2)](http://man7.org/linux/man-pages/man2/open.2.html). | | static [Array](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html)\<[FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)!\>! | `https://developer.android.com/reference/kotlin/android/system/Os#pipe()()` See [pipe(2)](http://man7.org/linux/man-pages/man2/pipe.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#poll(kotlin.Array,%20kotlin.Int)(fds: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!, timeoutMs: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [poll(2)](http://man7.org/linux/man-pages/man2/poll.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#posix_fallocate(java.io.FileDescriptor,%20kotlin.Long,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, length: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [posix_fallocate(3)](http://man7.org/linux/man-pages/man3/posix_fallocate.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#prctl(kotlin.Int,%20kotlin.Long,%20kotlin.Long,%20kotlin.Long,%20kotlin.Long)(option: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, arg2: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, arg3: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, arg4: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html, arg5: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [prctl(2)](http://man7.org/linux/man-pages/man2/prctl.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#pread(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [pread(2)](http://man7.org/linux/man-pages/man2/pread.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#pread(java.io.FileDescriptor,%20java.nio.ByteBuffer,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [pread(2)](http://man7.org/linux/man-pages/man2/pread.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#pwrite(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [pwrite(2)](http://man7.org/linux/man-pages/man2/pwrite.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#pwrite(java.io.FileDescriptor,%20java.nio.ByteBuffer,%20kotlin.Long)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!, offset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [pwrite(2)](http://man7.org/linux/man-pages/man2/pwrite.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#read(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [read(2)](http://man7.org/linux/man-pages/man2/read.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#read(java.io.FileDescriptor,%20java.nio.ByteBuffer)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!)` See [read(2)](http://man7.org/linux/man-pages/man2/read.2.html). | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#readlink(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [readlink(2)](http://man7.org/linux/man-pages/man2/readlink.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#readv(java.io.FileDescriptor,%20kotlin.Array,%20kotlin.IntArray,%20kotlin.IntArray)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffers: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!, offsets: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html!, byteCounts: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html!)` See [readv(2)](http://man7.org/linux/man-pages/man2/readv.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#recvfrom(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int,%20kotlin.Int,%20java.net.InetSocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, srcAddress: https://developer.android.com/reference/kotlin/java/net/InetSocketAddress.html#!)` See [recvfrom(2)](http://man7.org/linux/man-pages/man2/recvfrom.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#recvfrom(java.io.FileDescriptor,%20java.nio.ByteBuffer,%20kotlin.Int,%20java.net.InetSocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, srcAddress: https://developer.android.com/reference/kotlin/java/net/InetSocketAddress.html#!)` See [recvfrom(2)](http://man7.org/linux/man-pages/man2/recvfrom.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#recvmsg(java.io.FileDescriptor,%20android.system.StructMsghdr,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, msg: https://developer.android.com/reference/kotlin/android/system/StructMsghdr, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [recvmsg(2)](http://man7.org/linux/man-pages/man2/recvmsg.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#remove(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [remove(3)](http://man7.org/linux/man-pages/man3/remove.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#removexattr(kotlin.String,%20kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [removexattr(2)](http://man7.org/linux/man-pages/man2/removexattr.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#rename(kotlin.String,%20kotlin.String)(oldPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, newPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [rename(2)](http://man7.org/linux/man-pages/man2/rename.2.html). | | static [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sendfile(java.io.FileDescriptor,%20java.io.FileDescriptor,%20android.system.Int64Ref,%20kotlin.Long)(outFd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, inFd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, offset: https://developer.android.com/reference/kotlin/android/system/Int64Ref!, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html)` See [sendfile(2)](http://man7.org/linux/man-pages/man2/sendfile.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sendmsg(java.io.FileDescriptor,%20android.system.StructMsghdr,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, msg: https://developer.android.com/reference/kotlin/android/system/StructMsghdr, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [sendmsg(2)](http://man7.org/linux/man-pages/man2/sendmsg.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sendto(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int,%20kotlin.Int,%20java.net.InetAddress,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, inetAddress: https://developer.android.com/reference/kotlin/java/net/InetAddress.html#!, port: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sendto(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int,%20kotlin.Int,%20java.net.SocketAddress)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, address: https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#?)` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sendto(java.io.FileDescriptor,%20java.nio.ByteBuffer,%20kotlin.Int,%20java.net.InetAddress,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, inetAddress: https://developer.android.com/reference/kotlin/java/net/InetAddress.html#!, port: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setegid(kotlin.Int)(egid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [setegid(2)](http://man7.org/linux/man-pages/man2/setegid.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setenv(kotlin.String,%20kotlin.String,%20kotlin.Boolean)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, value: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, overwrite: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-boolean/index.html)` See [setenv(3)](http://man7.org/linux/man-pages/man3/setenv.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#seteuid(kotlin.Int)(euid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [seteuid(2)](http://man7.org/linux/man-pages/man2/seteuid.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setgid(kotlin.Int)(gid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [setgid(2)](http://man7.org/linux/man-pages/man2/setgid.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setsid()()` See [setsid(2)](http://man7.org/linux/man-pages/man2/setsid.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setsockoptInt(java.io.FileDescriptor,%20kotlin.Int,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, level: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, option: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, value: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [setsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setsockoptTimeval(java.io.FileDescriptor,%20kotlin.Int,%20kotlin.Int,%20android.system.StructTimeval)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#, level: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, option: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, value: https://developer.android.com/reference/kotlin/android/system/StructTimeval)` See [setsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setuid(kotlin.Int)(uid: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [setuid(2)](http://man7.org/linux/man-pages/man2/setuid.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#setxattr(kotlin.String,%20kotlin.String,%20kotlin.ByteArray,%20kotlin.Int)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, value: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, flags: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [setxattr(2)](http://man7.org/linux/man-pages/man2/setxattr.2.html) | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#shutdown(java.io.FileDescriptor,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, how: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [shutdown(2)](http://man7.org/linux/man-pages/man2/shutdown.2.html). | | static [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#)! | `https://developer.android.com/reference/kotlin/android/system/Os#socket(kotlin.Int,%20kotlin.Int,%20kotlin.Int)(domain: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, type: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, protocol: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [socket(2)](http://man7.org/linux/man-pages/man2/socket.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#socketpair(kotlin.Int,%20kotlin.Int,%20kotlin.Int,%20java.io.FileDescriptor,%20java.io.FileDescriptor)(domain: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, type: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, protocol: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, fd1: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, fd2: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [socketpair(2)](http://man7.org/linux/man-pages/man2/socketpair.2.html). | | static [StructStat](https://developer.android.com/reference/kotlin/android/system/StructStat)! | `https://developer.android.com/reference/kotlin/android/system/Os#stat(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [stat(2)](http://man7.org/linux/man-pages/man2/stat.2.html). | | static [StructStatVfs](https://developer.android.com/reference/kotlin/android/system/StructStatVfs)! | `https://developer.android.com/reference/kotlin/android/system/Os#statvfs(kotlin.String)(path: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [statvfs(2)](http://man7.org/linux/man-pages/man2/statvfs.2.html). | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#strerror(kotlin.Int)(errno: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [strerror(2)](http://man7.org/linux/man-pages/man3/strerror.3.html). | | static [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)! | `https://developer.android.com/reference/kotlin/android/system/Os#strsignal(kotlin.Int)(signal: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [strsignal(3)](http://man7.org/linux/man-pages/man3/strsignal.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#symlink(kotlin.String,%20kotlin.String)(oldPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!, newPath: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [symlink(2)](http://man7.org/linux/man-pages/man2/symlink.2.html). | | static [Long](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-long/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#sysconf(kotlin.Int)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [sysconf(3)](http://man7.org/linux/man-pages/man3/sysconf.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#tcdrain(java.io.FileDescriptor)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!)` See [tcdrain(3)](http://man7.org/linux/man-pages/man3/tcdrain.3.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#tcsendbreak(java.io.FileDescriptor,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, duration: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [tcsendbreak(3)](http://man7.org/linux/man-pages/man3/tcsendbreak.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#umask(kotlin.Int)(mask: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [umask(2)](http://man7.org/linux/man-pages/man2/umask.2.html). | | static [StructUtsname](https://developer.android.com/reference/kotlin/android/system/StructUtsname)! | `https://developer.android.com/reference/kotlin/android/system/Os#uname()()` See [uname(2)](http://man7.org/linux/man-pages/man2/uname.2.html). | | static [Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#unsetenv(kotlin.String)(name: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html!)` See [unsetenv(3)](http://man7.org/linux/man-pages/man3/unsetenv.3.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#write(java.io.FileDescriptor,%20kotlin.ByteArray,%20kotlin.Int,%20kotlin.Int)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, bytes: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html!, byteOffset: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html, byteCount: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)` See [write(2)](http://man7.org/linux/man-pages/man2/write.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#write(java.io.FileDescriptor,%20java.nio.ByteBuffer)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffer: https://developer.android.com/reference/kotlin/java/nio/ByteBuffer.html#!)` See [write(2)](http://man7.org/linux/man-pages/man2/write.2.html). | | static [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html) | `https://developer.android.com/reference/kotlin/android/system/Os#writev(java.io.FileDescriptor,%20kotlin.Array,%20kotlin.IntArray,%20kotlin.IntArray)(fd: https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#!, buffers: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-array/index.html!, offsets: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html!, byteCounts: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html!)` See [writev(2)](http://man7.org/linux/man-pages/man2/writev.2.html). | ## Public methods ### accept Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun accept(     fd: FileDescriptor!,     peerAddress: InetSocketAddress! ): FileDescriptor! ``` See [accept(2)](http://man7.org/linux/man-pages/man2/accept.2.html). ### access Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun access(     path: String!,     mode: Int ): Boolean ``` See [access(2)](http://man7.org/linux/man-pages/man2/access.2.html). ### bind Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun bind(     fd: FileDescriptor!,     address: InetAddress!,     port: Int ): Unit ``` See [bind(2)](http://man7.org/linux/man-pages/man2/bind.2.html). ### bind Added in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun bind(     fd: FileDescriptor,     address: SocketAddress ): Unit ``` See [bind(2)](http://man7.org/linux/man-pages/man2/bind.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `address` | [SocketAddress](https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#): This value cannot be `null`. | ### chmod Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun chmod(     path: String!,     mode: Int ): Unit ``` See [chmod(2)](http://man7.org/linux/man-pages/man2/chmod.2.html). ### chown Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun chown(     path: String!,     uid: Int,     gid: Int ): Unit ``` See [chown(2)](http://man7.org/linux/man-pages/man2/chown.2.html). ### close Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun close(fd: FileDescriptor!): Unit ``` See [close(2)](http://man7.org/linux/man-pages/man2/close.2.html). ### connect Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun connect(     fd: FileDescriptor!,     address: InetAddress!,     port: Int ): Unit ``` See [connect(2)](http://man7.org/linux/man-pages/man2/connect.2.html). ### connect Added in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun connect(     fd: FileDescriptor,     address: SocketAddress ): Unit ``` See [connect(2)](http://man7.org/linux/man-pages/man2/connect.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `address` | [SocketAddress](https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#): This value cannot be `null`. | ### dladdr Added in [API level 36.1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun dladdr(addr: Long): StructDlInfo! ``` See [dladdr(3)](https://man7.org/linux/man-pages/man3/dladdr.3.html) | Return || |---|---| | `https://developer.android.com/reference/kotlin/android/system/StructDlInfo!` | null if the underlying native `dladdr` call fails. | ### dup Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun dup(oldFd: FileDescriptor!): FileDescriptor! ``` See [dup(2)](http://man7.org/linux/man-pages/man2/dup.2.html). ### dup2 Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun dup2(     oldFd: FileDescriptor!,     newFd: Int ): FileDescriptor! ``` See [dup2(2)](http://man7.org/linux/man-pages/man2/dup2.2.html). ### environ Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun environ(): Array! ``` See [environ(3)](http://man7.org/linux/man-pages/man3/environ.3.html). ### execv Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun execv(     filename: String!,     argv: Array! ): Unit ``` See [exec(3)](https://man7.org/linux/man-pages/man3/execv.3.html). ### execve Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun execve(     filename: String!,     argv: Array!,     envp: Array! ): Unit ``` See [execve(2)](http://man7.org/linux/man-pages/man2/execve.2.html). ### fchmod Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fchmod(     fd: FileDescriptor!,     mode: Int ): Unit ``` See [fchmod(2)](http://man7.org/linux/man-pages/man2/fchmod.2.html). ### fchown Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fchown(     fd: FileDescriptor!,     uid: Int,     gid: Int ): Unit ``` See [fchown(2)](http://man7.org/linux/man-pages/man2/fchown.2.html). ### fcntlInt Added in [API level 30](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fcntlInt(     fd: FileDescriptor,     cmd: Int,     arg: Int ): Int ``` See [fcntl(2)](http://man7.org/linux/man-pages/man2/fcntl.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | ### fdatasync Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fdatasync(fd: FileDescriptor!): Unit ``` See [fdatasync(2)](http://man7.org/linux/man-pages/man2/fdatasync.2.html). ### fstat Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fstat(fd: FileDescriptor!): StructStat! ``` See [fstat(2)](http://man7.org/linux/man-pages/man2/fstat.2.html). ### fstatvfs Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fstatvfs(fd: FileDescriptor!): StructStatVfs! ``` See [fstatvfs(2)](http://man7.org/linux/man-pages/man2/fstatvfs.2.html). ### fsync Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun fsync(fd: FileDescriptor!): Unit ``` See [fsync(2)](http://man7.org/linux/man-pages/man2/fsync.2.html). ### ftruncate Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun ftruncate(     fd: FileDescriptor!,     length: Long ): Unit ``` See [ftruncate(2)](http://man7.org/linux/man-pages/man2/ftruncate.2.html). ### gai_strerror Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun gai_strerror(error: Int): String! ``` See [gai_strerror(3)](http://man7.org/linux/man-pages/man3/gai_strerror.3.html). ### getegid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getegid(): Int ``` See [getegid(2)](http://man7.org/linux/man-pages/man2/getegid.2.html). ### getenv Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getenv(name: String!): String! ``` See [getenv(3)](http://man7.org/linux/man-pages/man3/getenv.3.html). ### geteuid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun geteuid(): Int ``` See [geteuid(2)](http://man7.org/linux/man-pages/man2/geteuid.2.html). ### getgid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getgid(): Int ``` See [getgid(2)](http://man7.org/linux/man-pages/man2/getgid.2.html). ### getpeername Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getpeername(fd: FileDescriptor!): SocketAddress! ``` See [getpeername(2)](http://man7.org/linux/man-pages/man2/getpeername.2.html). ### getpid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getpid(): Int ``` See [getpid(2)](http://man7.org/linux/man-pages/man2/getpid.2.html). ### getppid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getppid(): Int ``` See [getppid(2)](http://man7.org/linux/man-pages/man2/getppid.2.html). ### getsockname Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getsockname(fd: FileDescriptor!): SocketAddress! ``` See [getsockname(2)](http://man7.org/linux/man-pages/man2/getsockname.2.html). ### getsockoptTimeval Added in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getsockoptTimeval(     fd: FileDescriptor,     level: Int,     option: Int ): StructTimeval ``` See [getsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). Only for use with `option` values that return a `struct timeval` such as `https://developer.android.com/reference/kotlin/android/system/OsConstants#SO_RCVTIMEO:kotlin.Int` and `https://developer.android.com/reference/kotlin/android/system/OsConstants#SO_SNDTIMEO:kotlin.Int`. Use with other options may throw an `IllegalArgumentException` or return junk values. | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | Return || |---|---| | `https://developer.android.com/reference/kotlin/android/system/StructTimeval` | This value cannot be `null`. | ### gettid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun gettid(): Int ``` See [gettid(2)](http://man7.org/linux/man-pages/man2/gettid.2.html). ### getuid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getuid(): Int ``` See [getuid(2)](http://man7.org/linux/man-pages/man2/getuid.2.html). ### getxattr Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun getxattr(     path: String!,     name: String! ): ByteArray! ``` See [getxattr(2)](http://man7.org/linux/man-pages/man2/getxattr.2.html) ### if_indextoname Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun if_indextoname(index: Int): String! ``` See [if_indextoname(3)](http://man7.org/linux/man-pages/man3/if_indextoname.3.html). ### if_nametoindex Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun if_nametoindex(name: String!): Int ``` See [if_nametoindex(3)](http://man7.org/linux/man-pages/man3/if_nametoindex.3.html). ### inet_pton Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun inet_pton(     family: Int,     address: String! ): InetAddress! ``` See [inet_pton(3)](http://man7.org/linux/man-pages/man3/inet_pton.3.html). ### isatty Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun isatty(fd: FileDescriptor!): Boolean ``` See [isatty(3)](http://man7.org/linux/man-pages/man3/isatty.3.html). ### kill Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun kill(     pid: Int,     signal: Int ): Unit ``` See [kill(2)](http://man7.org/linux/man-pages/man2/kill.2.html). ### lchown Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun lchown(     path: String!,     uid: Int,     gid: Int ): Unit ``` See [lchown(2)](http://man7.org/linux/man-pages/man2/lchown.2.html). ### link Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun link(     oldPath: String!,     newPath: String! ): Unit ``` See [link(2)](http://man7.org/linux/man-pages/man2/link.2.html). ### listen Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun listen(     fd: FileDescriptor!,     backlog: Int ): Unit ``` See [listen(2)](http://man7.org/linux/man-pages/man2/listen.2.html). ### listxattr Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun listxattr(path: String!): Array! ``` See [listxattr(2)](http://man7.org/linux/man-pages/man2/listxattr.2.html) ### lseek Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun lseek(     fd: FileDescriptor!,     offset: Long,     whence: Int ): Long ``` See [lseek(2)](http://man7.org/linux/man-pages/man2/lseek.2.html). ### lstat Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun lstat(path: String!): StructStat! ``` See [lstat(2)](http://man7.org/linux/man-pages/man2/lstat.2.html). ### madvise Added in [API level 37.1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun madvise(     address: Long,     byteCount: Long,     advice: Int ): Unit ``` See [madvise(2)](http://man7.org/linux/man-pages/man2/madvise.2.html). ### memfd_create Added in [API level 30](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun memfd_create(     name: String,     flags: Int ): FileDescriptor ``` See [memfd_create(2)](http://man7.org/linux/man-pages/man2/memfd_create.2.html). | Parameters || |---|---| | `name` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html): This value cannot be `null`. | | Return || |---|---| | `https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#` | This value cannot be `null`. | ### mincore Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun mincore(     address: Long,     byteCount: Long,     vector: ByteArray! ): Unit ``` See [mincore(2)](http://man7.org/linux/man-pages/man2/mincore.2.html). ### mkdir Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun mkdir(     path: String!,     mode: Int ): Unit ``` See [mkdir(2)](http://man7.org/linux/man-pages/man2/mkdir.2.html). ### mkfifo Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun mkfifo(     path: String!,     mode: Int ): Unit ``` See [mkfifo(3)](http://man7.org/linux/man-pages/man3/mkfifo.3.html). ### mlock Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun mlock(     address: Long,     byteCount: Long ): Unit ``` See [mlock(2)](http://man7.org/linux/man-pages/man2/mlock.2.html). ### mmap Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun mmap(     address: Long,     byteCount: Long,     prot: Int,     flags: Int,     fd: FileDescriptor!,     offset: Long ): Long ``` See [mmap(2)](http://man7.org/linux/man-pages/man2/mmap.2.html). ### msync Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun msync(     address: Long,     byteCount: Long,     flags: Int ): Unit ``` See [msync(2)](http://man7.org/linux/man-pages/man2/msync.2.html). ### munlock Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun munlock(     address: Long,     byteCount: Long ): Unit ``` See [munlock(2)](http://man7.org/linux/man-pages/man2/munlock.2.html). ### munmap Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun munmap(     address: Long,     byteCount: Long ): Unit ``` See [munmap(2)](http://man7.org/linux/man-pages/man2/munmap.2.html). ### open Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun open(     path: String!,     flags: Int,     mode: Int ): FileDescriptor! ``` See [open(2)](http://man7.org/linux/man-pages/man2/open.2.html). ### pipe Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun pipe(): Array! ``` See [pipe(2)](http://man7.org/linux/man-pages/man2/pipe.2.html). ### poll Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun poll(     fds: Array!,     timeoutMs: Int ): Int ``` See [poll(2)](http://man7.org/linux/man-pages/man2/poll.2.html). Note that in Lollipop this could throw an `ErrnoException` with `EINTR`. In later releases, the implementation will automatically just restart the system call with an appropriately reduced timeout. ### posix_fallocate Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun posix_fallocate(     fd: FileDescriptor!,     offset: Long,     length: Long ): Unit ``` See [posix_fallocate(3)](http://man7.org/linux/man-pages/man3/posix_fallocate.3.html). ### prctl Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun prctl(     option: Int,     arg2: Long,     arg3: Long,     arg4: Long,     arg5: Long ): Int ``` See [prctl(2)](http://man7.org/linux/man-pages/man2/prctl.2.html). ### pread Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun pread(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int,     offset: Long ): Int ``` See [pread(2)](http://man7.org/linux/man-pages/man2/pread.2.html). ### pread Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun pread(     fd: FileDescriptor!,     buffer: ByteBuffer!,     offset: Long ): Int ``` See [pread(2)](http://man7.org/linux/man-pages/man2/pread.2.html). ### pwrite Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun pwrite(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int,     offset: Long ): Int ``` See [pwrite(2)](http://man7.org/linux/man-pages/man2/pwrite.2.html). ### pwrite Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun pwrite(     fd: FileDescriptor!,     buffer: ByteBuffer!,     offset: Long ): Int ``` See [pwrite(2)](http://man7.org/linux/man-pages/man2/pwrite.2.html). ### read Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun read(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int ): Int ``` See [read(2)](http://man7.org/linux/man-pages/man2/read.2.html). ### read Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun read(     fd: FileDescriptor!,     buffer: ByteBuffer! ): Int ``` See [read(2)](http://man7.org/linux/man-pages/man2/read.2.html). ### readlink Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun readlink(path: String!): String! ``` See [readlink(2)](http://man7.org/linux/man-pages/man2/readlink.2.html). ### readv Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun readv(     fd: FileDescriptor!,     buffers: Array!,     offsets: IntArray!,     byteCounts: IntArray! ): Int ``` See [readv(2)](http://man7.org/linux/man-pages/man2/readv.2.html). ### recvfrom Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun recvfrom(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int,     flags: Int,     srcAddress: InetSocketAddress! ): Int ``` See [recvfrom(2)](http://man7.org/linux/man-pages/man2/recvfrom.2.html). ### recvfrom Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun recvfrom(     fd: FileDescriptor!,     buffer: ByteBuffer!,     flags: Int,     srcAddress: InetSocketAddress! ): Int ``` See [recvfrom(2)](http://man7.org/linux/man-pages/man2/recvfrom.2.html). ### recvmsg Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun recvmsg(     fd: FileDescriptor,     msg: StructMsghdr,     flags: Int ): Int ``` See [recvmsg(2)](http://man7.org/linux/man-pages/man2/recvmsg.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `msg` | [StructMsghdr](https://developer.android.com/reference/kotlin/android/system/StructMsghdr): This value cannot be `null`. | ### remove Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun remove(path: String!): Unit ``` See [remove(3)](http://man7.org/linux/man-pages/man3/remove.3.html). ### removexattr Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun removexattr(     path: String!,     name: String! ): Unit ``` See [removexattr(2)](http://man7.org/linux/man-pages/man2/removexattr.2.html). ### rename Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun rename(     oldPath: String!,     newPath: String! ): Unit ``` See [rename(2)](http://man7.org/linux/man-pages/man2/rename.2.html). ### sendfile Added in [API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sendfile(     outFd: FileDescriptor!,     inFd: FileDescriptor!,     offset: Int64Ref!,     byteCount: Long ): Long ``` See [sendfile(2)](http://man7.org/linux/man-pages/man2/sendfile.2.html). ### sendmsg Added in [API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sendmsg(     fd: FileDescriptor,     msg: StructMsghdr,     flags: Int ): Int ``` See [sendmsg(2)](http://man7.org/linux/man-pages/man2/sendmsg.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `msg` | [StructMsghdr](https://developer.android.com/reference/kotlin/android/system/StructMsghdr): This value cannot be `null`. | ### sendto Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sendto(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int,     flags: Int,     inetAddress: InetAddress!,     port: Int ): Int ``` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). ### sendto Added in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sendto(     fd: FileDescriptor,     bytes: ByteArray,     byteOffset: Int,     byteCount: Int,     flags: Int,     address: SocketAddress? ): Int ``` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `bytes` | [ByteArray](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-byte-array/index.html): This value cannot be `null`. | | `address` | [SocketAddress](https://developer.android.com/reference/kotlin/java/net/SocketAddress.html#)?: This value may be `null`. | ### sendto Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sendto(     fd: FileDescriptor!,     buffer: ByteBuffer!,     flags: Int,     inetAddress: InetAddress!,     port: Int ): Int ``` See [sendto(2)](http://man7.org/linux/man-pages/man2/sendto.2.html). ### setegid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) Deprecated in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setegid(egid: Int): Unit ``` **Deprecated:** *Android Applications do not have sufficient privileges to call this method.* See [setegid(2)](http://man7.org/linux/man-pages/man2/setegid.2.html). ### setenv Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setenv(     name: String!,     value: String!,     overwrite: Boolean ): Unit ``` See [setenv(3)](http://man7.org/linux/man-pages/man3/setenv.3.html). ### seteuid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) Deprecated in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun seteuid(euid: Int): Unit ``` **Deprecated:** *Android Applications do not have sufficient privileges to call this method.* See [seteuid(2)](http://man7.org/linux/man-pages/man2/seteuid.2.html). ### setgid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) Deprecated in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setgid(gid: Int): Unit ``` **Deprecated:** *Android Applications do not have sufficient privileges to call this method.* See [setgid(2)](http://man7.org/linux/man-pages/man2/setgid.2.html). ### setsid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setsid(): Int ``` See [setsid(2)](http://man7.org/linux/man-pages/man2/setsid.2.html). ### setsockoptInt Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setsockoptInt(     fd: FileDescriptor!,     level: Int,     option: Int,     value: Int ): Unit ``` See [setsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). ### setsockoptTimeval Added in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setsockoptTimeval(     fd: FileDescriptor,     level: Int,     option: Int,     value: StructTimeval ): Unit ``` See [setsockopt(2)](http://man7.org/linux/man-pages/man2/setsockopt.2.html). Only for use with `option` values that take a `struct timeval` such as `https://developer.android.com/reference/kotlin/android/system/OsConstants#SO_RCVTIMEO:kotlin.Int` and `https://developer.android.com/reference/kotlin/android/system/OsConstants#SO_SNDTIMEO:kotlin.Int`. Use with other options is likely to cause incorrect behavior. | Parameters || |---|---| | `fd` | [FileDescriptor](https://developer.android.com/reference/kotlin/java/io/FileDescriptor.html#): This value cannot be `null`. | | `value` | [StructTimeval](https://developer.android.com/reference/kotlin/android/system/StructTimeval): This value cannot be `null`. | ### setuid Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) Deprecated in [API level 29](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setuid(uid: Int): Unit ``` **Deprecated:** *Android Applications do not have sufficient privileges to call this method.* See [setuid(2)](http://man7.org/linux/man-pages/man2/setuid.2.html). ### setxattr Added in [API level 26](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun setxattr(     path: String!,     name: String!,     value: ByteArray!,     flags: Int ): Unit ``` See [setxattr(2)](http://man7.org/linux/man-pages/man2/setxattr.2.html) ### shutdown Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun shutdown(     fd: FileDescriptor!,     how: Int ): Unit ``` See [shutdown(2)](http://man7.org/linux/man-pages/man2/shutdown.2.html). ### socket Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun socket(     domain: Int,     type: Int,     protocol: Int ): FileDescriptor! ``` See [socket(2)](http://man7.org/linux/man-pages/man2/socket.2.html). ### socketpair Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun socketpair(     domain: Int,     type: Int,     protocol: Int,     fd1: FileDescriptor!,     fd2: FileDescriptor! ): Unit ``` See [socketpair(2)](http://man7.org/linux/man-pages/man2/socketpair.2.html). ### stat Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun stat(path: String!): StructStat! ``` See [stat(2)](http://man7.org/linux/man-pages/man2/stat.2.html). ### statvfs Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun statvfs(path: String!): StructStatVfs! ``` See [statvfs(2)](http://man7.org/linux/man-pages/man2/statvfs.2.html). ### strerror Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun strerror(errno: Int): String! ``` See [strerror(2)](http://man7.org/linux/man-pages/man3/strerror.3.html). ### strsignal Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun strsignal(signal: Int): String! ``` See [strsignal(3)](http://man7.org/linux/man-pages/man3/strsignal.3.html). ### symlink Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun symlink(     oldPath: String!,     newPath: String! ): Unit ``` See [symlink(2)](http://man7.org/linux/man-pages/man2/symlink.2.html). ### sysconf Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun sysconf(name: Int): Long ``` See [sysconf(3)](http://man7.org/linux/man-pages/man3/sysconf.3.html). ### tcdrain Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun tcdrain(fd: FileDescriptor!): Unit ``` See [tcdrain(3)](http://man7.org/linux/man-pages/man3/tcdrain.3.html). ### tcsendbreak Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun tcsendbreak(     fd: FileDescriptor!,     duration: Int ): Unit ``` See [tcsendbreak(3)](http://man7.org/linux/man-pages/man3/tcsendbreak.3.html). ### umask Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun umask(mask: Int): Int ``` See [umask(2)](http://man7.org/linux/man-pages/man2/umask.2.html). ### uname Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun uname(): StructUtsname! ``` See [uname(2)](http://man7.org/linux/man-pages/man2/uname.2.html). ### unsetenv Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun unsetenv(name: String!): Unit ``` See [unsetenv(3)](http://man7.org/linux/man-pages/man3/unsetenv.3.html). ### write Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun write(     fd: FileDescriptor!,     bytes: ByteArray!,     byteOffset: Int,     byteCount: Int ): Int ``` See [write(2)](http://man7.org/linux/man-pages/man2/write.2.html). ### write Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun write(     fd: FileDescriptor!,     buffer: ByteBuffer! ): Int ``` See [write(2)](http://man7.org/linux/man-pages/man2/write.2.html). ### writev Added in [API level 21](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` static fun writev(     fd: FileDescriptor!,     buffers: Array!,     offsets: IntArray!,     byteCounts: IntArray! ): Int ``` See [writev(2)](http://man7.org/linux/man-pages/man2/writev.2.html).