added in API level 21

android.system

Classes

Int64Ref A signed 64bit integer reference suitable for passing to lower-level system calls. 
Os Access to low-level system functionality. 
OsConstants Constants and helper functions for use with Os
StructPollfd Used as an in/out parameter to Os.poll(StructPollfd[], int)
StructStat File information returned by Os.fstat(FileDescriptor), Os.lstat(String), and Os.stat(String)
StructStatVfs File information returned by Os.fstatvfs(FileDescriptor) and Os.statvfs(String)
StructTimespec Corresponds to C's struct timespec from <time.h>
StructUtsname Information returned by Os.uname()

Exceptions

ErrnoException A checked exception thrown when Os methods fail.