Name
getgid, getegid - get group identityLibrary
Standard C library ( libc ", " -lc )Synopsis
#include <unistd.h> gid_t getgid(void); gid_t getegid(void);
Description
getgid() returns the real group ID of the calling process.getegid() returns the effective group ID of the calling process.
Errors
These functions are always successful and never modifyerrno
. Versions
On Alpha, instead of a pair of getgid() and getegid() system calls, a single getxgid() system call is provided, which returns a pair of real and effective GIDs. The glibc getgid() and getegid() wrapper functions transparently deal with this. See syscall(2) for details regarding register mapping.Standards
POSIX.1-2008.History
POSIX.1-2001, 4.3BSD.The original Linux getgid() and getegid() system calls supported only 16-bit group IDs. Subsequently, Linux 2.4 added getgid32() and getegid32() supporting 32-bit IDs. The glibc getgid() and getegid() wrapper functions transparently deal with the variations across kernel versions.
See Also
- getresgid(2),
- setgid(2),
- setregid(2),
- credentials(7)