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GETGID(2)                                                               Linux Programmer's Manual                                                              GETGID(2)

NAME
       getgid, getegid - get group identity

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 modify errno.

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, 4.3BSD.

NOTES
       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.

       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.

SEE ALSO
       getresgid(2), setgid(2), setregid(2), credentials(7)

Linux                                                                          2021-03-22                                                                      GETGID(2)