getgid(2)                                               System Calls Manual                                               getgid(2)

NAME
       getgid, getegid - get group identity

LIBRARY
       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 modify errno.

STANDARDS
       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 get‐
       gid32() 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 re‐
       turns 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 man-pages 6.03                                         2022-10-30                                                   getgid(2)