getgid(2) — Linux manual page


getgid(2)                  System Calls Manual                 getgid(2)

NAME         top

       getgid, getegid - get group identity

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <unistd.h>

       gid_t getgid(void);
       gid_t getegid(void);

DESCRIPTION         top

       getgid() returns the real group ID of the calling process.

       getegid() returns the effective group ID of the calling process.

ERRORS         top

       These functions are always successful and never modify errno.

VERSIONS         top

       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         top


HISTORY         top

       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         top

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

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                      getgid(2)

Pages that refer to this page: groups(1@@shadow-utils)ps(1)strace(1)getgroups(2)setgid(2)setreuid(2)syscalls(2)group_member(3)id_t(3type)credentials(7)signal-safety(7)user_namespaces(7)