getegid(2) — Linux manual page


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

NAME         top

       getgid, getegid - get group identity

SYNOPSIS         top

       #include <unistd.h>
       #include <sys/types.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.

CONFORMING TO         top

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

NOTES         top

       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         top

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

COLOPHON         top

       This page is part of release 5.09 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                            2019-03-06                        GETGID(2)

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