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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | ERRORS | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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getgid(2) System Calls Manual getgid(2)
getgid, getegid - get group identity
Standard C library (libc, -lc)
#include <unistd.h>
gid_t getgid(void);
gid_t getegid(void);
getgid() returns the real group ID of the calling process.
getegid() returns the effective group ID of the calling process.
These functions are always successful and never modify errno.
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.
POSIX.1-2008.
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.
getresgid(2), setgid(2), setregid(2), credentials(7)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨Linux man-pages 6.15 2025-05-17 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)
