getgid man page

getgid, getegid ā€” get group identity


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

Conforming to

POSIX.1-2001, POSIX.1-2008, 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

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


This page is part of release 4.16 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

Referenced By

credentials(7), gawk(1), getgroups(2), group_member(3), mksh(1), procenv(1), procps(1), ps(1), setgid(2), setreuid(2), signal-safety(7), strace(1), syscalls(2), user_namespaces(7).

The man pages getegid(2) and getgid32(2) are aliases of getgid(2).

2017-09-15 Linux Programmer's Manual