getgid(2) - Linux manual page (original) (raw)

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](../man3/errno.3.html)_.

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)](../man2/syscall.2.html)
   for details regarding register mapping.

STANDARDS top

   POSIX.1-2008.

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)](../man2/getresgid.2.html), [setgid(2)](../man2/setgid.2.html), [setregid(2)](../man2/setregid.2.html), [credentials(7)](../man7/credentials.7.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 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)