Manpages - getgid.2

getgid, getegid - get group identity

  #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.

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.

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.

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

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