getgid(2)

1getgid(2)                     System Calls Manual                    getgid(2)
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NAME

6       getgid, getegid - get group identity
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LIBRARY

9       Standard C library (libc, -lc)
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SYNOPSIS

12       #include <unistd.h>
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14       gid_t getgid(void);
15       gid_t getegid(void);
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DESCRIPTION

18       getgid() returns the real group ID of the calling process.
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20       getegid() returns the effective group ID of the calling process.
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ERRORS

23       These functions are always successful and never modify errno.
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VERSIONS

26       On  Alpha,  instead of a pair of getgid() and getegid() system calls, a
27       single getxgid() system call is provided, which returns a pair of  real
28       and effective GIDs.  The glibc getgid() and getegid() wrapper functions
29       transparently deal with this.  See  syscall(2)  for  details  regarding
30       register mapping.
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STANDARDS

33       POSIX.1-2008.
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HISTORY

36       POSIX.1-2001, 4.3BSD.
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38       The  original  Linux getgid() and getegid() system calls supported only
39       16-bit group IDs.  Subsequently, Linux 2.4 added getgid32()  and  gete‐
40       gid32(), supporting 32-bit IDs.  The glibc getgid() and getegid() wrap‐
41       per functions transparently deal with the variations across kernel ver‐
42       sions.
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