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

6       getgid, getegid - get group process identification
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SYNOPSIS

9       #include <sys/types.h>
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11       gid_t
12       getgid()
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14       gid_t
15       getegid()
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DESCRIPTION

18       The  getgid  function returns the real group ID of the calling process,
19       getegid returns the effective group ID of the calling process.
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21       The real group ID is specified at login time.
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23       The real group ID is the group of the user who invoked the program.  As
24       the  effective group ID gives the process additional permissions during
25       the execution of ``set-group-ID'' mode processes,  getgid  is  used  to
26       determine the real-user-id of the calling process.
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ERRORS

29       The  getgid  and getegid functions are always successful, and no return
30       value is reserved to indicate an error.
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SEE ALSO

33       getuid(2), setregid(2), setgid(3)
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STANDARDS

36       Getgid and getegid conform to IEEE Std 1003.1-1988 (``POSIX'').
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404.2 Berkeley Distribution      December 2, 1997                      GETGID(2)