getegid man page on OpenBSD

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GETGID(2)		  OpenBSD Programmer's Manual		     GETGID(2)

NAME
     getgid, getegid - get group process identification

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

     gid_t
     getgid(void);

     gid_t
     getegid(void);

DESCRIPTION
     The getgid() function returns the real group ID of the calling process
     and the getegid() function returns the effective group ID of the calling
     process.

     The real group ID is specified at login time.

     The real group ID is the group of the user who invoked the program.  As
     the effective group ID gives the process additional permissions during
     the execution of ``set-group-ID'' mode processes, getgid() is used to
     determine the real group ID of the calling process.

ERRORS
     The getgid() and getegid() functions are always successful, and no return
     value is reserved to indicate an error.

SEE ALSO
     getgroups(2), getresgid(2), getuid(2), setgid(2), setregid(2)

STANDARDS
     The getgid() and getegid() functions conform to IEEE Std 1003.1-1988
     (``POSIX'').

OpenBSD 4.9			August 4, 2008			   OpenBSD 4.9
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