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NetBSD 6.1.5 - man page for getgid (netbsd section 2)

GETGID(2)			     BSD System Calls Manual				GETGID(2)

NAME
     getgid, getegid -- get group process identification

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

     gid_t
     getgid(void);

     gid_t
     getegid(void);

DESCRIPTION
     The getgid() function returns the real group ID of the calling process, getegid() 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
     getuid(2), setgid(2), setgroups(2), setregid(2)

STANDARDS
     getgid() and getegid() conform to ISO/IEC 9945-1:1990 (``POSIX.1'').

HISTORY
     The getgid() function appeared in Version 4 AT&T UNIX.

BSD					  April 3, 2010 				      BSD


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