getgid(2) [opendarwin man page]

GETGID(2)						      BSD System Calls 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, 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 dur-
     ing the execution of ``set-group-ID'' mode processes, getgid() is used to determine the real-user-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), setregid(2), setgid(3)

STANDARDS

     Getgid() and getegid() conform to IEEE Std 1003.1-1988 (``POSIX.1'').

4.2 Berkeley Distribution					   June 4, 1993 					 4.2 Berkeley Distribution

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 dur-
     ing 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