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
IEEE Std 1003.1-1990 (“POSIX.1”).
HISTORY
The
getgid() function appeared in
Version 4 AT&T UNIX.