NAME
getgid, getegid
— get group process
identification
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 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 1003.1-2008 (“POSIX.1”).
HISTORY
The getgid() system call first appeared in
Version 4 AT&T UNIX, and
getegid() in Version 7
AT&T UNIX.