NAME
getgid, getegid
— get group process
identification
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/types.h>
#include <unistd.h>
gid_t
getgid(void);
gid_t
getegid(void);
DESCRIPTION
Thegetgid()
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-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
STANDARDS
The getgid() and
getegid() function calls are expected to conform to
IEEE Std 1003.1-1990 (“POSIX.1”).