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() system call 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() system calls are always successful, and no return value is
     reserved to indicate an error.

SEE ALSO

     getuid(2), issetugid(2), setgid(2), setregid(2)

STANDARDS

     The getgid() and getegid() system calls are expected to conform to ISO/IEC 9945-1:1990
     (“POSIX.1”).

HISTORY

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