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.

Debian                                             May 1, 2020                                         GETGID(2)