1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)setuid.2 6.6 (Berkeley) 02/03/93 7.\" 8.Dd 9.Dt SETUID 2 10.Os BSD 4.2 11.Sh NAME 12.Nm setuid , 13.Nm seteuid , 14.Nm setgid , 15.Nm setegid , 16.Nd set user and group ID 17.Sh SYNOPSIS 18.Fd #include <sys/types.h> 19.Fd #include <unistd.h> 20.Ft int 21.Fn setuid "uid_t uid" 22.Ft int 23.Fn seteuid "uid_t euid" 24.Ft int 25.Fn setgid "gid_t gid" 26.Ft int 27.Fn setegid "gid_t egid" 28.Sh DESCRIPTION 29The 30.Fn setuid 31function 32.Pq Fn setgid 33sets both the real and effective 34user ID (group ID) of the current process 35as specified. 36.Pp 37The 38.Fn seteuid 39function 40.Pq Fn setegid 41sets the effective user ID (group ID) of the 42current process. 43.Pp 44.Sh RETURN VALUES 45Upon success, these functions return 0; 46otherwise \-1 is returned. 47.Pp 48If the user is not the super user, or the uid 49specified is not the real, effective ID, or saved ID, 50these functions return \-1. 51.Sh SEE ALSO 52.Xr getuid 2 , 53.Xr getgid 2 54.Sh HISTORY 55A 56.Fn setuid 57and 58.Fn setgid 59syscall appeared in 60.At v6 . 61