1.\" Copyright (c) 1983, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)setuid.3 6.4 (Berkeley) 4/19/91 33.\" 34.Dd April 19, 1991 35.Dt SETUID 3 36.Os BSD 4.2 37.Sh NAME 38.Nm setuid , 39.Nm seteuid , 40.Nm setruid , 41.Nm setgid , 42.Nm setegid , 43.Nm setrgid 44.Nd set user and group ID 45.Sh SYNOPSIS 46.Fd #include <sys/types.h> 47.Ft int 48.Fn setuid "uid_t uid" 49.Ft int 50.Fn seteuid "uid_t euid" 51.Ft int 52.Fn setruid "uid_t ruid" 53.Ft int 54.Fn setgid "gid_t gid" 55.Ft int 56.Fn setegid "gid_t egid" 57.Ft int 58.Fn setrgid "gid_t rgid" 59.Sh DESCRIPTION 60The 61.Fn setuid 62function 63.Pq Fn setgid 64sets both the real and effective 65user ID (group ID) of the current process 66as specified. 67.Pp 68The 69.Fn seteuid 70function 71.Pq Fn setegid 72sets the effective user ID (group ID) of the 73current process. 74.Pp 75The 76.Fn setruid 77function 78.Pq Fn setrgid 79sets the real user ID (group ID) of the 80current process. 81.Sh RETURN VALUES 82Upon success, these functions return 0; 83otherwise \-1 is returned. 84.Pp 85If the user is not the super user, or the uid 86specified is not the real or effective ID, these 87functions return \-1. 88.Sh SEE ALSO 89.Xr setreuid 2 , 90.Xr setregid 2 , 91.Xr getuid 2 , 92.Xr getgid 2 93.Sh HISTORY 94A 95.Fn setuid 96and 97.Fn setgid 98syscall appeared in 99.At v6 . 100