1.\" Copyright (c) 2000 2.\" Sheldon Hearn. 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.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES 19.\" 20.\" $FreeBSD: src/lib/libc/sys/setresuid.2,v 1.2.2.8 2001/12/14 18:34:01 ru Exp $ 21.\" 22.Dd August 3, 2007 23.Dt SETRESUID 2 24.Os 25.Sh NAME 26.Nm getresgid , 27.Nm getresuid , 28.Nm setresgid , 29.Nm setresuid 30.Nd get or set real, effective and saved user or group ID 31.Sh LIBRARY 32.Lb libc 33.Sh SYNOPSIS 34.In sys/types.h 35.In unistd.h 36.Ft int 37.Fn getresgid "gid_t *rgid" "gid_t *egid" "gid_t *sgid" 38.Ft int 39.Fn getresuid "uid_t *ruid" "uid_t *euid" "uid_t *suid" 40.Ft int 41.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid" 42.Ft int 43.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid" 44.Sh DESCRIPTION 45The 46.Fn setresuid 47system call sets the real, 48effective and saved user IDs of the current process. 49The analogous 50.Fn setresgid 51sets the real, effective and saved group IDs. 52.Pp 53Privileged processes may set these IDs 54to arbitrary values. 55Unprivileged processes are restricted 56in that each of the new IDs must match one of the current IDs. 57.Pp 58Passing -1 as an argument causes the corresponding value 59to remain unchanged. 60.Pp 61The 62.Fn getresgid 63and 64.Fn getresuid 65calls retrieve the real, effective, and saved group and user IDs of 66the current process, respectively. 67.Sh RETURN VALUES 68.Rv -std 69.Sh ERRORS 70.Bl -tag -width Er 71.It Bq Er EFAULT 72An address passed to 73.Fn getresgid 74or 75.Fn getresuid 76was invalid. 77.It Bq Er EPERM 78The calling process was not privileged 79and tried to change one or more IDs to a value 80which was not the current real ID, the current effective ID 81nor the current saved ID. 82.El 83.Sh SEE ALSO 84.Xr getegid 2 , 85.Xr geteuid 2 , 86.Xr getgid 2 , 87.Xr getuid 2 , 88.Xr issetugid 2 , 89.Xr setgid 2 , 90.Xr setregid 2 , 91.Xr setreuid 2 , 92.Xr setuid 2 93.Sh HISTORY 94These system calls first appeared in HP-UX. 95