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.\" $DragonFly: src/lib/libc/sys/setresuid.2,v 1.2 2003/06/17 04:26:47 dillon Exp $ 22.\" 23.Dd January 17, 2000 24.Dt SETRESUID 2 25.Os 26.Sh NAME 27.Nm setresgid , 28.Nm setresuid 29.Nd set real, effective and saved user or group ID 30.Sh LIBRARY 31.Lb libc 32.Sh SYNOPSIS 33.In sys/types.h 34.In unistd.h 35.Ft int 36.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid" 37.Ft int 38.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid" 39.Sh DESCRIPTION 40The 41.Fn setresuid 42system call sets the real, 43effective and saved user IDs of the current process. 44The analogous 45.Fn setresgid 46sets the real, effective and saved group IDs. 47.Pp 48Privileged processes may set these IDs 49to arbitrary values. 50Unprivileged processes are restricted 51in that each of the new IDs must match one of the current IDs. 52.Pp 53Passing -1 as an argument causes the corresponding value 54to remain unchanged. 55.Sh RETURN VALUES 56.Rv -std 57.Sh ERRORS 58.Bl -tag -width Er 59.It Bq Er EPERM 60The calling process was not privileged 61and tried to change one or more IDs to a value 62which was not the current real ID, the current effective ID 63nor the current saved ID. 64.El 65.Sh SEE ALSO 66.Xr getegid 2 , 67.Xr geteuid 2 , 68.Xr getgid 2 , 69.Xr getuid 2 , 70.Xr issetugid 2 , 71.Xr setgid 2 , 72.Xr setregid 2 , 73.Xr setreuid 2 , 74.Xr setuid 2 75.Sh STANDARDS 76These system calls are not available on many platforms. 77They exist in 78.Fx 79to support Linux binaries linked against GNU libc2. 80.Sh HISTORY 81These system calls first appeared in HP-UX. 82