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.Dd February 7, 2015 21.Dt SETRESUID 2 22.Os 23.Sh NAME 24.Nm getresgid , 25.Nm getresuid , 26.Nm setresgid , 27.Nm setresuid 28.Nd "get or set real, effective and saved user or group ID" 29.Sh LIBRARY 30.Lb libc 31.Sh SYNOPSIS 32.In sys/types.h 33.In unistd.h 34.Ft int 35.Fn getresgid "gid_t *rgid" "gid_t *egid" "gid_t *sgid" 36.Ft int 37.Fn getresuid "uid_t *ruid" "uid_t *euid" "uid_t *suid" 38.Ft int 39.Fn setresgid "gid_t rgid" "gid_t egid" "gid_t sgid" 40.Ft int 41.Fn setresuid "uid_t ruid" "uid_t euid" "uid_t suid" 42.Sh DESCRIPTION 43The 44.Fn setresuid 45system call sets the real, 46effective and saved user IDs of the current process. 47The analogous 48.Fn setresgid 49sets the real, effective and saved group IDs. 50.Pp 51Privileged processes may set these IDs 52to arbitrary values. 53Unprivileged processes are restricted 54in that each of the new IDs must match one of the current IDs. 55.Pp 56Passing -1 as an argument causes the corresponding value 57to remain unchanged. 58.Pp 59The 60.Fn getresgid 61and 62.Fn getresuid 63calls retrieve the real, effective, and saved group and user IDs of 64the current process, respectively. 65.Sh RETURN VALUES 66.Rv -std 67.Sh ERRORS 68.Bl -tag -width Er 69.It Bq Er EPERM 70The calling process was not privileged 71and tried to change one or more IDs to a value 72which was not the current real ID, the current effective ID 73nor the current saved ID. 74.It Bq Er EFAULT 75An address passed to 76.Fn getresgid 77or 78.Fn getresuid 79was invalid. 80.El 81.Sh SEE ALSO 82.Xr getegid 2 , 83.Xr geteuid 2 , 84.Xr getgid 2 , 85.Xr getuid 2 , 86.Xr issetugid 2 , 87.Xr setgid 2 , 88.Xr setregid 2 , 89.Xr setreuid 2 , 90.Xr setuid 2 91.Sh HISTORY 92These functions first appeared in HP-UX. 93