.\" Hey Emacs! This file is -*- nroff -*- source. .\" .\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl) .\" .\" Permission is granted to make and distribute verbatim copies of this .\" manual provided the copyright notice and this permission notice are .\" preserved on all copies. .\" .\" Permission is granted to copy and distribute modified versions of this .\" manual under the conditions for verbatim copying, provided that the .\" entire resulting derived work is distributed under the terms of a .\" permission notice identical to this one .\" .\" Since the Linux kernel and libraries are constantly changing, this .\" manual page may be incorrect or out-of-date. The author(s) assume no .\" responsibility for errors or omissions, or for damages resulting from .\" the use of the information contained herein. The author(s) may not .\" have taken the same level of care in the production of this manual, .\" which is licensed free of charge, as they might when working .\" professionally. .\" .\" Formatted or processed versions of this manual, if unaccompanied by .\" the source, must acknowledge the copyright and authors of this work. .\" .TH SETRESUID 2 "16 July 1997" "Linux 2.1.44" "Linux Programmer's Manual" .SH NAME setresuid, setresgid \- set real, effective and saved user or group ID .SH SYNOPSIS .B #include .sp .BI "int setresuid(uid_t " ruid ", uid_t " euid ", uid_t " suid ); .br .BI "int setresgid(gid_t " rgid ", gid_t " egid ", gid_t " sgid ); .SH DESCRIPTION .B setresuid (introduced in Linux 2.1.44) sets the real, effective and saved user ID's of the current process. Unprivileged user processes (i.e., processes with each of real, effective and saved user ID nonzero) may change the real, effective and saved user ID, each to one of: the current uid, the current effective uid or the current saved uid. The super-user may set real, effective and saved user ID to arbitrary values. If one of the parameters equals \-1, the corresponding value is not changed. Completely analogously, .B setresgid sets the real, effective and saved group ID's of the current process, with the same restrictions for processes with each of real, effective and saved user ID nonzero. .SH "RETURN VALUE" On success, zero is returned. On error, \-1 is returned, and .I errno is set appropriately. .SH ERRORS .TP .B EPERM The current process was not privileged and tried to change the IDs is a not allowed way. .SH "CONFORMING TO" This call is Linux-specific. .SH "SEE ALSO" .BR getuid (2), .BR setuid (2), .BR getreuid (2), .BR setreuid (2), .BR getresuid (2)