mirror of https://github.com/mkerrisk/man-pages
88 lines
3.1 KiB
Groff
88 lines
3.1 KiB
Groff
.\" Hey Emacs! This file is -*- nroff -*- source.
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.\"
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.\" Copyright (C) 1997 Andries Brouwer (aeb@cwi.nl)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" Modified, 2003-05-26, Michael Kerrisk, <mtk-manpages@gmx.net>
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.TH SETRESUID 2 2003-05-26 "Linux 2.4" "Linux Programmer's Manual"
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.SH NAME
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setresuid, setresgid \- set real, effective and saved user or group ID
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.SH SYNOPSIS
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.B #define _GNU_SOURCE
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.br
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.B #include <unistd.h>
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.sp
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.BI "int setresuid(uid_t " ruid ", uid_t " euid ", uid_t " suid );
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.br
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.BI "int setresgid(gid_t " rgid ", gid_t " egid ", gid_t " sgid );
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.SH DESCRIPTION
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.B setresuid
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sets the real user ID, the effective user ID, and the saved
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(effective) user ID of the current process.
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Unprivileged user processes (i.e., processes with each of
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real, effective and saved user ID nonzero) may change the real,
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effective and saved user ID, each to one of:
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the current uid, the current effective uid or the current saved uid.
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The superuser may set real, effective and saved user ID to arbitrary values.
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If one of the parameters equals \-1, the corresponding value is not changed.
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Completely analogously,
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.B setresgid
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sets the real, effective and saved group ID's of the current process,
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with the same restrictions for processes with each of
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real, effective and saved user ID nonzero.
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.SH "RETURN VALUE"
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On success, zero is returned. On error, \-1 is returned, and
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.I errno
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is set appropriately.
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.SH ERRORS
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.TP
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.B EAGAIN
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.I uid
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does not match the current uid and this call would
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bring that userID over its NPROC rlimit.
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.TP
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.B EPERM
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The current process was not privileged (did not have the CAP_SETUID
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capability) and tried to change the IDs is a not allowed way.
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.SH "CONFORMING TO"
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This call is nonstandard.
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.SH HISTORY
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This system call was first introduced in HP-UX.
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It is available under Linux since Linux 2.1.44.
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These days it is also found in FreeBSD (for emulation of Linux binaries).
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.SH NOTES
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Under HP-UX and FreeBSD the prototype is found in
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.IR <unistd.h> .
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Under Linux the prototype is given by glibc since version 2.3.2
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provided _GNU_SOURCE is defined.
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.SH "SEE ALSO"
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.BR getresuid (2),
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.BR getuid (2),
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.BR setreuid (2),
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.BR setuid (2),
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.BR capabilities (7)
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