mirror of https://github.com/mkerrisk/man-pages
100 lines
3.4 KiB
Groff
100 lines
3.4 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.\" manual page may be incorrect or out-of-date.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@gmail.com>
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.TH SETRESUID 2 2007-07-26 "Linux" "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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.BR setresuid ()
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sets the real user ID, the effective user ID, and the
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saved set-user-ID of the current process.
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Unprivileged user processes
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may change the real UID,
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effective UID, and saved set-user-ID, each to one of:
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the current real UID, the current effective UID or the
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current saved set-user-ID.
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Privileged processes (on Linux, those having the \fBCAP_SETUID\fP capability)
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may set the real UID, effective UID, and
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saved set-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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Regardless of what changes are made to the real UID, effective UID,
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and saved set-user-ID, the file system UID is always set to the same
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value as the (possibly new) effective UID.
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Completely analogously,
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.BR setresgid ()
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sets the real GID, effective GID, and saved set-group-ID
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of the current process (and always modifies the file system GID
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to be the same as the effective GID),
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with the same restrictions for non-privileged processes.
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.SH "RETURN VALUE"
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On success, zero is returned.
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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 user ID over its
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.BR RLIMIT_NPROC
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resource limit.
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.TP
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.B EPERM
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The calling process is not privileged (did not have the \fBCAP_SETUID\fP
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capability) and tried to change the IDs to values that are not permitted.
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.SH VERSIONS
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These calls are available under Linux since Linux 2.1.44.
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.SH "CONFORMING TO"
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These calls are non-standard;
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they also appear on HP-UX and some of the BSDs.
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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 provided by glibc since version 2.3.2.
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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 setfsuid (2),
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.BR setfsgid (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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.BR credentials (7),
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.BR feature_test_macros (7)
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