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setresuid, setresgid — set real, effective and saved user or group ID
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <unistd.h>
int
setresuid( |
uid_t ruid, |
| uid_t euid, | |
uid_t suid); |
int
setresgid( |
gid_t rgid, |
| gid_t egid, | |
gid_t sgid); |
setresuid() sets the real
user ID, the effective user ID, and the saved set-user-ID of
the calling process.
Unprivileged user processes may change the real UID, effective UID, and saved set-user-ID, each to one of: the current real UID, the current effective UID or the current saved set-user-ID.
Privileged processes (on Linux, those having the
CAP_SETUID capability) may set
the real UID, effective UID, and saved set-user-ID to
arbitrary values.
If one of the arguments equals −1, the corresponding value is not changed.
Regardless of what changes are made to the real UID, effective UID, and saved set-user-ID, the filesystem UID is always set to the same value as the (possibly new) effective UID.
Completely analogously, setresgid() sets the real GID, effective
GID, and saved set-group-ID of the calling process (and
always modifies the filesystem GID to be the same as the
effective GID), with the same restrictions for unprivileged
processes.
On success, zero is returned. On error, −1 is
returned, and errno is set
appropriately.
uid does
not match the current UID and this call would bring
that user ID over its RLIMIT_NPROC resource limit.
The calling process is not privileged (did not have
the CAP_SETUID
capability) and tried to change the IDs to values that
are not permitted.
Under HP-UX and FreeBSD, the prototype is found in
<unistd.h>
Under Linux the prototype is provided by glibc since version
2.3.2.
The original Linux setresuid() and setresgid() system calls supported only
16-bit user and group IDs. Subsequently, Linux 2.4 added
setresuid32() and setresgid32(), supporting 32-bit IDs. The
glibc setresuid() and
setresgid() wrapper functions
transparently deal with the variations across kernel
versions.
getresuid(2), getuid(2), setfsgid(2), setfsuid(2), setreuid(2), setuid(2), capabilities(7), credentials(7)
This page is part of release 3.54 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man−pages/.
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Copyright (C) 1997 Andries Brouwer (aebcwi.nl) %%%LICENSE_START(VERBATIM) 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. %%%LICENSE_END Modified, 2003-05-26, Michael Kerrisk, <mtk.manpagesgmail.com> |