SETRESUID
Section: Linux Programmer's Manual (2)
Updated: 2007-07-26
NAME
setresuid, setresgid - set real, effective and saved user or group ID
SYNOPSIS
#define _GNU_SOURCE
#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);
DESCRIPTION
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 file system 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 file system GID
to be the same as the effective GID),
with the same restrictions for unprivileged processes.
RETURN VALUE
On success, zero is returned.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- EAGAIN
-
uid
does not match the current UID and this call would
bring that user ID over its
RLIMIT_NPROC
resource limit.
- EPERM
-
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.
VERSIONS
These calls are available under Linux since Linux 2.1.44.
CONFORMING TO
These calls are nonstandard;
they also appear on HP-UX and some of the BSDs.
NOTES
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.
SEE ALSO
getresuid(2),
getuid(2),
setfsgid(2),
setfsuid(2),
setreuid(2),
setuid(2),
capabilities(7),
credentials(7),
feature_test_macros(7)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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Time: 07:34:54 GMT, March 26, 2013