English pages are provided only to compare translations to original pages,
better looking pages can be browsed
at the Linux man-pages official site.
Linux Programmer's Manual (2)
setresuid, setresgid - set real, effective and saved user or group ID
/* See feature_test_macros
int setresuid(uid_t ruid, uid_t euid, uid_t suid);
int setresgid(gid_t rgid, gid_t egid, gid_t sgid);
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.
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
is set appropriately.
does not match the current UID and this call would
bring that user ID over its
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.
These calls are available under Linux since Linux 2.1.44.
These calls are nonstandard;
they also appear on HP-UX and some of the BSDs.
Under HP-UX and FreeBSD, the prototype is found in
Under Linux the prototype is provided by glibc since version 2.3.2.
The original Linux
system calls supported only 16-bit user and group IDs.
Subsequently, Linux 2.4 added
supporting 32-bit IDs.
wrapper functions transparently deal with the variations across kernel versions.
This page is part of release 3.66 of the Linux
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
- RETURN VALUE
- CONFORMING TO
- SEE ALSO
This document was created by
using the manual pages.
Time: 21:42:58 GMT, July 12, 2014