setresuid() - Unix, Linux System Call
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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 current 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 parameters 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 current process (and always modifies the file system GID
to be the same as the effective GID),
with the same restrictions for non-privileged processes.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and
errno is set appropriately.
ERRORS
Tag | Description |
EAGAIN |
uid does not match the current UID and this call would
bring that user ID over its NPROC rlimit.
|
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.
|
CONFORMING TO
These calls are non-standard;
they also appear on HP-UX and some of the BSDs.
HISTORY
This system call was first introduced in HP-UX.
It is available under Linux since Linux 2.1.44.
These days it is also found in FreeBSD (for emulation of Linux binaries).
NOTES
Under HP-UX and FreeBSD the prototype is found in
<unistd.h>. Under Linux the prototype is given by glibc since version 2.3.2
provided _GNU_SOURCE is defined.
SEE ALSO
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