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SETREUID
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
Return to Main Contents
PROLOG
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
NAME
setreuid - set real and effective user IDs
SYNOPSIS
#include <unistd.h>
int setreuid(uid_t ruid, uid_t euid);
DESCRIPTION
The setreuid() function shall set the real and effective user
IDs of the current process to the values specified by the
ruid and euid arguments. If ruid or euid is
-1, the corresponding effective or real user ID of the
current process shall be left unchanged.
A process with appropriate privileges can set either ID to any value.
An unprivileged process can only set the effective user ID
if the euid argument is equal to either the real, effective,
or saved user ID of the process.
It is unspecified whether a process without appropriate privileges
is permitted to change the real user ID to match the current
real, effective, or saved set-user-ID of the process.
RETURN VALUE
Upon successful completion, 0 shall be returned. Otherwise, -1 shall
be returned and errno set to indicate the error.
ERRORS
The setreuid() function shall fail if:
- EINVAL
-
The value of the ruid or euid argument is invalid or out-of-range.
- EPERM
-
The current process does not have appropriate privileges, and either
an attempt was made to change the effective user ID to a
value other than the real user ID or the saved set-user-ID or an attempt
was made to change the real user ID to a value not
permitted by the implementation.
The following sections are informative.
EXAMPLES
Setting the Effective User ID to the Real User ID
The following example sets the effective user ID of the calling process
to the real user ID, so that files created later will be
owned by the current user.
-
#include <unistd.h>
#include <sys/types.h>
...
setreuid(getuid(), getuid());
...
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
getegid(), geteuid(), getgid(), getuid(),
setegid(), seteuid(), setgid(), setregid(),
setuid(), the Base Definitions volume of
IEEE Std 1003.1-2001, <unistd.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- Setting the Effective User ID to the Real User ID
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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