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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "SETREUID" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" setreuid 
+.SH NAME
+setreuid \- set real and effective user IDs
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int setreuid(uid_t\fP \fIruid\fP\fB, uid_t\fP \fIeuid\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIsetreuid\fP() function shall set the real and effective user
+IDs of the current process to the values specified by the
+\fIruid\fP and \fIeuid\fP arguments. If \fIruid\fP or \fIeuid\fP is
+-1, the corresponding effective or real user ID of the
+current process shall be left unchanged.
+.LP
+A process with appropriate privileges can set either ID to any value.
+An unprivileged process can only set the effective user ID
+if the \fIeuid\fP argument is equal to either the real, effective,
+or saved user ID of the process.
+.LP
+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.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 shall be returned. Otherwise, -1 shall
+be returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fIsetreuid\fP() function shall fail if:
+.TP 7
+.B EINVAL
+The value of the \fIruid\fP or \fIeuid\fP argument is invalid or out-of-range.
+.TP 7
+.B 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.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.SS Setting the Effective User ID to the Real User ID
+.LP
+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.
+.sp
+.RS
+.nf
+
+\fB#include <unistd.h>
+#include <sys/types.h>
+\&...
+setreuid(getuid(), getuid());
+\&...
+\fP
+.fi
+.RE
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIgetegid\fP() , \fIgeteuid\fP() , \fIgetgid\fP() , \fIgetuid\fP()
+, \fIsetegid\fP() , \fIseteuid\fP() , \fIsetgid\fP() , \fIsetregid\fP()
+, \fIsetuid\fP() , the Base Definitions volume of
+IEEE\ Std\ 1003.1-2001, \fI<unistd.h>\fP
+.SH 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 .