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.\" Copyright (c) 1980, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" SUCH DAMAGE.
.\"
.\"     @(#)getuid.2	8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt GETUID 2
.Os BSD 4
.Sh NAME
.Nm getuid ,
.Nm geteuid
.Nd get user identification
.Sh SYNOPSIS
.Fd #include <unistd.h>
.Fd #include <sys/types.h>
.Ft uid_t
.Fn getuid void
.Ft uid_t
.Fn geteuid void
.Sh DESCRIPTION
The
.Fn getuid
function returns the real user ID of the calling process.
The
.Fn geteuid
function
returns the effective user ID of the calling process.
.Pp
The real user ID is that of the user who has invoked the program.
As the effective user ID
gives the process additional permissions during
execution of
.Dq Em set-user-ID
mode processes,
.Fn getuid
is used to determine the real-user-id of the calling process.
.Sh ERRORS
The
.Fn getuid
and
.Fn geteuid
functions are always successful, and no return value is reserved to
indicate an error.
.Sh SEE ALSO
.Xr getgid 2 ,
.Xr setreuid 2
.Sh STANDARDS
.Fn Geteuid
and
.Fn getuid
conform to IEEE Std 1003.1-1988
.Pq Dq Tn POSIX .
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