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+.\" Copyright (c) 1990, 1991 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:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. 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
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)ctermid.3	5.2 (Berkeley) 4/19/91
+.\"	$NetBSD: cuserid.3,v 1.13 2010/03/22 21:55:39 joerg Exp $
+.\"
+.Dd November 28, 1993
+.Dt CUSERID 3
+.Os
+.Sh NAME
+.Nm cuserid
+.Nd get user name
+.Sh LIBRARY
+.Lb libcompat
+.Sh SYNOPSIS
+.In stdio.h
+.Ft char *
+.Fn cuserid "char *buf"
+.Sh DESCRIPTION
+.Bf -symbolic
+This interface is available from the compatibility library, libcompat and
+has been obsoleted by
+.Xr getlogin 2 .
+.Ef
+.Pp
+The
+.Fn cuserid
+function returns a character string representation of the user name
+associated with the effective user ID of the calling process.
+.Pp
+If
+.Fa buf
+is not the
+.Dv NULL
+pointer, the user name is copied into the memory referenced by
+.Fa buf .
+The argument
+.Fa buf
+is assumed to point to an array at least
+.Dv L_cuserid
+(as defined in the include
+file
+.In stdio.h )
+bytes long.
+Otherwise, the user name is copied to a static buffer.
+.Sh RETURN VALUES
+If
+.Fa buf
+is not the
+.Dv NULL
+pointer,
+.Fa buf
+is returned;
+otherwise the address of the static buffer is returned.
+.Pp
+If the user name could not be determined, if
+.Fa buf
+is not the
+.Dv NULL
+pointer, the null character
+.Sq \e0
+will be stored at
+.Fa *buf ;
+otherwise
+the
+.Dv NULL
+pointer is returned.
+.Sh SEE ALSO
+.Xr getlogin 2 ,
+.Xr getpwent 3
+.Sh STANDARDS
+The
+.Fn cuserid
+function conforms to
+.St -p1003.1-88 .
+.Sh BUGS
+Due to irreconcilable differences in historic implementations,
+.Fn cuserid
+was removed from the
+.St -p1003.1-90
+standard.
+This implementation exists purely for compatibility with existing programs.
+New programs should use one of the following three alternatives to
+obtain the user name:
+.Pp
+.Bl -enum -offset indent -compact
+.It
+.Fn getlogin
+to return the user's login name.
+.It
+.Nm getpwuid Ns Pq Fn geteuid
+to return the user name associated with the calling process' effective user ID.
+.It
+.Nm getpwuid Ns Pq Fn getuid
+to return the user name associated with the calling process' real user ID.
+.El