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+.\"	$OpenBSD: perror.3,v 1.11 2019/05/16 13:35:16 schwarze Exp $
+.\"
+.\" Copyright (c) 1980, 1991 Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" 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.
+.\"
+.Dd $Mdocdate: May 16 2019 $
+.Dt PERROR 3
+.Os
+.Sh NAME
+.Nm perror
+.Nd write error messages to standard error
+.Sh SYNOPSIS
+.In stdio.h
+.Ft void
+.Fn perror "const char *string"
+.Sh DESCRIPTION
+The
+.Fn perror
+function looks up the error message string affiliated
+with an error number and writes it, followed by a new-line, to the
+standard error stream.
+.Pp
+If the argument
+.Fa string
+is not the
+.Dv NULL
+pointer and is not zero length, it is prepended to the message string and
+separated from it by a colon and a space
+.Pq Ql \&:\ \& .
+Otherwise, only the error message string is printed.
+.Pp
+The contents of the error message string are the same as those returned by
+.Fn strerror
+with argument
+.Fa errno .
+.Sh SEE ALSO
+.Xr intro 2 ,
+.Xr psignal 3 ,
+.Xr setlocale 3 ,
+.Xr strerror 3
+.Sh STANDARDS
+The
+.Fn perror
+function conforms to
+.St -ansiC .
+.Sh HISTORY
+The
+.Fn perror
+function first appeared in
+.At v4 .
+.Sh CAVEATS
+On systems other than
+.Ox ,
+the
+.Dv LC_MESSAGES
+.Xr locale 1
+category can cause different strings to be printed instead of the
+normal error messages; see CAVEATS in
+.Xr setlocale 3
+for details.