NetBSD/lib/libc/stdio/perror.3

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.\" 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
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.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
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.\" 3. All advertising materials mentioning features or use of this software
.\" 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
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" from: @(#)strerror.3 6.9 (Berkeley) 6/29/91
.\" $Id: perror.3,v 1.2 1994/01/11 00:06:29 jtc Exp $
.\"
.Dd June 29, 1991
.Dt PERROR 3
.Os BSD 4
.Sh NAME
.Nm perror
.Nd write error messages to standard error
.Sh SYNOPSIS
.Fd #include <stdio.h>
.Ft void
.Fn perror "const char *string"
.Sh DESCRIPTION
The
.Fn perror
function looks up the language-dependent 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
.Pf non- Dv NULL
it is prepended to the message string and separated from it by
a colon and a space
.Pq Ql \&:\ \& .
If
.Fa string
is
.Dv NULL
only the error message string is printed.
.Pp
The contents of the error message string is 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 .