1993-10-07 22:27:50 +03:00
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.\" Copyright (c) 1980, 1991 Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)strerror.3 6.9 (Berkeley) 6/29/91
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1994-01-11 03:05:54 +03:00
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.\" $Id: perror.3,v 1.2 1994/01/11 00:06:29 jtc Exp $
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1993-10-07 22:27:50 +03:00
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.\"
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.Dd June 29, 1991
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.Dt PERROR 3
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.Os BSD 4
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.Sh NAME
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.Nm perror
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.Nd write error messages to standard error
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.Sh SYNOPSIS
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.Fd #include <stdio.h>
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.Ft void
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.Fn perror "const char *string"
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.Sh DESCRIPTION
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The
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.Fn perror
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1994-01-11 03:05:54 +03:00
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function looks up the language-dependent error message string affiliated
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1993-10-07 22:27:50 +03:00
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with an error number and writes it, followed by a new-line, to the
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standard error stream.
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.Pp
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If the argument
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.Fa string
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is
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.Pf non- Dv NULL
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it is prepended to the message string and separated from it by
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a colon and a space
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.Pq Ql \&:\ \& .
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If
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.Fa string
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is
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.Dv NULL
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only the error message string is printed.
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.Pp
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The contents of the error message string is the same as those returned by
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.Fn strerror
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with argument
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.Fa errno .
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.Sh SEE ALSO
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.Xr intro 2 ,
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.Xr psignal 3 ,
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.Xr setlocale 3 ,
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.Xr strerror 3 ,
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.Sh STANDARDS
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The
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.Fn perror
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function conforms to
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.St -ansiC .
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