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138 lines
4.0 KiB
Groff
138 lines
4.0 KiB
Groff
.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. 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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.\" @(#)strerror.3 8.1 (Berkeley) 6/9/93
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.\"
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.TH STRERROR 3 "22 December 1997" GNO "Library Routines"
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.SH NAME
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.BR perror ,
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.BR strerror ,
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.BR sys_errlist ,
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.BR sys_nerr ,
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.BR _errnoText
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\- system error messages
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.SH SYNOPSIS
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#include <stdio.h>
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.sp 1
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void
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\fBperror\fR(const char *\fIstring\fR);
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.sp 1
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extern const char * const \fBsys_errlist\fR[];
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.br
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extern const int \fBsys_nerr\fR;
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.sp 1
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#include <string.h>
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.sp 1
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char *
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\fBstrerror\fR(int \fIerrnum\fR);
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.SH DESCRIPTION
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The
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.BR strerror
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and
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.BR perror
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functions look up the error message string corresponding to an
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error number.
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.LP
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The
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.BR strerror
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function accepts an error number argument
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.I errnum
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and
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returns a pointer to the corresponding
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message string.
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.LP
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The
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.BR perror
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function finds the error message corresponding to the current
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value of the global variable
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.IR errno
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(see
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.BR intro (2))
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and writes it, followed by a newline, to the
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standard error file descriptor.
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If the argument
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.I string
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is non-NULL,
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it is prepended to the message
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string and separated from it by
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a colon and space.
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If
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.I string
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is
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.BR NULL ,
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only the error message string is printed.
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.LP
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If
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.I errnum
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is not a recognized error number,
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the error message string will contain
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.BR "unknown error:" ,
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followed by the error number in decimal.
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.LP
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The message strings can be accessed directly using the external
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array
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.IR sys_errlist .
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The external value
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.IR sys_nerr
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contains a count of the messages in
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.IR sys_errlist .
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For backwards compatibility with older versions of GNO,
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.BR sys_errlist
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can also be referenced through the variable
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.BR _errnoText ,
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which has identical type.
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The use of these variables is deprecated;
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.BR strerror
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should be used instead.
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.SH SEE ALSO
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.BR intro (2),
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.BR psignal (3)
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.SH HISTORY
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The
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.BR strerror
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and
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.BR perror
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functions first appeared in 4.4BSD.
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.SH BUGS
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For unknown error numbers, the
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.BR strerror
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function will return its result in a static buffer which
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may be overwritten by subsequent calls.
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.LP
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Programs that use the deprecated
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.IR sys_errlist
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variable often fail to compile because they declare it
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inconsistently.
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