112 lines
3.3 KiB
Groff
112 lines
3.3 KiB
Groff
.\" 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. 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
|
|
.\" 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.
|
|
.\"
|
|
.\" @(#)strerror.3 6.9 (Berkeley) 6/29/91
|
|
.\"
|
|
.Dd June 29, 1991
|
|
.Dt STRERROR 3
|
|
.Os BSD 4
|
|
.Sh NAME
|
|
.Nm perror ,
|
|
.Nm strerror ,
|
|
.Nm sys_errlist ,
|
|
.Nm sys_nerr
|
|
.Nd system error messages
|
|
.Sh SYNOPSIS
|
|
.Vt extern int errno;
|
|
.Vt extern char *sys_errlist[];
|
|
.Fd #include <stdio.h>
|
|
.Ft void
|
|
.Fn perror "const char *string"
|
|
.Ft char *
|
|
.Fn strerror "int errnum"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn strerror
|
|
and
|
|
.Fn perror
|
|
functions lookup the error message string affiliated with an
|
|
error number.
|
|
.Pp
|
|
The
|
|
.Fn sterror
|
|
function accepts an error number argument
|
|
.Fa errnum
|
|
and
|
|
returns a pointer to the corresponding
|
|
message string.
|
|
.Pp
|
|
The
|
|
.Fn perror
|
|
function finds the error message corresponding to the current
|
|
value of the global variable
|
|
.Va errno
|
|
and writes it, followed by a new-line, to the
|
|
.Em stderr .
|
|
If the argument
|
|
.Fa string
|
|
is
|
|
.Pf non- Dv NULL
|
|
it is pre-appended to the message
|
|
string and separated from it by
|
|
a colon and space
|
|
.Pq Ql \&:\ \& .
|
|
If
|
|
.Fa string
|
|
is
|
|
.Dv NULL
|
|
only the error message string is printed.
|
|
.Pp
|
|
The message strings can be accessed directly using the external
|
|
character array
|
|
.Fa sys_errlist .
|
|
The external value
|
|
.Fa sys_nerr
|
|
contains a count of the messages in
|
|
.Fa sys_errlist .
|
|
The use of these variables is deprecated;
|
|
.Fn strerror
|
|
should be used instead.
|
|
.Sh SEE ALSO
|
|
.Xr intro 2 ,
|
|
.Xr psignal 3
|
|
.Sh HISTORY
|
|
The
|
|
.Fn strerror
|
|
and
|
|
.Fn perror
|
|
functions are
|
|
.Ud .
|