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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The 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	8.1 (Berkeley) 6/9/93
-.\"
-.Dd June 9, 1993
-.Dt STRERROR 3
-.Os BSD 4
-.Sh NAME
-.Nm perror ,
-.Nm strerror ,
-.Nm sys_errlist ,
-.Nm sys_nerr
-.Nd system error messages
-.Sh SYNOPSIS
-.Fd #include <stdio.h>
-.Ft void
-.Fn perror "const char *string"
-.Vt extern const char * const sys_errlist[];
-.Vt extern const int sys_nerr;
-.Fd #include <string.h>
-.Ft char *
-.Fn strerror "int errnum"
-.Sh DESCRIPTION
-The
-.Fn strerror
-and
-.Fn perror
-functions look up the error message string corresponding to an
-error number.
-.Pp
-The
-.Fn strerror
-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
-.Pq Xr intro 2
-and writes it, followed by a newline, to the
-standard error file descriptor.
-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 space
-.Pq Ql \&:\ \& .
-If
-.Fa string
-is
-.Dv NULL ,
-only the error message string is printed.
-.Pp
-If
-.Fa errnum
-is not a recognized error number,
-the error message string will contain
-.Dq Li "Unknown error:\0
-followed by the error number in decimal.
-.Pp
-The message strings can be accessed directly using the external
-array
-.Va sys_errlist .
-The external value
-.Va sys_nerr
-contains a count of the messages in
-.Va 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 first appeared in
-.Bx 4.4 .
-.Sh BUGS
-For unknown error numbers, the
-.Fn strerror
-function will return its result in a static buffer which
-may be overwritten by subsequent calls.
-.Pp
-Programs that use the deprecated
-.Va sys_errlist
-variable often fail to compile because they declare it
-inconsistently.