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-.\"     $OpenBSD: strerror.3,v 1.16 2019/05/16 13:35:16 schwarze Exp $
-.\"
-.\" Copyright (c) 1980, 1991 Regents of the University of California.
-.\" Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
-.\" 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. 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.
-.\"
-.Dd $Mdocdate: May 16 2019 $
-.Dt STRERROR 3
-.Os
-.Sh NAME
-.Nm strerror ,
-.Nm strerror_l ,
-.Nm strerror_r
-.Nd get error message string
-.Sh SYNOPSIS
-.In string.h
-.Ft char *
-.Fn strerror "int errnum"
-.Ft char *
-.Fn strerror_l "int errnum" "locale_t locale"
-.Ft int
-.Fn strerror_r "int errnum" "char *strerrbuf" "size_t buflen"
-.Sh DESCRIPTION
-These functions map the error number
-.Fa errnum
-to an error message string.
-.Pp
-.Fn strerror
-and
-.Fn strerror_l
-return a string containing a maximum of
-.Dv NL_TEXTMAX
-characters, including the trailing NUL.
-This string is not to be modified by the calling program.
-The string returned by
-.Fn strerror
-may be overwritten by subsequent calls to
-.Fn strerror
-in any thread.
-The string returned by
-.Fn strerror_l
-may be overwritten by subsequent calls to
-.Fn strerror_l
-in the same thread.
-.Pp
-.Fn strerror_r
-is a thread safe version of
-.Fn strerror
-that places the error message in the specified buffer
-.Fa strerrbuf .
-.Pp
-On
-.Ox ,
-the global locale, the thread-specific locale, and the
-.Fa locale
-argument are ignored.
-.Sh RETURN VALUES
-.Fn strerror
-and
-.Fn strerror_l
-return a pointer to the error message string.
-If an error occurs, the error code is stored in
-.Va errno .
-.Pp
-.Fn strerror_r
-returns zero upon successful completion.
-If an error occurs, the error code is stored in
-.Va errno
-and the error code is returned.
-.Sh ERRORS
-All these functions may fail if:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-.Fa errnum
-is not a valid error number.
-The returned error string will consist of an error message that includes
-.Fa errnum .
-.El
-.Pp
-.Fn strerror_r
-may also fail if:
-.Bl -tag -width Er
-.It Bq Er ERANGE
-The error message is larger than
-.Fa buflen
-characters.
-The message will be truncated to fit.
-.El
-.Sh SEE ALSO
-.Xr intro 2 ,
-.Xr newlocale 3 ,
-.Xr perror 3 ,
-.Xr setlocale 3
-.Sh STANDARDS
-The
-.Fn strerror
-function conforms to
-.St -isoC-99 .
-The
-.Fn strerror_l
-and
-.Fn strerror_r
-functions conform to
-.St -p1003.1-2008 .
-.Sh HISTORY
-The
-.Fn strerror
-function has been available since
-.Bx 4.3 Reno ,
-.Fn strerror_r
-since
-.Ox 3.3 ,
-and
-.Fn strerror_l
-since
-.Ox 6.2 .
-.Sh CAVEATS
-On systems other than
-.Ox ,
-the
-.Dv LC_MESSAGES
-.Xr locale 1
-category can cause different strings to be returned instead of the
-normal error messages; see CAVEATS in
-.Xr setlocale 3
-for details.