err, verr, errx, verrx, warn, vwarn, warnx, vwarnx — formatted error messages
#include <err.h>
void
err( |
int | eval, |
| const char * | fmt, | |
...); |
void
errx( |
int | eval, |
| const char * | fmt, | |
...); |
void
warn( |
const char * | fmt, |
...); |
void
warnx( |
const char * | fmt, |
...); |
#include <stdarg.h>
void
verr( |
int | eval, |
| const char * | fmt, | |
| va_list | args); |
void
verrx( |
int | eval, |
| const char * | fmt, | |
| va_list | args); |
void
vwarn( |
const char * | fmt, |
| va_list | args); |
void
vwarnx( |
const char * | fmt, |
| va_list | args); |
The err() and warn() family of functions display a
formatted error message on the standard error output. In all
cases, the last component of the program name, a colon
character, and a space are output. If the fmt argument is not NULL, the
printf(3)-like formatted
error message is output. The output is terminated by a
newline character.
The err(), verr(), warn(), and vwarn() functions append an error message
obtained from strerror(3) based on a code
or the global variable errno,
preceded by another colon and space unless the fmt argument is NULL.
The err(), verr(), warn(), and vwarn() functions use the global variable
errno to look up the error
message.
The errx() and warnx() functions do not append an error
message.
The err(), verr(), errx(), and verrx() functions do not return, but exit
with the value of the argument eval.
Display the current errno information string and exit:
if ((p = malloc(size)) == NULL) err(1, NULL); if ((fd = open(file_name, O_RDONLY, 0)) == −1) err(1, "%s", file_name);
Display an error message and exit:
if (tm.tm_hour < START_TIME) errx(1, "too early, wait until %s", start_time_string);
Warn of an error:
if ((fd = open(raw_device, O_RDONLY, 0)) == −1) warnx("%s: %s: trying the block device", raw_device, strerror(errno)); if ((fd = open(block_device, O_RDONLY, 0)) == −1) err(1, "%s", block_device);
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright (c) 1993 The Regents of the University of California. All rights reserved. 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. From: (#)err.3 8.1 (Berkeley) 6/9/93 $FreeBSD: src/lib/libc/gen/err.3,v 1.11.2.5 2001/08/17 15:42:32 ru Exp $ 2007-12-08, mtk, Converted from mdoc to man macros |