mirror of
https://github.com/GnoConsortium/gno.git
synced 2024-08-20 11:29:01 +00:00
149 lines
4.3 KiB
Groff
149 lines
4.3 KiB
Groff
|
.\" 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
|
||
|
.\" $Id: err.3,v 1.1 1997/02/27 07:32:21 gdr Exp $
|
||
|
.\"
|
||
|
.TH ERR 3 "April 13, 1995" GNO "Library Routines"
|
||
|
.SH NAME
|
||
|
.BR err ,
|
||
|
.BR verr ,
|
||
|
.BR errx ,
|
||
|
.BR verrx ,
|
||
|
.BR warn ,
|
||
|
.BR vwarn ,
|
||
|
.BR warnx ,
|
||
|
.BR vwarnx ,
|
||
|
.BR err_set_file ,
|
||
|
.BR err_set_exit
|
||
|
\- formatted error messages
|
||
|
.SH SYNOPSIS
|
||
|
.nf
|
||
|
#include <err.h>
|
||
|
|
||
|
void err (int \fIeval\fR, const char *\fIfmt\fR, ...);
|
||
|
void verr (int \fIeval\fR, const char *\fIfmt\fR, va_list \fIargs\fR);
|
||
|
void errx (int \fIeval\fR, const char *\fIfmt\fR, ...);
|
||
|
void verrx (int \fIeval\fR, const char *\fIfmt\fR, va_list \fIargs\fR);
|
||
|
void warn (const char *\fIfmt\fR, ...);
|
||
|
void vwarn (const char *\fIfmt\fR, va_list \fIargs\fR);
|
||
|
void warnx (const char *\fIfmt\fR, ...);
|
||
|
void vwarnx (const char *\fIfmt\fR, va_list \fIargs\fR);
|
||
|
void err_set_file (void *\fIfp\fR);
|
||
|
void err_set_exit (void (*\fIexitf\fR)(int));
|
||
|
.fi
|
||
|
.SH DESCRIPTION
|
||
|
The
|
||
|
.BR err
|
||
|
and
|
||
|
.BR warn
|
||
|
family of functions display a formatted error message on the standard
|
||
|
error output, or on another file specified using the
|
||
|
.BR err_set_file
|
||
|
function.
|
||
|
In all cases, the last component of the program name, a colon character,
|
||
|
and a space are output.
|
||
|
If the
|
||
|
.IR fmt
|
||
|
argument is not NULL, the formatted error message, a colon character,
|
||
|
and a space are output.
|
||
|
In the case of the
|
||
|
.BR err ,
|
||
|
.BR verr ,
|
||
|
.BR warn ,
|
||
|
and
|
||
|
.BR vwarn
|
||
|
functions, the error message string affiliated with the current value of
|
||
|
the global variable
|
||
|
.IR errno
|
||
|
is output.
|
||
|
In all cases, the output is followed by a newline character.
|
||
|
.LP
|
||
|
The
|
||
|
.BR err ,
|
||
|
.BR verr ,
|
||
|
.BR errx ,
|
||
|
and
|
||
|
.BR verrx
|
||
|
functions do not return, but exit with the value of the argument
|
||
|
.RI ( eval )
|
||
|
The
|
||
|
.BR err_set_exit
|
||
|
function can be used to specify a function which is called before
|
||
|
.BR exit (3)
|
||
|
to perform any necessary cleanup; passing a null function pointer for
|
||
|
.IR exitf
|
||
|
resets the hook to do nothing.
|
||
|
.SH EXAMPLES
|
||
|
Display the current errno information string and exit:
|
||
|
.RS
|
||
|
.nf
|
||
|
|
||
|
if ((p = malloc(size)) == NULL)
|
||
|
err(1, NULL);
|
||
|
if ((fd = open(file_name, O_RDONLY, 0)) == -1)
|
||
|
err(1, "%s", file_name);
|
||
|
|
||
|
.fi
|
||
|
.RE
|
||
|
.LP
|
||
|
Display an error message and exit:
|
||
|
.RS
|
||
|
.nf
|
||
|
|
||
|
if (tm.tm_hour < START_TIME)
|
||
|
errx(1, "too early, wait until %s", start_time_string);
|
||
|
|
||
|
.fi
|
||
|
.RE
|
||
|
.LP
|
||
|
Warn of an error:
|
||
|
.RS
|
||
|
.nf
|
||
|
|
||
|
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);
|
||
|
|
||
|
.fi
|
||
|
.RE
|
||
|
.SH "SEE ALSO"
|
||
|
.BR exit (3),
|
||
|
.BR strerror (3)
|
||
|
.SH HISTORY
|
||
|
The
|
||
|
.BR err
|
||
|
and
|
||
|
.BR warn
|
||
|
functions first appeared in 4.4BSD.
|