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Add a new program, perror, which takes an errno as a command line argument

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and outputs the associated textual message in the same way that
perror(3) would if called within a program.
This commit is contained in:
George V. Neville-Neil 2009-05-19 17:40:22 +00:00
parent 88608a2211
commit 9a3009b800
4 changed files with 133 additions and 0 deletions
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1
usr.bin/Makefile
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@ -149,6 +149,7 @@ SUBDIR= alias \
passwd \
paste \
pathchk \
perror \
pr \
printenv \
printf \

6
usr.bin/perror/Makefile Normal file
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@ -0,0 +1,6 @@
# $FreeBSD$
PROG= perror
SRCS= perror.c
.include <bsd.prog.mk>

50
usr.bin/perror/perror.1 Normal file
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@ -0,0 +1,50 @@
.\"
.\" Copyright (c) 2009 Advanced Computing Technologies LLC
.\" Written by: George V. Neville-Neil <gnn@FreeBSD.org>
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd May 12, 2009
.Dt PERROR 1
.Os
.Sh NAME
.Nm perror
.Nd "print an error number as a string"
.Sh SYNOPSIS
.Nm
.Op Ar number
.Sh DESCRIPTION
The
.Nm
program takes a raw errno value and prints it as a string.
.Sh SEE ALSO
.Xr perror 3
.Sh HISTORY
The
.Nm
program first appeared in
.Fx 8.0 .
.Sh AUTHORS
.An George V. Neville-Neil

76
usr.bin/perror/perror.c Normal file
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@ -0,0 +1,76 @@
/*-
* Copyright (c) 2009 Advanced Computing Technologies LLC
* Written by: George V. Neville-Neil <gnn@FreeBSD.org>
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/errno.h>
#define MAX_ERR 256
void usage()
{
printf("usage: perror number\n");
printf("number must be between 1 and %d\n", ELAST);
exit(1);
}
int main(int argc, char **argv)
{
char errstr[MAX_ERR];
char *cp;
int errnum;
if (argc != 2)
usage();
errnum = strtol(argv[1], &cp, 0);
if (((errnum == 0) && (errno == EINVAL)) || (*cp != '\0')) {
printf("Argument %s not a number.\n", argv[1]);
usage();
}
if ((errnum <=0) || (errnum > ELAST)) {
printf("Number %d out of range.\n", errnum);
usage();
}
if (strerror_r(errnum, errstr, sizeof(errstr)) < 0) {
printf("Could not find error number %d.\n", errnum);
usage();
}
printf("Error %d is \"%s\"\n", errnum, errstr);
exit(0);
}