9a3009b800
and outputs the associated textual message in the same way that perror(3) would if called within a program.
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*-
|
|
* 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);
|
|
}
|