1/*-
2 *  panic.c - terminate fast in case of error
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 *
6 *  Copyright (C) 1993  Thomas Koenig
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author(s) may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30/* System Headers */
31
32#include <err.h>
33#include <errno.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <unistd.h>
37
38/* Local headers */
39
40#include "panic.h"
41#include "privs.h"
42#include "at.h"
43
44/* External variables */
45
46/* Global functions */
47
48void
49panic(const char *a)
50{
51/* Something fatal has happened, print error message and exit.
52 */
53	if (fcreated) {
54		PRIV_START
55		unlink(atfile);
56		PRIV_END
57	}
58
59	errx(EXIT_FAILURE, "%s", a);
60}
61
62void
63perr(const char *a)
64{
65/* Some operating system error; print error message and exit.
66 */
67	int serrno = errno;
68
69	if (fcreated) {
70		PRIV_START
71		unlink(atfile);
72		PRIV_END
73	}
74
75	errno = serrno;
76	err(EXIT_FAILURE, "%s", a);
77}
78
79void
80usage(void)
81{
82	/* Print usage and exit. */
83    fprintf(stderr, "usage: at [-q x] [-f file] [-m] time\n"
84		    "       at -c job [job ...]\n"
85		    "       at [-f file] -t [[CC]YY]MMDDhhmm[.SS]\n"
86		    "       at -r job [job ...]\n"
87		    "       at -l -q queuename\n"
88		    "       at -l [job ...]\n"
89		    "       atq [-q x] [-v]\n"
90		    "       atrm job [job ...]\n"
91		    "       batch [-f file] [-m]\n");
92    exit(EXIT_FAILURE);
93}
94