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
48 void
panic(const char * a)49 panic(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
62 void
perr(const char * a)63 perr(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
79 void
usage(void)80 usage(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