usr.bin/at/panic.c

   1 /*
   2  *  panic.c - terminate fast in case of error
   3  *  Copyright (C) 1993  Thomas Koenig
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. The name of the author(s) may not be used to endorse or promote
  11  *    products derived from this software without specific prior written
  12  *    permission.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  * $FreeBSD: src/usr.bin/at/panic.c,v 1.17 2002/05/16 00:47:14 tjr Exp $
  26  * $DragonFly: src/usr.bin/at/panic.c,v 1.4 2007/08/26 16:12:27 pavalos Exp $
  27  */
  28
  29 /* System Headers */
  30
  31 #include <err.h>
  32 #include <errno.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <unistd.h>
  36
  37 /* Local headers */
  38
  39 #include "at.h"
  40 #include "panic.h"
  41 #include "privs.h"
  42
  43 /* External variables */
  44
  45 /* Global functions */
  46
  47 void
  48 panic(const char *a)
  49 {
  50 /* Something fatal has happened, print error message and exit.
  51  */
  52         if (fcreated) {
  53                 PRIV_START
  54                 unlink(atfile);
  55                 PRIV_END
  56         }
  57
  58         errx(EXIT_FAILURE, "%s", a);
  59 }
  60
  61 void
  62 perr(const char *a)
  63 {
  64 /* Some operating system error; print error message and exit.
  65  */
  66         int serrno = errno;
  67
  68         if (fcreated) {
  69                 PRIV_START
  70                 unlink(atfile);
  71                 PRIV_END
  72         }
  73
  74         errno = serrno;
  75         err(EXIT_FAILURE, "%s", a);
  76 }
  77
  78 void
  79 usage(void)
  80 {
  81         /* Print usage and exit. */
  82     fprintf(stderr, "usage: at [-q x] [-f file] [-m] time\n"
  83                     "       at -c job [job ...]\n"
  84                     "       at [-f file] -t [[CC]YY]MMDDhhmm[.SS]\n"
  85                     "       at -r job [job ...]\n"
  86                     "       at -l -q queuename\n"
  87                     "       at -l [job ...]\n"
  88                     "       atq [-q x] [-v]\n"
  89                     "       atrm job [job ...]\n"
  90                     "       batch [-f file] [-m]\n");
  91     exit(EXIT_FAILURE);
  92 }