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 1.10 1999/12/05 19:57:14 charnier Exp $
  26  * $DragonFly: src/usr.bin/at/panic.c,v 1.3 2004/09/20 13:11:54 joerg 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 "panic.h"
  40 #include "at.h"
  41
  42 /* External variables */
  43
  44 /* Global functions */
  45
  46 void
  47 panic(const char *a)
  48 {
  49 /* Something fatal has happened, print error message and exit.
  50  */
  51         if (fcreated)
  52                 unlink(atfile);
  53
  54         errx(EXIT_FAILURE, "%s", a);
  55 }
  56
  57 void
  58 perr(const char *a)
  59 {
  60 /* Some operating system error; print error message and exit.
  61  */
  62         int serrno = errno;
  63
  64         if (fcreated)
  65                 unlink(atfile);
  66
  67         errno = serrno;
  68         err(EXIT_FAILURE, "%s", a);
  69 }
  70
  71 void
  72 usage(void)
  73 {
  74         /* Print usage and exit. */
  75     fprintf(stderr, "usage: at [-V] [-q x] [-f file] [-m] time\n"
  76                     "       at [-V] -c job [job ...]\n"
  77                     "       atq [-V] [-q x] [-v]\n"
  78                     "       atrm [-V] job [job ...]\n"
  79                     "       batch [-V] [-f file] [-m]\n");
  80     exit(EXIT_FAILURE);
  81 }