sbin/swapon/swapon.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   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. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)swapon.c 8.1 (Berkeley) 6/5/93
  35  * $FreeBSD: src/sbin/swapon/swapon.c,v 1.8.2.2 2001/07/30 10:30:11 dd Exp $
  36  * $DragonFly: src/sbin/swapon/swapon.c,v 1.5 2005/11/06 12:50:21 swildner Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <fstab.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 static void usage(void);
  48 int     add(char *name, int ignoreebusy);
  49
  50 int
  51 main(int argc, char **argv)
  52 {
  53         struct fstab *fsp;
  54         int stat;
  55         int ch, doall;
  56
  57         doall = 0;
  58         while ((ch = getopt(argc, argv, "a")) != -1)
  59                 switch((char)ch) {
  60                 case 'a':
  61                         doall = 1;
  62                         break;
  63                 case '?':
  64                 default:
  65                         usage();
  66                 }
  67         argv += optind;
  68
  69         stat = 0;
  70         if (doall)
  71                 while ((fsp = getfsent()) != NULL) {
  72                         if (strcmp(fsp->fs_type, FSTAB_SW))
  73                                 continue;
  74                         if (strstr(fsp->fs_mntops, "noauto"))
  75                                 continue;
  76                         if (add(fsp->fs_spec, 1))
  77                                 stat = 1;
  78                         else
  79                                 printf("swapon: adding %s as swap device\n",
  80                                     fsp->fs_spec);
  81                 }
  82         else if (!*argv)
  83                 usage();
  84         for (; *argv; ++argv)
  85                 stat |= add(*argv, 0);
  86         exit(stat);
  87 }
  88
  89 int
  90 add(char *name, int ignoreebusy)
  91 {
  92         if (swapon(name) == -1) {
  93                 switch (errno) {
  94                 case EBUSY:
  95                         if (!ignoreebusy)
  96                                 warnx("%s: device already in use", name);
  97                         break;
  98                 default:
  99                         warn("%s", name);
 100                         break;
 101                 }
 102                 return(1);
 103         }
 104         return(0);
 105 }
 106
 107 static void
 108 usage(void)
 109 {
 110         fprintf(stderr, "usage: swapon [-a] [special_file ...]\n");
 111         exit(1);
 112 }