swaponoff.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini swapon/swapoff implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1999,2000 by Lineo, inc.
   7  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  */
  24
  25 #include "busybox.h"
  26 #include <stdio.h>
  27 #include <sys/mount.h>
  28 #include <mntent.h>
  29 #include <dirent.h>
  30 #include <errno.h>
  31
  32 _syscall2(int, swapon, const char *, path, int, flags);
  33 _syscall1(int, swapoff, const char *, path);
  34
  35
  36 static int whichApp;
  37
  38 static const int SWAPON_APP = 1;
  39 static const int SWAPOFF_APP = 2;
  40
  41
  42 static void swap_enable_disable(char *device)
  43 {
  44         int status;
  45
  46         if (whichApp == SWAPON_APP)
  47                 status = swapon(device, 0);
  48         else
  49                 status = swapoff(device);
  50
  51         if (status != 0)
  52                 perror_msg_and_die(applet_name);
  53 }
  54
  55 static void do_em_all()
  56 {
  57         struct mntent *m;
  58         FILE *f = setmntent("/etc/fstab", "r");
  59
  60         if (f == NULL)
  61                 perror_msg_and_die("/etc/fstab");
  62         while ((m = getmntent(f)) != NULL) {
  63                 if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
  64                         swap_enable_disable(m->mnt_fsname);
  65                 }
  66         }
  67         endmntent(f);
  68         exit(EXIT_SUCCESS);
  69 }
  70
  71
  72 extern int swap_on_off_main(int argc, char **argv)
  73 {
  74         if (strcmp(applet_name, "swapon") == 0) {
  75                 whichApp = SWAPON_APP;
  76         } else {
  77                 whichApp = SWAPOFF_APP;
  78         }
  79
  80         if (argc != 2) {
  81                 goto usage_and_exit;
  82         }
  83         argc--;
  84         argv++;
  85
  86         /* Parse any options */
  87         while (**argv == '-') {
  88                 while (*++(*argv))
  89                         switch (**argv) {
  90                         case 'a':
  91                                 {
  92                                         struct stat statBuf;
  93
  94                                         if (stat("/etc/fstab", &statBuf) < 0)
  95                                                 error_msg_and_die("/etc/fstab file missing\n");
  96                                 }
  97                                 do_em_all();
  98                                 break;
  99                         default:
 100                                 goto usage_and_exit;
 101                         }
 102         }
 103         swap_enable_disable(*argv);
 104         return EXIT_SUCCESS;
 105
 106   usage_and_exit:
 107         usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
 108 }