util-linux/swaponoff.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini swapon/swapoff implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1999,2000,2001 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 <mntent.h>
  28 #include <dirent.h>
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <sys/mount.h>
  32 #include <sys/syscall.h>
  33 #include <linux/unistd.h>
  34
  35 _syscall2(int, swapon, const char *, path, int, flags);
  36 _syscall1(int, swapoff, const char *, path);
  37
  38
  39 static int whichApp;
  40
  41 static const int SWAPON_APP = 1;
  42 static const int SWAPOFF_APP = 2;
  43
  44
  45 static void swap_enable_disable(char *device)
  46 {
  47         int status;
  48
  49         if (whichApp == SWAPON_APP)
  50                 status = swapon(device, 0);
  51         else
  52                 status = swapoff(device);
  53
  54         if (status != 0)
  55                 perror_msg_and_die(applet_name);
  56 }
  57
  58 static void do_em_all()
  59 {
  60         struct mntent *m;
  61         FILE *f = setmntent("/etc/fstab", "r");
  62
  63         if (f == NULL)
  64                 perror_msg_and_die("/etc/fstab");
  65         while ((m = getmntent(f)) != NULL) {
  66                 if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) {
  67                         swap_enable_disable(m->mnt_fsname);
  68                 }
  69         }
  70         endmntent(f);
  71         exit(EXIT_SUCCESS);
  72 }
  73
  74
  75 extern int swap_on_off_main(int argc, char **argv)
  76 {
  77         if (strcmp(applet_name, "swapon") == 0) {
  78                 whichApp = SWAPON_APP;
  79         } else {
  80                 whichApp = SWAPOFF_APP;
  81         }
  82
  83         if (argc != 2) {
  84                 goto usage_and_exit;
  85         }
  86         argc--;
  87         argv++;
  88
  89         /* Parse any options */
  90         while (**argv == '-') {
  91                 while (*++(*argv))
  92                         switch (**argv) {
  93                         case 'a':
  94                                 {
  95                                         struct stat statBuf;
  96
  97                                         if (stat("/etc/fstab", &statBuf) < 0)
  98                                                 error_msg_and_die("/etc/fstab file missing");
  99                                 }
 100                                 do_em_all();
 101                                 break;
 102                         default:
 103                                 goto usage_and_exit;
 104                         }
 105         }
 106         swap_enable_disable(*argv);
 107         return EXIT_SUCCESS;
 108
 109   usage_and_exit:
 110         usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage);
 111 }