| /* vi: set sw=4 ts=4: */ |
| /* |
| * Mini swapon/swapoff implementation for busybox |
| * |
| * |
| * Copyright (C) 1999,2000 by Lineo, inc. |
| * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include "internal.h" |
| #include <stdio.h> |
| #include <sys/mount.h> |
| #include <mntent.h> |
| #include <dirent.h> |
| #include <errno.h> |
| #include <linux/unistd.h> |
| |
| _syscall2(int, swapon, const char *, path, int, flags); |
| _syscall1(int, swapoff, const char *, path); |
| |
| |
| static int whichApp; |
| static const char *appName; |
| |
| static const char swapoff_usage[] = |
| "swapoff [OPTION] [device]\n" |
| #ifndef BB_FEATURE_TRIVIAL_HELP |
| "\nStop swapping virtual memory pages on the given device.\n\n" |
| "Options:\n" |
| "\t-a\tStop swapping on all swap devices\n" |
| #endif |
| ; |
| |
| static const char swapon_usage[] = |
| "swapon [OPTION] [device]\n" |
| #ifndef BB_FEATURE_TRIVIAL_HELP |
| "\nStart swapping virtual memory pages on the given device.\n\n" |
| "Options:\n" |
| "\t-a\tStart swapping on all swap devices\n" |
| #endif |
| ; |
| |
| |
| #define SWAPON_APP 1 |
| #define SWAPOFF_APP 2 |
| |
| |
| static void swap_enable_disable(char *device) |
| { |
| int status; |
| |
| if (whichApp == SWAPON_APP) |
| status = swapon(device, 0); |
| else |
| status = swapoff(device); |
| |
| if (status != 0) { |
| perror(appName); |
| exit(FALSE); |
| } |
| } |
| |
| static void do_em_all() |
| { |
| struct mntent *m; |
| FILE *f = setmntent("/etc/fstab", "r"); |
| |
| if (f == NULL) { |
| perror("/etc/fstab"); |
| exit(FALSE); |
| } |
| while ((m = getmntent(f)) != NULL) { |
| if (strcmp(m->mnt_type, MNTTYPE_SWAP)==0) { |
| swap_enable_disable(m->mnt_fsname); |
| } |
| } |
| endmntent(f); |
| exit(TRUE); |
| } |
| |
| |
| extern int swap_on_off_main(int argc, char **argv) |
| { |
| if (strcmp(*argv, "swapon") == 0) { |
| appName = *argv; |
| whichApp = SWAPON_APP; |
| |
| } else { |
| appName = *argv; |
| whichApp = SWAPOFF_APP; |
| } |
| |
| if (argc != 2) { |
| goto usage_and_exit; |
| } |
| argc--; |
| argv++; |
| |
| /* Parse any options */ |
| while (**argv == '-') { |
| while (*++(*argv)) |
| switch (**argv) { |
| case 'a': |
| { |
| struct stat statBuf; |
| |
| if (stat("/etc/fstab", &statBuf) < 0) |
| fatalError("/etc/fstab file missing\n"); |
| } |
| do_em_all(); |
| break; |
| default: |
| goto usage_and_exit; |
| } |
| } |
| swap_enable_disable(*argv); |
| exit(TRUE); |
| |
| usage_and_exit: |
| usage((whichApp == SWAPON_APP) ? swapon_usage : swapoff_usage); |
| exit(FALSE); |
| } |