/* vi: set sw=4 ts=4: */ /* * Mini swapon/swapoff implementation for busybox * * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> * * Licensed under GPLv2, see file LICENSE in this source tree. */ //usage:#define swapon_trivial_usage //usage: "[-a]" IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]" //usage:#define swapon_full_usage "\n\n" //usage: "Start swapping on DEVICE\n" //usage: "\nOptions:" //usage: "\n -a Start swapping on all swap devices" //usage: IF_FEATURE_SWAPON_PRI( //usage: "\n -p PRI Set swap device priority" //usage: ) //usage: //usage:#define swapoff_trivial_usage //usage: "[-a] [DEVICE]" //usage:#define swapoff_full_usage "\n\n" //usage: "Stop swapping on DEVICE\n" //usage: "\nOptions:" //usage: "\n -a Stop swapping on all swap devices" #include "libbb.h" #include <mntent.h> #include <sys/swap.h> #if ENABLE_FEATURE_MOUNT_LABEL # include "volume_id.h" #else # define resolve_mount_spec(fsname) ((void)0) #endif #if ENABLE_FEATURE_SWAPON_PRI struct globals { int flags; } FIX_ALIASING; #define G (*(struct globals*)&bb_common_bufsiz1) #define g_flags (G.flags) #else #define g_flags 0 #endif static int swap_enable_disable(char *device) { int status; struct stat st; resolve_mount_spec(&device); xstat(device, &st); #if ENABLE_DESKTOP /* test for holes */ if (S_ISREG(st.st_mode)) if (st.st_blocks * (off_t)512 < st.st_size) bb_error_msg("warning: swap file has holes"); #endif if (applet_name[5] == 'n') status = swapon(device, g_flags); else status = swapoff(device); if (status != 0) { bb_simple_perror_msg(device); return 1; } return 0; } static int do_em_all(void) { struct mntent *m; FILE *f; int err; f = setmntent("/etc/fstab", "r"); if (f == NULL) bb_perror_msg_and_die("/etc/fstab"); err = 0; while ((m = getmntent(f)) != NULL) { if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) { /* swapon -a should ignore entries with noauto, * but swapoff -a should process them */ if (applet_name[5] != 'n' || hasmntopt(m, MNTOPT_NOAUTO) == NULL ) { err += swap_enable_disable(m->mnt_fsname); } } } if (ENABLE_FEATURE_CLEAN_UP) endmntent(f); return err; } int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int swap_on_off_main(int argc UNUSED_PARAM, char **argv) { int ret; #if !ENABLE_FEATURE_SWAPON_PRI ret = getopt32(argv, "a"); #else opt_complementary = "p+"; ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags); if (ret & 2) { // -p g_flags = SWAP_FLAG_PREFER | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT); ret &= 1; } #endif if (ret /* & 1: not needed */) // -a return do_em_all(); argv += optind; if (!*argv) bb_show_usage(); /* ret = 0; redundant */ do { ret += swap_enable_disable(*argv); } while (*++argv); return ret; }