[3320] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini swapon/swapoff implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 | #include <mntent.h>
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| 12 | #include <sys/swap.h>
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| 13 |
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| 14 | #if ENABLE_FEATURE_MOUNT_LABEL
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| 15 | # include "volume_id.h"
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| 16 | #else
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| 17 | # define resolve_mount_spec(fsname) ((void)0)
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| 18 | #endif
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| 19 |
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| 20 | #if ENABLE_FEATURE_SWAPON_PRI
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| 21 | struct globals {
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| 22 | int flags;
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| 23 | } FIX_ALIASING;
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| 24 | #define G (*(struct globals*)&bb_common_bufsiz1)
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| 25 | #define g_flags (G.flags)
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| 26 | #else
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| 27 | #define g_flags 0
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| 28 | #endif
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| 29 |
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| 30 | static int swap_enable_disable(char *device)
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| 31 | {
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| 32 | int status;
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| 33 | struct stat st;
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| 34 |
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| 35 | resolve_mount_spec(&device);
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| 36 | xstat(device, &st);
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| 37 |
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| 38 | #if ENABLE_DESKTOP
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| 39 | /* test for holes */
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| 40 | if (S_ISREG(st.st_mode))
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| 41 | if (st.st_blocks * (off_t)512 < st.st_size)
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| 42 | bb_error_msg("warning: swap file has holes");
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| 43 | #endif
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| 44 |
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| 45 | if (applet_name[5] == 'n')
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| 46 | status = swapon(device, g_flags);
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| 47 | else
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| 48 | status = swapoff(device);
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| 49 |
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| 50 | if (status != 0) {
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| 51 | bb_simple_perror_msg(device);
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| 52 | return 1;
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| 53 | }
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| 54 |
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| 55 | return 0;
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| 56 | }
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| 57 |
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| 58 | static int do_em_all(void)
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| 59 | {
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| 60 | struct mntent *m;
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| 61 | FILE *f;
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| 62 | int err;
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| 63 |
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| 64 | f = setmntent("/etc/fstab", "r");
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| 65 | if (f == NULL)
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| 66 | bb_perror_msg_and_die("/etc/fstab");
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| 67 |
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| 68 | err = 0;
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| 69 | while ((m = getmntent(f)) != NULL) {
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| 70 | if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
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| 71 | /* swapon -a should ignore entries with noauto,
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| 72 | * but swapoff -a should process them */
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| 73 | if (applet_name[5] != 'n'
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| 74 | || hasmntopt(m, MNTOPT_NOAUTO) == NULL
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| 75 | ) {
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| 76 | err += swap_enable_disable(m->mnt_fsname);
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| 77 | }
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | if (ENABLE_FEATURE_CLEAN_UP)
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| 82 | endmntent(f);
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| 83 |
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| 84 | return err;
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| 85 | }
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| 86 |
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| 87 | int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 88 | int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
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| 89 | {
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| 90 | int ret;
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| 91 |
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| 92 | #if !ENABLE_FEATURE_SWAPON_PRI
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| 93 | ret = getopt32(argv, "a");
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| 94 | #else
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| 95 | opt_complementary = "p+";
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| 96 | ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
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| 97 |
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| 98 | if (ret & 2) { // -p
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| 99 | g_flags = SWAP_FLAG_PREFER |
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| 100 | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
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| 101 | ret &= 1;
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| 102 | }
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| 103 | #endif
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| 104 |
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| 105 | if (ret /* & 1: not needed */) // -a
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| 106 | return do_em_all();
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| 107 |
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| 108 | argv += optind;
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| 109 | if (!*argv)
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| 110 | bb_show_usage();
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| 111 |
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| 112 | /* ret = 0; redundant */
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| 113 | do {
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| 114 | ret += swap_enable_disable(*argv);
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| 115 | } while (*++argv);
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| 116 |
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| 117 | return ret;
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| 118 | }
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