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 | //usage:#define swapon_trivial_usage
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11 | //usage: "[-a]" IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
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12 | //usage:#define swapon_full_usage "\n\n"
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13 | //usage: "Start swapping on DEVICE\n"
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14 | //usage: "\n -a Start swapping on all swap devices"
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15 | //usage: IF_FEATURE_SWAPON_PRI(
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16 | //usage: "\n -p PRI Set swap device priority"
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17 | //usage: )
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18 | //usage:
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19 | //usage:#define swapoff_trivial_usage
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20 | //usage: "[-a] [DEVICE]"
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21 | //usage:#define swapoff_full_usage "\n\n"
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22 | //usage: "Stop swapping on DEVICE\n"
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23 | //usage: "\n -a Stop swapping on all swap devices"
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24 |
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25 | #include "libbb.h"
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26 | #include <mntent.h>
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27 | #ifndef __BIONIC__
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28 | # include <sys/swap.h>
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29 | #endif
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30 |
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31 | #if ENABLE_FEATURE_MOUNT_LABEL
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32 | # include "volume_id.h"
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33 | #else
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34 | # define resolve_mount_spec(fsname) ((void)0)
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35 | #endif
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36 |
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37 | #ifndef MNTTYPE_SWAP
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38 | # define MNTTYPE_SWAP "swap"
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39 | #endif
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40 |
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41 | #if ENABLE_FEATURE_SWAPON_PRI
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42 | struct globals {
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43 | int flags;
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44 | } FIX_ALIASING;
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45 | #define G (*(struct globals*)&bb_common_bufsiz1)
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46 | #define g_flags (G.flags)
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47 | #else
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48 | #define g_flags 0
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49 | #endif
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50 | #define INIT_G() do { } while (0)
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51 |
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52 | static int swap_enable_disable(char *device)
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53 | {
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54 | int status;
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55 | struct stat st;
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56 |
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57 | resolve_mount_spec(&device);
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58 | xstat(device, &st);
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59 |
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60 | #if ENABLE_DESKTOP
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61 | /* test for holes */
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62 | if (S_ISREG(st.st_mode))
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63 | if (st.st_blocks * (off_t)512 < st.st_size)
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64 | bb_error_msg("warning: swap file has holes");
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65 | #endif
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66 |
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67 | if (applet_name[5] == 'n')
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68 | status = swapon(device, g_flags);
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69 | else
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70 | status = swapoff(device);
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71 |
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72 | if (status != 0) {
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73 | bb_simple_perror_msg(device);
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74 | return 1;
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75 | }
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76 |
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77 | return 0;
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78 | }
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79 |
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80 | static int do_em_all(void)
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81 | {
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82 | struct mntent *m;
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83 | FILE *f;
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84 | int err;
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85 |
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86 | f = setmntent("/etc/fstab", "r");
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87 | if (f == NULL)
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88 | bb_perror_msg_and_die("/etc/fstab");
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89 |
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90 | err = 0;
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91 | while ((m = getmntent(f)) != NULL) {
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92 | if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
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93 | /* swapon -a should ignore entries with noauto,
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94 | * but swapoff -a should process them */
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95 | if (applet_name[5] != 'n'
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96 | || hasmntopt(m, MNTOPT_NOAUTO) == NULL
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97 | ) {
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98 | err += swap_enable_disable(m->mnt_fsname);
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99 | }
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100 | }
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101 | }
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102 |
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103 | if (ENABLE_FEATURE_CLEAN_UP)
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104 | endmntent(f);
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105 |
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106 | return err;
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107 | }
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108 |
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109 | int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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110 | int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
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111 | {
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112 | int ret;
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113 |
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114 | INIT_G();
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115 |
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116 | #if !ENABLE_FEATURE_SWAPON_PRI
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117 | ret = getopt32(argv, "a");
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118 | #else
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119 | if (applet_name[5] == 'n')
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120 | opt_complementary = "p+";
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121 | ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
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122 |
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123 | if (ret & 2) { // -p
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124 | g_flags = SWAP_FLAG_PREFER |
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125 | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
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126 | ret &= 1;
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127 | }
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128 | #endif
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129 |
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130 | if (ret /* & 1: not needed */) // -a
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131 | return do_em_all();
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132 |
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133 | argv += optind;
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134 | if (!*argv)
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135 | bb_show_usage();
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136 |
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137 | /* ret = 0; redundant */
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138 | do {
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139 | ret += swap_enable_disable(*argv);
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140 | } while (*++argv);
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141 |
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142 | return ret;
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143 | }
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