Contents of /trunk/mkinitrd-magellan/busybox/util-linux/swaponoff.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 2283 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini swapon/swapoff implementation for busybox |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under the GPL version 2, see the file LICENSE in this tarball. |
8 | */ |
9 | |
10 | #include "libbb.h" |
11 | #include <mntent.h> |
12 | #include <sys/swap.h> |
13 | |
14 | #if ENABLE_FEATURE_MOUNT_LABEL |
15 | # include "volume_id.h" |
16 | #else |
17 | # define resolve_mount_spec(fsname) ((void)0) |
18 | #endif |
19 | |
20 | #if ENABLE_FEATURE_SWAPON_PRI |
21 | struct globals { |
22 | int flags; |
23 | } FIX_ALIASING; |
24 | #define G (*(struct globals*)&bb_common_bufsiz1) |
25 | #define g_flags (G.flags) |
26 | #else |
27 | #define g_flags 0 |
28 | #endif |
29 | |
30 | static int swap_enable_disable(char *device) |
31 | { |
32 | int status; |
33 | struct stat st; |
34 | |
35 | resolve_mount_spec(&device); |
36 | xstat(device, &st); |
37 | |
38 | #if ENABLE_DESKTOP |
39 | /* test for holes */ |
40 | if (S_ISREG(st.st_mode)) |
41 | if (st.st_blocks * (off_t)512 < st.st_size) |
42 | bb_error_msg("warning: swap file has holes"); |
43 | #endif |
44 | |
45 | if (applet_name[5] == 'n') |
46 | status = swapon(device, g_flags); |
47 | else |
48 | status = swapoff(device); |
49 | |
50 | if (status != 0) { |
51 | bb_simple_perror_msg(device); |
52 | return 1; |
53 | } |
54 | |
55 | return 0; |
56 | } |
57 | |
58 | static int do_em_all(void) |
59 | { |
60 | struct mntent *m; |
61 | FILE *f; |
62 | int err; |
63 | |
64 | f = setmntent("/etc/fstab", "r"); |
65 | if (f == NULL) |
66 | bb_perror_msg_and_die("/etc/fstab"); |
67 | |
68 | err = 0; |
69 | while ((m = getmntent(f)) != NULL) { |
70 | if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) { |
71 | /* swapon -a should ignore entries with noauto, |
72 | * but swapoff -a should process them */ |
73 | if (applet_name[5] != 'n' |
74 | || hasmntopt(m, MNTOPT_NOAUTO) == NULL |
75 | ) { |
76 | err += swap_enable_disable(m->mnt_fsname); |
77 | } |
78 | } |
79 | } |
80 | |
81 | if (ENABLE_FEATURE_CLEAN_UP) |
82 | endmntent(f); |
83 | |
84 | return err; |
85 | } |
86 | |
87 | int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
88 | int swap_on_off_main(int argc UNUSED_PARAM, char **argv) |
89 | { |
90 | int ret; |
91 | |
92 | #if !ENABLE_FEATURE_SWAPON_PRI |
93 | ret = getopt32(argv, "a"); |
94 | #else |
95 | opt_complementary = "p+"; |
96 | ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags); |
97 | |
98 | if (ret & 2) { // -p |
99 | g_flags = SWAP_FLAG_PREFER | |
100 | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT); |
101 | ret &= 1; |
102 | } |
103 | #endif |
104 | |
105 | if (ret /* & 1: not needed */) // -a |
106 | return do_em_all(); |
107 | |
108 | argv += optind; |
109 | if (!*argv) |
110 | bb_show_usage(); |
111 | |
112 | /* ret = 0; redundant */ |
113 | do { |
114 | ret += swap_enable_disable(*argv); |
115 | } while (*++argv); |
116 | |
117 | return ret; |
118 | } |