Contents of /tags/mkinitrd-6_1_10/busybox/util-linux/swaponoff.c
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Wed Oct 28 09:51:31 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 1903 byte(s)
Wed Oct 28 09:51:31 2009 UTC (14 years, 11 months ago) by niro
File MIME type: text/plain
File size: 1903 byte(s)
tagged 'mkinitrd-6_1_10'
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_SWAPON_PRI |
15 | struct globals { |
16 | int flags; |
17 | }; |
18 | #define G (*(struct globals*)&bb_common_bufsiz1) |
19 | #define g_flags (G.flags) |
20 | #else |
21 | #define g_flags 0 |
22 | #endif |
23 | |
24 | static int swap_enable_disable(char *device) |
25 | { |
26 | int status; |
27 | struct stat st; |
28 | |
29 | xstat(device, &st); |
30 | |
31 | #if ENABLE_DESKTOP |
32 | /* test for holes */ |
33 | if (S_ISREG(st.st_mode)) |
34 | if (st.st_blocks * (off_t)512 < st.st_size) |
35 | bb_error_msg("warning: swap file has holes"); |
36 | #endif |
37 | |
38 | if (applet_name[5] == 'n') |
39 | status = swapon(device, g_flags); |
40 | else |
41 | status = swapoff(device); |
42 | |
43 | if (status != 0) { |
44 | bb_simple_perror_msg(device); |
45 | return 1; |
46 | } |
47 | |
48 | return 0; |
49 | } |
50 | |
51 | static int do_em_all(void) |
52 | { |
53 | struct mntent *m; |
54 | FILE *f; |
55 | int err; |
56 | |
57 | f = setmntent("/etc/fstab", "r"); |
58 | if (f == NULL) |
59 | bb_perror_msg_and_die("/etc/fstab"); |
60 | |
61 | err = 0; |
62 | while ((m = getmntent(f)) != NULL) |
63 | if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) |
64 | err += swap_enable_disable(m->mnt_fsname); |
65 | |
66 | endmntent(f); |
67 | |
68 | return err; |
69 | } |
70 | |
71 | int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
72 | int swap_on_off_main(int argc UNUSED_PARAM, char **argv) |
73 | { |
74 | int ret; |
75 | |
76 | #if !ENABLE_FEATURE_SWAPON_PRI |
77 | ret = getopt32(argv, "a"); |
78 | #else |
79 | opt_complementary = "p+"; |
80 | ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags); |
81 | |
82 | if (ret & 2) { // -p |
83 | g_flags = SWAP_FLAG_PREFER | |
84 | ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT); |
85 | ret &= 1; |
86 | } |
87 | #endif |
88 | |
89 | if (ret /* & 1: not needed */) // -a |
90 | return do_em_all(); |
91 | |
92 | argv += optind; |
93 | if (!*argv) |
94 | bb_show_usage(); |
95 | |
96 | /* ret = 0; redundant */ |
97 | do { |
98 | ret += swap_enable_disable(*argv); |
99 | } while (*++argv); |
100 | |
101 | return ret; |
102 | } |