source: branches/3.2/mindi-busybox/util-linux/swaponoff.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 2.9 KB
Line 
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 GPLv2, see file LICENSE in this source tree.
8 */
9
10//usage:#define swapon_trivial_usage
11//usage:       "[-a]" IF_FEATURE_SWAPON_PRI(" [-p PRI]") " [DEVICE]"
12//usage:#define swapon_full_usage "\n\n"
13//usage:       "Start swapping on DEVICE\n"
14//usage:     "\n    -a  Start swapping on all swap devices"
15//usage:    IF_FEATURE_SWAPON_PRI(
16//usage:     "\n    -p PRI  Set swap device priority"
17//usage:    )
18//usage:
19//usage:#define swapoff_trivial_usage
20//usage:       "[-a] [DEVICE]"
21//usage:#define swapoff_full_usage "\n\n"
22//usage:       "Stop swapping on DEVICE\n"
23//usage:     "\n    -a  Stop swapping on all swap devices"
24
25#include "libbb.h"
26#include <mntent.h>
27#ifndef __BIONIC__
28# include <sys/swap.h>
29#endif
30
31#if ENABLE_FEATURE_MOUNT_LABEL
32# include "volume_id.h"
33#else
34# define resolve_mount_spec(fsname) ((void)0)
35#endif
36
37#ifndef MNTTYPE_SWAP
38# define MNTTYPE_SWAP "swap"
39#endif
40
41#if ENABLE_FEATURE_SWAPON_PRI
42struct globals {
43    int flags;
44} FIX_ALIASING;
45#define G (*(struct globals*)&bb_common_bufsiz1)
46#define g_flags (G.flags)
47#else
48#define g_flags 0
49#endif
50#define INIT_G() do { } while (0)
51
52static int swap_enable_disable(char *device)
53{
54    int status;
55    struct stat st;
56
57    resolve_mount_spec(&device);
58    xstat(device, &st);
59
60#if ENABLE_DESKTOP
61    /* test for holes */
62    if (S_ISREG(st.st_mode))
63        if (st.st_blocks * (off_t)512 < st.st_size)
64            bb_error_msg("warning: swap file has holes");
65#endif
66
67    if (applet_name[5] == 'n')
68        status = swapon(device, g_flags);
69    else
70        status = swapoff(device);
71
72    if (status != 0) {
73        bb_simple_perror_msg(device);
74        return 1;
75    }
76
77    return 0;
78}
79
80static int do_em_all(void)
81{
82    struct mntent *m;
83    FILE *f;
84    int err;
85
86    f = setmntent("/etc/fstab", "r");
87    if (f == NULL)
88        bb_perror_msg_and_die("/etc/fstab");
89
90    err = 0;
91    while ((m = getmntent(f)) != NULL) {
92        if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0) {
93            /* swapon -a should ignore entries with noauto,
94             * but swapoff -a should process them */
95            if (applet_name[5] != 'n'
96             || hasmntopt(m, MNTOPT_NOAUTO) == NULL
97            ) {
98                err += swap_enable_disable(m->mnt_fsname);
99            }
100        }
101    }
102
103    if (ENABLE_FEATURE_CLEAN_UP)
104        endmntent(f);
105
106    return err;
107}
108
109int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
110int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
111{
112    int ret;
113
114    INIT_G();
115
116#if !ENABLE_FEATURE_SWAPON_PRI
117    ret = getopt32(argv, "a");
118#else
119    if (applet_name[5] == 'n')
120        opt_complementary = "p+";
121    ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
122
123    if (ret & 2) { // -p
124        g_flags = SWAP_FLAG_PREFER |
125            ((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
126        ret &= 1;
127    }
128#endif
129
130    if (ret /* & 1: not needed */) // -a
131        return do_em_all();
132
133    argv += optind;
134    if (!*argv)
135        bb_show_usage();
136
137    /* ret = 0; redundant */
138    do {
139        ret += swap_enable_disable(*argv);
140    } while (*++argv);
141
142    return ret;
143}
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