busybox/util-linux/swaponoff.c

/* vi: set sw=4 ts=4: */
/*
 * Mini swapon/swapoff implementation for busybox
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under the GPL version 2, see the file LICENSE in this tarball.
 */

#include "libbb.h"
#include <mntent.h>
#include <sys/swap.h>

#if ENABLE_FEATURE_MOUNT_LABEL
# include "volume_id.h"
#else
# define resolve_mount_spec(fsname) ((void)0)
#endif

#if ENABLE_FEATURE_SWAPON_PRI
struct globals {
	int flags;
};
#define G (*(struct globals*)&bb_common_bufsiz1)
#define g_flags (G.flags)
#else
#define g_flags 0
#endif

static int swap_enable_disable(char *device)
{
	int status;
	struct stat st;

	resolve_mount_spec(&device);
	xstat(device, &st);

#if ENABLE_DESKTOP
	/* test for holes */
	if (S_ISREG(st.st_mode))
		if (st.st_blocks * (off_t)512 < st.st_size)
			bb_error_msg("warning: swap file has holes");
#endif

	if (applet_name[5] == 'n')
		status = swapon(device, g_flags);
	else
		status = swapoff(device);

	if (status != 0) {
		bb_simple_perror_msg(device);
		return 1;
	}

	return 0;
}

static int do_em_all(void)
{
	struct mntent *m;
	FILE *f;
	int err;

	f = setmntent("/etc/fstab", "r");
	if (f == NULL)
		bb_perror_msg_and_die("/etc/fstab");

	err = 0;
	while ((m = getmntent(f)) != NULL)
		if (strcmp(m->mnt_type, MNTTYPE_SWAP) == 0)
			err += swap_enable_disable(m->mnt_fsname);

	endmntent(f);

	return err;
}

int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
{
	int ret;

#if !ENABLE_FEATURE_SWAPON_PRI
	ret = getopt32(argv, "a");
#else
	opt_complementary = "p+";
	ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);

	if (ret & 2) { // -p
		g_flags = SWAP_FLAG_PREFER |
			((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
		ret &= 1;
	}
#endif

	if (ret /* & 1: not needed */) // -a
		return do_em_all();

	argv += optind;
	if (!*argv)
		bb_show_usage();

	/* ret = 0; redundant */
	do {
		ret += swap_enable_disable(*argv);
	} while (*++argv);

	return ret;
}
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	};
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	err += swap_enable_disable(m->mnt_fsname);
72
73	endmntent(f);
74
75	return err;
76	}
77
78	int swap_on_off_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
79	int swap_on_off_main(int argc UNUSED_PARAM, char **argv)
80	{
81	int ret;
82
83	#if !ENABLE_FEATURE_SWAPON_PRI
84	ret = getopt32(argv, "a");
85	#else
86	opt_complementary = "p+";
87	ret = getopt32(argv, (applet_name[5] == 'n') ? "ap:" : "a", &g_flags);
88
89	if (ret & 2) { // -p
90	g_flags = SWAP_FLAG_PREFER \|
91	((g_flags & SWAP_FLAG_PRIO_MASK) << SWAP_FLAG_PRIO_SHIFT);
92	ret &= 1;
93	}
94	#endif
95
96	if (ret /* & 1: not needed */) // -a
97	return do_em_all();
98
99	argv += optind;
100	if (!*argv)
101	bb_show_usage();
102
103	/* ret = 0; redundant */
104	do {
105	ret += swap_enable_disable(*argv);
106	} while (*++argv);
107
108	return ret;
109	}