1 files changed, 102 insertions, 0 deletions
diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
new file mode 100644
index 0000000..863f773
--- /dev/null
+++ b/util-linux/swaponoff.c
@@ -0,0 +1,102 @@
+/* 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_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;
+
+	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;
+}