diff options
Diffstat (limited to 'util-linux/swaponoff.c')
-rw-r--r-- | util-linux/swaponoff.c | 102 |
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; +} |