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path: root/release/src/router/busybox/miscutils/mountpoint.c
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Diffstat (limited to 'release/src/router/busybox/miscutils/mountpoint.c')
-rw-r--r--release/src/router/busybox/miscutils/mountpoint.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/release/src/router/busybox/miscutils/mountpoint.c b/release/src/router/busybox/miscutils/mountpoint.c
new file mode 100644
index 00000000..b541ce28
--- /dev/null
+++ b/release/src/router/busybox/miscutils/mountpoint.c
@@ -0,0 +1,72 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * mountpoint implementation for busybox
+ *
+ * Copyright (C) 2005 Bernhard Reutner-Fischer
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ *
+ * Based on sysvinit's mountpoint
+ */
+
+#include "libbb.h"
+
+int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int mountpoint_main(int argc UNUSED_PARAM, char **argv)
+{
+ struct stat st;
+ const char *msg;
+ char *arg;
+ int rc, opt;
+
+ opt_complementary = "=1"; /* must have one argument */
+ opt = getopt32(argv, "qdxn");
+#define OPT_q (1)
+#define OPT_d (2)
+#define OPT_x (4)
+#define OPT_n (8)
+ arg = argv[optind];
+ msg = "%s";
+
+ rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
+ if (rc != 0)
+ goto err;
+
+ if (opt & OPT_x) {
+ if (S_ISBLK(st.st_mode)) {
+ printf("%u:%u\n", major(st.st_rdev),
+ minor(st.st_rdev));
+ return EXIT_SUCCESS;
+ }
+ errno = 0; /* make perror_msg work as error_msg */
+ msg = "%s: not a block device";
+ goto err;
+ }
+
+ errno = ENOTDIR;
+ if (S_ISDIR(st.st_mode)) {
+ dev_t st_dev = st.st_dev;
+ ino_t st_ino = st.st_ino;
+ char *p = xasprintf("%s/..", arg);
+
+ if (stat(p, &st) == 0) {
+ //int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino);
+ int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino);
+
+ if (opt & OPT_d)
+ printf("%u:%u\n", major(st_dev), minor(st_dev));
+ if (opt & OPT_n)
+ printf("%s %s\n", find_block_device(arg), arg);
+ if (!(opt & (OPT_q | OPT_d | OPT_n)))
+ printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : "");
+ return is_not_mnt;
+ }
+ arg = p;
+ /* else: stat had set errno, just fall through */
+ }
+
+ err:
+ if (!(opt & OPT_q))
+ bb_perror_msg(msg, arg);
+ return EXIT_FAILURE;
+}