Adding mountpoint

1 files changed, 56 insertions, 0 deletions

diff --git a/toys/mountpoint.c b/toys/mountpoint.c
new file mode 100644
index 00000000..405bb3a5
--- /dev/null
+++ b/toys/mountpoint.c
@@ -0,0 +1,56 @@
+/* vi: set sw=4 ts=4:
+ *
+ * mountpoint.c - Check if a directory is a mountpoint.
+ *
+ * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
+ *
+ * Not in SUSv4.
+
+USE_MOUNTPOINT(NEWTOY(mountpoint, "<1qdx", TOYFLAG_BIN))
+
+config MOUNTPOINT
+	bool "mountpoint"
+	default y
+	help
+	  usage: mountpoint [-q] [-d] directory
+			 mountpoint [-q] [-x] device 
+	  -q Be quiet, return zero if directory is a mountpoint
+	  -d Print major/minor device number of the directory
+	  -x Print major/minor device number of the block device
+*/
+
+#include "toys.h"
+
+void mountpoint_main(void)
+{
+	struct stat st1, st2;
+	int res = 0;
+	int quiet = toys.optflags & 0x4;
+	toys.exitval = 1; // be pessimistic
+	strncpy(toybuf, toys.optargs[0], sizeof(toybuf));
+	if (((toys.optflags & 0x1) && lstat(toybuf, &st1)) || stat(toybuf, &st1))
+		perror_exit("%s", toybuf);
+
+	if (toys.optflags & 0x1){
+		if (S_ISBLK(st1.st_mode)) {
+			if (!quiet) printf("%u:%u\n", major(st1.st_rdev), minor(st1.st_rdev));
+			toys.exitval = 0;
+			return;
+		}
+		if (!quiet) printf("%s: not a block device\n", toybuf);
+		return;
+	}
+
+	if(!S_ISDIR(st1.st_mode)){
+		if (!quiet) printf("%s: not a directory\n", toybuf);
+		return;
+	}
+	strncat(toybuf, "/..", sizeof(toybuf));
+	stat(toybuf, &st2);
+	res = (st1.st_dev != st2.st_dev) ||
+		(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
+	if (!quiet) printf("%s is %sa mountpoint\n", toys.optargs[0], res ? "" : "not ");
+	if (toys.optflags & 0x2)
+		printf("%u:%u\n", major(st1.st_dev), minor(st1.st_dev));
+	toys.exitval = res ? 0 : 1;
+}