1 files changed, 46 insertions, 0 deletions
diff --git a/findmount.c b/findmount.c
new file mode 100644
index 0000000..26e28fc
--- /dev/null
+++ b/findmount.c
@@ -0,0 +1,46 @@
+#include "internal.h"
+#include <stdio.h>
+#include <mntent.h>
+#include <sys/stat.h>
+
+/*
+ * Given a block device, find the mount table entry if that block device
+ * is mounted.
+ *
+ * Given any other file (or directory), find the mount table entry for its
+ * filesystem.
+ */
+extern struct mntent *
+findMountPoint(const char * name, const char * table)
+{
+	struct stat	s;
+	dev_t			mountDevice;
+	FILE *			mountTable;
+	struct mntent *	mountEntry;
+
+	if ( stat(name, &s) != 0 )
+		return 0;
+
+	if ( (s.st_mode & S_IFMT) == S_IFBLK )
+		mountDevice = s.st_rdev;
+	else
+		mountDevice = s.st_dev;
+
+	
+	if ( (mountTable = setmntent(table, "r")) == 0 )
+		return 0;
+
+	while ( (mountEntry = getmntent(mountTable)) != 0 ) {
+		if ( strcmp(name, mountEntry->mnt_dir) == 0
+		 || strcmp(name, mountEntry->mnt_fsname) == 0 )	/* String match. */
+			break;
+		if ( stat(mountEntry->mnt_fsname, &s) == 0
+		 && s.st_rdev == mountDevice )	/* Match the device. */
+				break;
+		if ( stat(mountEntry->mnt_dir, &s) == 0
+		 && s.st_dev == mountDevice )	/* Match the directory's mount point. */
+			break;
+	}
+	endmntent(mountTable);
+	return mountEntry;
+}