aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
-rw-r--r--toys/mountpoint.c56
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;
+}