Adding mknod

1 files changed, 51 insertions, 0 deletions

diff --git a/toys/mknod.c b/toys/mknod.c
new file mode 100644
index 00000000..fb727bc3
--- /dev/null
+++ b/toys/mknod.c
@@ -0,0 +1,51 @@
+/* vi: set sw=4 ts=4:
+ *
+ * mknod.c - make block or character special file
+ *
+ * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
+ *
+ * Not in SUSv3.
+
+USE_MKNOD(NEWTOY(mknod, "<2>4", TOYFLAG_BIN))
+
+config MKNOD
+	bool "mknod"
+	default y
+	help
+	  usage: mknod NAME TYPE [MAJOR MINOR]
+
+	  Create a special file NAME with a given type, possible types are
+	  b       create a block device with the given MAJOR/MINOR
+	  c or u  create a character device with the given MAJOR/MINOR
+	  p       create a named pipe ignoring MAJOR/MINOR
+*/
+
+#include "toys.h"
+
+static const char modes_char[] = {'p', 'c', 'u', 'b'};
+static const mode_t modes[] = {S_IFIFO, S_IFCHR, S_IFCHR, S_IFBLK};
+
+void mknod_main(void)
+{
+	int major=0, minor=0, type;
+	char * tmp;
+	int mode = 0660;
+
+	tmp = strchr(modes_char, toys.optargs[1][0]);
+	if (!tmp)
+		perror_exit("unknown special device type %c", toys.optargs[1][0]);
+
+	type = modes[tmp-modes_char];
+
+	if (type == S_IFCHR || type == S_IFBLK) {
+                if (toys.optc != 4)
+                    perror_exit("creating a block/char device requires major/minor");
+
+		major = atoi(toys.optargs[2]);
+		minor = atoi(toys.optargs[3]);
+	}
+
+	if (mknod(toys.optargs[0], mode | type, makedev(major, minor)))
+		perror_exit("mknod %s failed", toys.optargs[0]);
+
+}