add directory study

study/linux-travel/MINIX-1.5/1.5/Source/commands/mknod.c

@@ -0,0 +1,43 @@
+/* mknod - build a special file		Author: Andy Tanenbaum */
+
+main(argc, argv)
+int argc;
+char *argv[];
+{
+/* mknod name b/c major minor [size] makes a node. */
+
+  int mode, major, minor, dev;
+  unsigned int size;
+
+  if (argc < 5) badcomm();
+  if (*argv[2] != 'b' && *argv[2] != 'c') badcomm();
+  if (*argv[2] == 'c' && argc != 5) badchar();
+  if (*argv[2] == 'b' && argc != 6) badblock();
+  mode = (*argv[2] == 'b' ? 060666 : 020666);
+  major = atoi(argv[3]);
+  minor = atoi(argv[4]);
+  size = (*argv[2] == 'b' ? atoi(argv[5]) : 0);
+  if (major < 0 || minor < 0) badcomm();
+  dev =  (major << 8) | minor;
+  if (mknod(argv[1], mode, dev, size) < 0) perror("mknod");
+  exit(0);
+}
+
+badcomm()
+{
+  std_err("Usage: mknod name b/c major minor [size_in_blocks]\n");
+  exit(1);
+}
+
+badchar()
+{
+  std_err("Usage: mknod name c major minor\n");
+  exit(1);
+}
+
+badblock()
+{
+  std_err("Usage: mknod name b major minor size_in_blocks\n");
+  exit(1);
+}
+