1 files changed, 84 insertions, 0 deletions
diff --git a/usr/utils/mknod.c b/usr/utils/mknod.c
new file mode 100644
index 0000000..fa7ac7a
--- /dev/null
+++ b/usr/utils/mknod.c
@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+
+char *progname;
+
+static __noreturn usage(void)
+{
+	fprintf(stderr, "Usage: %s [-m mode] name {b|c|p} major minor\n",
+			progname);
+	exit(1);
+}
+
+int main(int argc, char *argv[])
+{
+	char *name, *type, typec, *endp;
+	unsigned int major_num, minor_num;
+	mode_t mode, mode_set = 0;
+	dev_t dev;
+
+	progname = *argv++;
+	if (argc == 1)
+		usage();
+
+	if (argv[0][0] == '-' && argv[0][1] == 'm' && !argv[0][2]) {
+		mode_set = strtoul(argv[1], &endp, 8);
+		argv += 2;
+	}
+
+	name = *argv++;
+	if (!name)
+		usage();
+
+	type = *argv++;
+	if (!type || !type[0] || type[1])
+		usage();
+	typec = type[0];
+
+	mode = 0;
+	switch (typec) {
+	case 'c':
+		mode = S_IFCHR;
+		break;
+	case 'b':
+		mode = S_IFBLK;
+		break;
+	case 'p':
+		mode = S_IFIFO;
+		break;
+	default:
+		usage();
+	}
+
+	if (mode == S_IFIFO) {
+		dev = 0;
+	} else {
+		if (!argv[0] || !argv[1])
+			usage();
+
+		major_num = strtol(*argv++, &endp, 0);
+		if (*endp != '\0')
+			usage();
+		minor_num = strtol(*argv++, &endp, 0);
+		if (*endp != '\0')
+			usage();
+		dev = makedev(major_num, minor_num);
+	}
+
+	if (*argv)
+		usage();
+
+	if (mknod(name, mode|0666, dev) == -1) {
+		perror("mknod");
+		exit(1);
+	}
+
+	if (mode_set && chmod(name, mode_set)) {
+		perror("chmod");
+		exit(1);
+	}
+
+	exit(0);
+}