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-rw-r--r--usr/utils/mknod.c84
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);
+}