Add file and directory creation, mkdir

src/user/app/mkdir/mkdir.c

@@ -0,0 +1,28 @@
+#include "src/lib/syscall.h"
+#include "src/lib/util.h"
+#include "src/user/syscall.h"
+#include <stdint.h>
+
+#define BLOCK_SIZE 65536
+
+#define PRINT_S(s) write(1, s, sizeof(s) - 1);
+#define PRINT_D(s) write(1, s, string_length(s));
+
+exit_code_t main(uint64_t argc, const char **argv) {
+  if (argc < 2) {
+    PRINT_S("mkdir: requires target(s)\n");
+    return EXIT_CODE_GENERAL_FAILURE;
+  }
+
+  for (uint64_t i = 1; i < argc; i++) {
+    uint64_t fd = open(argv[i], OPEN_DIRECTORY | OPEN_CREATE | OPEN_EXCLUSIVE);
+    if (fd == (uint64_t)-1) {
+      PRINT_S("mkdir: could not create directory\n");
+      return EXIT_CODE_GENERAL_FAILURE;
+    } else {
+      close(fd);
+    }
+  }
+
+  return EXIT_CODE_OK;
+}