Further improve cocmd interpreter

libc/calls/mkdir.c

@@ -17,12 +17,7 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/calls/calls.h"
-#include "libc/dce.h"
-#include "libc/nt/files.h"
-#include "libc/nt/runtime.h"
-#include "libc/str/str.h"
 #include "libc/sysv/consts/at.h"
-#include "libc/sysv/errfuns.h"
 
 /**
  * Creates directory a.k.a. folder.
@@ -36,9 +31,21 @@
  * @param path is a UTF-8 string, preferably relative w/ forward slashes
  * @param mode can be, for example, 0755
  * @return 0 on success or -1 w/ errno
- * @error ENAMETOOLONG if >246 characters on NT
+ * @raise EEXIST if named file already exists
+ * @raise ENOTDIR if directory component in `path` existed as non-directory
+ * @raise ENAMETOOLONG if symlink-resolved `path` length exceeds `PATH_MAX`
+ * @raise ENAMETOOLONG if component in `path` exists longer than `NAME_MAX`
+ * @raise EROFS if parent directory is on read-only filesystem
+ * @raise ENOSPC if file system or parent directory is full
+ * @raise EACCES if write permission was denied on parent directory
+ * @raise EACCES if search permission was denied on component in `path`
+ * @raise ENOENT if a component within `path` didn't exist
+ * @raise ENOENT if `path` is an empty string
+ * @raise ELOOP if loop was detected resolving components of `path`
+ * @see makedirs() which is higher-level
+ * @see mkdirat() for modern call
  * @asyncsignalsafe
- * @see makedirs()
+ * @threadsafe
  */
 int mkdir(const char *path, unsigned mode) {
   return mkdirat(AT_FDCWD, path, mode);