Add fixes performance and static web server

libc/calls/open.c

@@ -35,7 +35,7 @@
  * @param mode is an octal user/group/other permission signifier, that's
  *     ignored if O_CREAT or O_TMPFILE weren't passed
  * @return number needing close(), or -1 w/ errno
- * @asyncsignalsafe
+ * @note don't call open() from signal handlers
  */
 nodiscard int open(const char *file, int flags, ...) {
   va_list va;