zircon/third_party/ulib/musl/src/stdio/fileno.c

#include "stdio_impl.h"

int fileno(FILE* f) {
  /* f->fd never changes, but the lock must be obtained and released
   * anyway since this function cannot return while another thread
   * holds the lock. */
  FLOCK(f);
  FUNLOCK(f);
  return f->fd;
}

weak_alias(fileno, fileno_unlocked);