text: #include "stdio_impl.h"
  
  #undef ferror
  
  int ferror(FILE* f) {
    FLOCK(f);
    int ret = !!(f->flags & F_ERR);
    FUNLOCK(f);
    return ret;
  }
  
  weak_alias(ferror, ferror_unlocked);
  weak_alias(ferror, _IO_ferror_unlocked);
  