_IO_file_open
if (!_IO_file_open (this, filename, posix_mode, prot,
_IO_file_open (fp, filename, posix_mode, prot, read_write, is32not64)
libc_hidden_def (_IO_file_open)
result = _IO_file_open (fp, filename, omode|oflags, oprot, read_write,
extern _IO_FILE* _IO_file_open (_IO_FILE *, const char *, int, int, int, int);
libc_hidden_proto (_IO_file_open)