On Wed, 12 Jun 2013 13:36:17 -0400, Jérôme M. Berger <jeber...@free.fr>
wrote:
Denis Koroskin wrote:
The best solution would be for writeln() to throw on use, and I
think it's fairly easy to implement: just flush once after using
the file descriptor for the first time, and throw if it fails.
While it doesn't cover a case where file descriptor becomes
non-writable during the program lifetime, it covers the most
common case of file descriptor not being writable at all.
Actually, the best solution is to check if the file is writable
before writing and *without flushing*. On Posix systems, this can be
done with:
fcntl (fd, F_GETFL) & W_OK
This is probably the better answer.
You only have to do that with FILE * initialized with fdopen.
-Steve
