On 11/08/11 02:10, Alex Rousskov wrote:
On 08/09/2011 06:34 PM, Amos Jeffries wrote:
On Tue, 09 Aug 2011 12:56:09 -0600, Alex Rousskov wrote:
On 08/09/2011 02:13 AM, Kinkie wrote:
./cf_gen cf.data ../../src/cf.data.depend
error while opening input file 'cf.data': Unknown error: 0
Now this puzzles me.
ifstream fp.bad() reports badbits set, but errno is OK. On FreeBSD
6.4 only.
Perhaps the errno is reset by subsequent system calls? How close is your
bad() detection to the errno use?
The code in question is:
fp.open(type_depend, std::ifstream::in);
if (fp.fail()) {
std::cerr<< "error while opening type dependencies file '"<<
input_filename<< "': "<< strerror(errno)<< std::endl;
exit(1);
}
Does rewriting the above to preserve errno (as in the sketch below) help?
fp.open(...);
if (!fp) {
const int savedErrno = errno;
std::cerr<< "error: "<< strerror(errno)<< std::endl;
}
Cheers,
Alex.
Neither of those worked in any combination.
But....
looking at the snippet I see type_depends being opened and
input_filename being reported. So fix that typo and look for
input_filename being opened.
... which shows that fp is re-used between the two files.
Adding fp.clear() to reset the flags (including EOF?) after the
fp.close() solves it.
Amos
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