[Bug 225588] Re: qcomicbook hangs when opening zip archives

[JRavasi]

I can reproduce it here. It seems at least two bugs, one in Qt4 and
another in qcomicbook.

The main GUI thread hangs in src/imgarchivesink.cpp,
QComicBook::ImgArchiveSink::extract(const QString &, const QString &,
ArchiveType), around line 221:

	extcnt = 0;
	pext->start(extprg, extargs);
	if (!pext->waitForFinished(5000))
		return SINKERR_ARCHEXIT;

pext is a QProcess*. The unzip command is executed, but the call to
waitForFinished() never returns. Instead, it hangs in an infinite
select(), that is, no file descriptors to monitor and infinite timeout.
This happens *after* the command is executed and the zip is decompressed
in /tmp. Whatever happens, Qt should not run a select() without any file
descriptors to monitor.

The qcomicbook bug is that, according to Qt4 documentation, QProcess
should not be used from the GUI thread.

-- 
qcomicbook hangs when opening zip archives
https://bugs.launchpad.net/bugs/225588
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