[pulseaudio-tickets] [Bug 45044] New: pa_mainloop should report POLLNVAL when that occurs with IO events

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=45044

             Bug #: 45044
           Summary: pa_mainloop should report POLLNVAL when that occurs
                    with IO events
    Classification: Unclassified
           Product: PulseAudio
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: core
        AssignedTo: pulseaudio-bugs at lists.freedesktop.org
        ReportedBy: tanuk at iki.fi
         QAContact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net


poll() may return POLLNVAL in revents, but pa_mainloop ignores that. According
to "man poll", POLLNVAL signals an "invalid request: fd not open (output
only)". I'm not sure how that should be interpreted: if we never call poll() on
an fd that we have closed ourselves, is it guaranteed that POLLNVAL will never
occur? If so, we could have an assertion for that in map_flags_from_libc(). Or
probably not: pa_mainloop can also be used by clients, and they may not be as
careful with their file descriptors.

As proposed by Arun, I think we should add PA_IO_EVENT_INVALID to
pa_io_event_flags_t.

Discussion:
http://lists.freedesktop.org/archives/pulseaudio-discuss/2011-December/012517.html

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