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| == poll emulation == | | == poll emulation == |
| Many applications that run on systems without poll will attempt to emulate it using the select function.
| | cygwin |
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| A naive emulation works like this:
| | minix |
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| * Map pollfds with POLLIN to select's readfds
| | my dosbox code :( |
| * Map pollfds with POLLOUT to select's writefds
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| * Map pollfds with POLLPRI to select's errorfds
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| * Call select
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| * Map the readfds to the pollfds POLLIN return events
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| * Map the writefds to the pollfds POLLIN return events
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| * Map the errorfds to the pollfds POLLPRI return events
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| This has two problems:
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| * POLLHUP and POLLERR are not returned
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| * pollfds with no events are not mapped at all
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| Usually select will trigger a read event if the socket closes, so POLLHUP can be emulated using a peek. But this doesn't work if a pollfd has no events at all to check.
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| == Conclusions == | | == Conclusions == |