Dan Gohman 5a7ba74c19 Avoid calling poll_oneoff with zero subscriptions. (#162) ... * Avoid calling `poll_oneoff` with zero subscriptions. With https://github.com/WebAssembly/WASI/pull/193 merged, WASI is moving to make `poll_oneoff` with no arguments an error. Even though that's in ephemeral and not yet in a snapshot, we can start to anticipate it in libc: - Remove the `pause` function, since WASI has no signals and thus no way to ever wake it up short of having the host terminate it. - Make `poll` and `pselect` return `ENOTSUP` in the case of having no events to wait for. * Remove `pause` from the defined-symbols.txt list. * Fix __wasilibc_unmodified_upstream markers. * Check for zero subscriptions, rather than zero events. Make `poll` and `pselect` return `ENOTSUP` when asked to poll on zero subscriptions, rather than when the systerm returns zero events. While here, drop the `__wasilibc_unmodified_upstream` markers, which were already pretty noisy here, and would be significantly worse with this change. * Add comments about the subtle relationship between nfds and nsubscriptions. * Rewrite the comment. * Fix code quotes.		2020-06-01 19:00:30 -07:00
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src	Avoid calling poll_oneoff with zero subscriptions. (#162)	2020-06-01 19:00:30 -07:00
LICENSE	WASI libc prototype implementation.	2019-03-27 07:59:55 -07:00