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pipefs: make poll better

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Matheus
2024-06-23 18:13:16 -03:00
parent 017948a1aa
commit ad06298ab8
1 changed files with 3 additions and 1 deletions
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kernel-src/fs/pipefs.c
+3 -1
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@@ -73,7 +73,9 @@ static int internalpoll(vnode_t *node, polldata_t *data, int events) {
events |= POLLERR; events |= POLLERR;
if (pipenode->readers == 0) if (pipenode->readers == 0)
revents |= POLLERR; revents |= POLLERR;
else if (RINGBUFFER_DATACOUNT(&pipenode->data) < BUFFER_SIZE) // poll will only return POLLOUT if an atomic write can be done without blocking
// this is undocumented in POSIX but many unices implement it like this
else if (RINGBUFFER_DATACOUNT(&pipenode->data) < BUFFER_SIZE - PIPE_ATOMIC_SIZE)
revents |= POLLOUT; revents |= POLLOUT;
} }