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Lines 821-827
unlocked_error:
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|
| 821 |
} |
821 |
} |
| 822 |
} |
822 |
} |
| 823 |
|
823 |
|
| 824 |
if ((rpipe->pipe_buffer.size - rpipe->pipe_buffer.cnt) >= PIPE_BUF) |
824 |
/* |
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|
825 |
* Only wake up writers if there was actually something read. |
| 826 |
* Otherwise, when calling read(2) at EOF, pipeselwakeup would |
| 827 |
* re-trigger EVFILT_READ/EV_EOF notifications that might have just |
| 828 |
* been cleared with EV_CLEAR, resulting in an infinite loop (see PR |
| 829 |
* 203366): |
| 830 |
* |
| 831 |
* kevent(4,...,{ 3,EVFILT_READ,EV_CLEAR|EV_EOF,...},1,0x0) = 1 (0x1) |
| 832 |
* read(3,...,4096) = 0 (0x0) |
| 833 |
* kevent(4,...,{ 3,EVFILT_READ,EV_CLEAR|EV_EOF,...},1,0x0) = 1 (0x1) |
| 834 |
* ... |
| 835 |
*/ |
| 836 |
if (nread > 0 && |
| 837 |
(rpipe->pipe_buffer.size - rpipe->pipe_buffer.cnt) >= PIPE_BUF) |
| 825 |
pipeselwakeup(rpipe); |
838 |
pipeselwakeup(rpipe); |
| 826 |
|
839 |
|
| 827 |
PIPE_UNLOCK(rpipe); |
840 |
PIPE_UNLOCK(rpipe); |