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Retry pselect on EINTR - #344
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The Go runtime may send signals to pause goroutines and these signals can interrupt pselect6. When this happens, the syscall returns EINTR. This change handles that case by retrying pselect6 on EINTR. The same approach is used by the mdlayher/socket library for sendmsg/recvmsg operations: https://github.com/mdlayher/socket/blob/8e6558649a7bd11ca1bd2b82c45fc96dee4dc11d/conn.go#L871.
stapelberg
approved these changes
Nov 18, 2025
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The Go runtime may send signals to pause goroutines and these signals can interrupt pselect6. When this happens, the syscall returns EINTR. This change handles that case by retrying pselect6 on EINTR. The same approach is used by the mdlayher/socket library for sendmsg/recvmsg operations:
https://github.com/mdlayher/socket/blob/8e6558649a7bd11ca1bd2b82c45fc96dee4dc11d/conn.go#L871.
Should fix the bug spotted on #339. I tested by doing something like this:
and simultaneously using
tail -f, looking for keywords on the file. It seems that very rarely ( maybe 5% of time time ) the exact same test would fail because of EINTR.