SocketPool+ePoll: retry epoll_wait on EINTR - #223
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epoll_wait returning -1/EINTR means a signal was delivered mid-wait; it is not an error. Treating it as fatal meant any signal (a debugger or strace attach, a timer, SIGCHLD, ...) tore down the whole server with "epoll wait: Interrupted system call". Retry the wait on EINTR instead. errno / EINTR come from libc, which this file did not import (CSystemLinux only exports the epoll/eventfd headers), so import it alongside.
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #223 +/- ##
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Coverage 92.92% 92.92%
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Files 71 71
Lines 3719 3719
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Hits 3456 3456
Misses 263 263 ☔ View full report in Codecov by Harness. |
swhitty
approved these changes
Jul 15, 2026
Owner
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nice, I've merged #224 which now conflicts here; |
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Author
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Ah ok will check. |
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Author
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Closing, this fix is no longer required |
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epoll_wait returning -1/EINTR means a signal was delivered mid-wait; it is not an error. Treating it as fatal means any signal delivered to the process (attaching a debugger/strace, a timer, SIGCHLD, ...) tears down the whole server with
epoll wait: Interrupted system call.Retry the wait on EINTR instead.
errno/EINTRcome from libc, which this file did not import (CSystemLinux only exports the epoll/eventfd headers), so import it alongside — matching the pattern already used inSocket.swift/SocketError.swift.