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tail: Retry kevent if the system call was interrupted
kevent returns EINTR when I suspend / resume. This causes tail -f and tail -F to exit with interrupt system call. Ignore this error and try kevent again. Sponsored by: Netflix
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@ -411,10 +411,16 @@ follow(file_info_t *files, enum STYLE style, off_t off)
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/*
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* In the -F case we set a timeout to ensure that
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* we re-stat the file at least once every second.
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* If we've recieved EINTR, ignore it. Both reasons
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* for its generation are transient.
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*/
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n = kevent(kq, NULL, 0, ev, 1, Fflag ? &ts : NULL);
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if (n < 0)
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err(1, "kevent");
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do {
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n = kevent(kq, NULL, 0, ev, 1, Fflag ? &ts : NULL);
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if (n < 0 && errno == EINTR)
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continue;
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if (n < 0)
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err(1, "kevent");
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} while (n < 0);
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if (n == 0) {
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/* timeout */
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break;
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