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35 lines
860 B
C
35 lines
860 B
C
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/* vi: set sw=4 ts=4: */
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/*
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* Utility routines.
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*
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* Copyright (C) 2007 by Denys Vlasenko <vda.linux@googlemail.com>
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*
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* Licensed under GPLv2, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/* Wrapper which restarts poll on EINTR or ENOMEM.
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* On other errors does perror("poll") and returns.
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* Warning! May take longer than timeout_ms to return! */
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int safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout)
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{
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while (1) {
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int n = poll(ufds, nfds, timeout);
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if (n >= 0)
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return n;
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/* Make sure we inch towards completion */
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if (timeout > 0)
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timeout--;
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/* E.g. strace causes poll to return this */
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if (errno == EINTR)
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continue;
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/* Kernel is very low on memory. Retry. */
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/* I doubt many callers would handle this correctly! */
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if (errno == ENOMEM)
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continue;
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bb_perror_msg("poll");
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return n;
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}
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}
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