From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001 From: Andreas Baumann Date: Sat, 3 Jan 2015 13:58:15 +0100 Subject: patch to Vanilla Tomato 1.28 --- release/src/router/busybox/libbb/safe_poll.c | 34 ++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 release/src/router/busybox/libbb/safe_poll.c (limited to 'release/src/router/busybox/libbb/safe_poll.c') diff --git a/release/src/router/busybox/libbb/safe_poll.c b/release/src/router/busybox/libbb/safe_poll.c new file mode 100644 index 00000000..58c7bda5 --- /dev/null +++ b/release/src/router/busybox/libbb/safe_poll.c @@ -0,0 +1,34 @@ +/* vi: set sw=4 ts=4: */ +/* + * Utility routines. + * + * Copyright (C) 2007 by Denys Vlasenko + * + * Licensed under GPLv2, see file LICENSE in this tarball for details. + */ + +#include "libbb.h" + +/* Wrapper which restarts poll on EINTR or ENOMEM. + * On other errors does perror("poll") and returns. + * Warning! May take longer than timeout_ms to return! */ +int FAST_FUNC safe_poll(struct pollfd *ufds, nfds_t nfds, int timeout) +{ + while (1) { + int n = poll(ufds, nfds, timeout); + if (n >= 0) + return n; + /* Make sure we inch towards completion */ + if (timeout > 0) + timeout--; + /* E.g. strace causes poll to return this */ + if (errno == EINTR) + continue; + /* Kernel is very low on memory. Retry. */ + /* I doubt many callers would handle this correctly! */ + if (errno == ENOMEM) + continue; + bb_perror_msg("poll"); + return n; + } +} -- cgit v1.2.3-54-g00ecf