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https://github.com/topjohnwu/ndk-busybox.git
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ifplugd: use a larger netlink buffer
function old new delta check_existence_through_netlink 310 321 +11 Signed-off-by: Tito Ragusa <farmatito@tiscali.it> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -451,20 +451,24 @@ static smallint detect_link(void)
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static NOINLINE int check_existence_through_netlink(void)
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{
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int iface_len;
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char replybuf[1024];
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/* Buffer was 1K, but on linux-3.9.9 it was reported to be too small.
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* netlink.h: "limit to 8K to avoid MSG_TRUNC when PAGE_SIZE is very large".
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* Note: on error returns (-1) we exit, no need to free replybuf.
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*/
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enum { BUF_SIZE = 8 * 1024 };
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char *replybuf = xmalloc(BUF_SIZE);
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iface_len = strlen(G.iface);
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while (1) {
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struct nlmsghdr *mhdr;
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ssize_t bytes;
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bytes = recv(netlink_fd, &replybuf, sizeof(replybuf), MSG_DONTWAIT);
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bytes = recv(netlink_fd, replybuf, BUF_SIZE, MSG_DONTWAIT);
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if (bytes < 0) {
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if (errno == EAGAIN)
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return G.iface_exists;
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goto ret;
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if (errno == EINTR)
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continue;
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bb_perror_msg("netlink: recv");
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return -1;
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}
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@ -507,6 +511,8 @@ static NOINLINE int check_existence_through_netlink(void)
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}
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}
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ret:
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free(replybuf);
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return G.iface_exists;
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}
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