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Curl_wait_for_resolv() could hang due to the bad timeout timer resolution and

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some bad thinking on my part.
This commit is contained in:
Daniel Stenberg 2004-04-14 11:43:26 +00:00
parent b83d8104cd
commit 1d0b5b507a
1 changed files with 13 additions and 3 deletions
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16
lib/hostip.c
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@ -621,6 +621,14 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
else if(conn->data->set.timeout)
timeout = conn->data->set.timeout;
/* We convert the number of seconds into number of milliseconds here: */
if(timeout < 2147483)
/* maximum amount of seconds that can be multiplied with 1000 and
still fit within 31 bits */
timeout *= 1000;
else
timeout = 0x7fffffff; /* ridiculous amount of time anyway */
/* Wait for the name resolve query to complete. */
while (1) {
int nfds=0;
@ -628,9 +636,10 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
struct timeval *tvp, tv, store;
int count;
struct timeval now = Curl_tvnow();
long timediff;
store.tv_sec = (int)timeout;
store.tv_usec = 0;
store.tv_sec = (int)timeout/1000;
store.tv_usec = (timeout%1000)*1000;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
@ -645,7 +654,8 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
ares_process(data->state.areschannel, &read_fds, &write_fds);
timeout -= Curl_tvdiff(Curl_tvnow(), now)/1000; /* spent time */
timediff = Curl_tvdiff(Curl_tvnow(), now); /* spent time */
timeout -= timediff?timediff:1; /* always deduct at least 1 */
if (timeout < 0) {
/* our timeout, so we cancel the ares operation */
ares_cancel(data->state.areschannel);