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multi: fix multi_wait() timeout handling

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- determine the actual poll timeout *after* all sockets
  have been collected. Protocols and connection filters may
  install new timeouts during collection.
- add debug logging to test1533 where the mistake was noticed

Reported-by: Matt Jolly
Fixes #13782
Closes #13825
This commit is contained in:
Stefan Eissing 2024-05-29 17:13:34 +02:00 • committed by Daniel Stenberg
parent 3b9569c3e2
commit c8096668ae
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GPG key ID: 5CC908FDB71E12C2
3 changed files with 16 additions and 8 deletions
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15
lib/multi.c
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@ -1366,13 +1366,6 @@ static CURLMcode multi_wait(struct Curl_multi *multi,
if(timeout_ms < 0)
return CURLM_BAD_FUNCTION_ARGUMENT;
/* If the internally desired timeout is actually shorter than requested from
the outside, then use the shorter time! But only if the internal timer
is actually larger than -1! */
(void)multi_timeout(multi, &timeout_internal);
if((timeout_internal >= 0) && (timeout_internal < (long)timeout_ms))
timeout_ms = (int)timeout_internal;
memset(ufds, 0, ufds_len * sizeof(struct pollfd));
memset(&ps, 0, sizeof(ps));
@ -1476,6 +1469,14 @@ static CURLMcode multi_wait(struct Curl_multi *multi,
#endif
#endif
/* We check the internal timeout *AFTER* we collected all sockets to
* poll. Collecting the sockets may install new timers by protocols
* and connection filters.
* Use the shorter one of the internal and the caller requested timeout. */
(void)multi_timeout(multi, &timeout_internal);
if((timeout_internal >= 0) && (timeout_internal < (long)timeout_ms))
timeout_ms = (int)timeout_internal;
#if defined(ENABLE_WAKEUP) && defined(USE_WINSOCK)
if(nfds || use_wakeup) {
#else