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multi_wait: stop loop when sread() returns zero

It's unclear why it would ever return zero here, but this change fixes
Robert's problem and it shouldn't loop forever...

Reported-by: Robert Dunaj
Bug: https://curl.haxx.se/mail/archive-2020-02/0011.html
Closes #5019
This commit is contained in:
Daniel Stenberg 2020-03-02 10:38:53 +01:00
parent 0caae3c4be
commit cf7760ab52
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@ -1199,7 +1199,7 @@ static CURLMcode Curl_multi_wait(struct Curl_multi *multi,
data from it until it receives an error (except EINTR). data from it until it receives an error (except EINTR).
In normal cases it will get EAGAIN or EWOULDBLOCK In normal cases it will get EAGAIN or EWOULDBLOCK
when there is no more data, breaking the loop. */ when there is no more data, breaking the loop. */
if(sread(multi->wakeup_pair[0], buf, sizeof(buf)) < 0) { if(sread(multi->wakeup_pair[0], buf, sizeof(buf)) <= 0) {
#ifndef USE_WINSOCK #ifndef USE_WINSOCK
if(EINTR == SOCKERRNO) if(EINTR == SOCKERRNO)
continue; continue;