[gnurl] 212/282: multi_wait: stop loop when sread() returns zero

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commit cf7760ab521d1f9fc6a526df7dedfb7b0c3a6f17
Author: Daniel Stenberg <address@hidden>
AuthorDate: Mon Mar 2 10:38:53 2020 +0100

    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
---
 lib/multi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/multi.c b/lib/multi.c
index ef86f7c22..cef2805c8 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -1199,7 +1199,7 @@ static CURLMcode Curl_multi_wait(struct Curl_multi *multi,
                data from it until it receives an error (except EINTR).
                In normal cases it will get EAGAIN or EWOULDBLOCK
                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
               if(EINTR == SOCKERRNO)
                 continue;

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