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socks: Fix blocking timeout logic
- Document in Curl_timeleft's comment block that returning 0 signals no timeout (ie there's infinite time left). - Fix SOCKS' Curl_blockread_all for the case when no timeout was set. Prior to this change if the timeout had a value of 0 and that was passed to SOCKET_READABLE it would return right away instead of blocking. That was likely because it was not well understood that when Curl_timeleft returns 0 it is not a timeout of 0 ms but actually means no timeout. Ref: https://github.com/curl/curl/pull/5214#issuecomment-612512360 Closes https://github.com/curl/curl/pull/5220
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@ -171,7 +171,8 @@ singleipconnect(struct connectdata *conn,
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/*
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/*
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* Curl_timeleft() returns the amount of milliseconds left allowed for the
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* Curl_timeleft() returns the amount of milliseconds left allowed for the
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* transfer/connection. If the value is negative, the timeout time has already
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* transfer/connection. If the value is 0, there's no timeout (ie there's
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* infinite time left). If the value is negative, the timeout time has already
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* elapsed.
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* elapsed.
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*
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*
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* The start time is stored in progress.t_startsingle - as set with
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* The start time is stored in progress.t_startsingle - as set with
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10
lib/socks.c
10
lib/socks.c
@ -62,15 +62,15 @@ int Curl_blockread_all(struct connectdata *conn, /* connection data */
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int result;
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int result;
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*n = 0;
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*n = 0;
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for(;;) {
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for(;;) {
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timediff_t timeleft = Curl_timeleft(conn->data, NULL, TRUE);
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timediff_t timeout_ms = Curl_timeleft(conn->data, NULL, TRUE);
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if(timeleft < 0) {
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if(timeout_ms < 0) {
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/* we already got the timeout */
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/* we already got the timeout */
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result = CURLE_OPERATION_TIMEDOUT;
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result = CURLE_OPERATION_TIMEDOUT;
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break;
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break;
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}
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}
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if(timeleft > TIME_T_MAX)
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if(!timeout_ms || timeout_ms > TIME_T_MAX)
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timeleft = TIME_T_MAX;
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timeout_ms = TIME_T_MAX;
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if(SOCKET_READABLE(sockfd, (time_t)timeleft) <= 0) {
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if(SOCKET_READABLE(sockfd, (time_t)timeout_ms) <= 0) {
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result = ~CURLE_OK;
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result = ~CURLE_OK;
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break;
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break;
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}
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}
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