CURLOPT_CONNECTTIMEOUT_MS.md (2418B)
1 --- 2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 SPDX-License-Identifier: curl 4 Title: CURLOPT_CONNECTTIMEOUT_MS 5 Section: 3 6 Source: libcurl 7 See-also: 8 - CURLOPT_LOW_SPEED_LIMIT (3) 9 - CURLOPT_MAX_RECV_SPEED_LARGE (3) 10 - CURLOPT_TIMEOUT_MS (3) 11 Protocol: 12 - All 13 Added-in: 7.16.2 14 --- 15 16 # NAME 17 18 CURLOPT_CONNECTTIMEOUT_MS - timeout for the connect phase 19 20 # SYNOPSIS 21 22 ~~~c 23 #include <curl/curl.h> 24 25 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CONNECTTIMEOUT_MS, 26 long timeout); 27 ~~~ 28 29 # DESCRIPTION 30 31 Pass a long. It sets the maximum time in milliseconds that you allow the 32 connection phase to take. This timeout only limits the connection phase, it 33 has no impact once libcurl has connected. The connection phase includes the 34 name resolve (DNS) and all protocol handshakes and negotiations until there is 35 an established connection with the remote side. 36 37 Set this option to zero to switch to the default built-in connection timeout - 38 300 seconds. See also the CURLOPT_TIMEOUT_MS(3) option. 39 40 CURLOPT_CONNECTTIMEOUT(3) is the same function but set in seconds. 41 42 If both CURLOPT_CONNECTTIMEOUT(3) and CURLOPT_CONNECTTIMEOUT_MS(3) are set, 43 the value set last is used. 44 45 The connection timeout is included in the general all-covering 46 CURLOPT_TIMEOUT_MS(3): 47 48 With CURLOPT_CONNECTTIMEOUT_MS(3) set to 3000 and CURLOPT_TIMEOUT_MS(3) set to 49 5000, the operation can never last longer than 5000 milliseconds, and the 50 connection phase cannot last longer than 3000 milliseconds. 51 52 With CURLOPT_CONNECTTIMEOUT_MS(3) set to 4000 and CURLOPT_TIMEOUT_MS(3) set to 53 2000, the operation can never last longer than 2000 milliseconds. Including 54 the connection phase. 55 56 This option may cause libcurl to use the SIGALRM signal to timeout system 57 calls on builds not using asynch DNS. In Unix-like systems, this might cause 58 signals to be used unless CURLOPT_NOSIGNAL(3) is set. 59 60 # DEFAULT 61 62 300000 63 64 # %PROTOCOLS% 65 66 # EXAMPLE 67 68 ~~~c 69 int main(void) 70 { 71 CURL *curl = curl_easy_init(); 72 if(curl) { 73 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 74 75 /* complete connection within 10000 milliseconds */ 76 curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT_MS, 10000L); 77 78 curl_easy_perform(curl); 79 } 80 } 81 ~~~ 82 83 # %AVAILABILITY% 84 85 # RETURN VALUE 86 87 curl_easy_setopt(3) returns a CURLcode indicating success or error. 88 89 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see 90 libcurl-errors(3).