mirror of https://github.com/curl/curl.git synced 2024-12-09 06:30:06 +08:00

Daniel Stenberg e3fe020089

docs/libcurl: generate PROTOCOLS from meta-data

Remove the PROTOCOLS section from the source files completely and
instead generate them based on the header data in the curldown files.

It also generates TLS backend information for options marked for TLS as
protocol.

Closes #13175

2024-03-23 18:13:03 +01:00

2.4 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

curl

CURLOPT_TIMEOUT

libcurl

CURLOPT_CONNECTTIMEOUT (3)

CURLOPT_LOW_SPEED_LIMIT (3)

CURLOPT_TCP_KEEPALIVE (3)

CURLOPT_TIMEOUT_MS (3)

All

NAME

CURLOPT_TIMEOUT - maximum time the transfer is allowed to complete

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TIMEOUT, long timeout);

DESCRIPTION

Pass a long as parameter containing timeout - the maximum time in seconds that you allow the entire transfer operation to take. The whole thing, from start to end. Normally, name lookups can take a considerable time and limiting operations risk aborting perfectly normal operations.

CURLOPT_TIMEOUT_MS(3) is the same function but set in milliseconds.

If both CURLOPT_TIMEOUT(3) and CURLOPT_TIMEOUT_MS(3) are set, the value set last is used.

Since this option puts a hard limit on how long time a request is allowed to take, it has limited use in dynamic use cases with varying transfer times. That is especially apparent when using the multi interface, which may queue the transfer, and that time is included. You are advised to explore CURLOPT_LOW_SPEED_LIMIT(3), CURLOPT_LOW_SPEED_TIME(3) or using CURLOPT_PROGRESSFUNCTION(3) to implement your own timeout logic.

The connection timeout set with CURLOPT_CONNECTTIMEOUT(3) is included in this general all-covering timeout.

With CURLOPT_CONNECTTIMEOUT(3) set to 3 and CURLOPT_TIMEOUT(3) set to 5, the operation can never last longer than 5 seconds.

With CURLOPT_CONNECTTIMEOUT(3) set to 4 and CURLOPT_TIMEOUT(3) set to 2, the operation can never last longer than 2 seconds.

This option may cause libcurl to use the SIGALRM signal to timeout system calls on builds not using asynch DNS. In unix-like systems, this might cause signals to be used unless CURLOPT_NOSIGNAL(3) is set.

DEFAULT

Default timeout is 0 (zero) which means it never times out during transfer.

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

    /* complete within 20 seconds */
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 20L);

    curl_easy_perform(curl);
  }
}

AVAILABILITY

Always

RETURN VALUE

Returns CURLE_OK. Returns CURLE_BAD_FUNCTION_ARGUMENT if set to a negative value or a value that when converted to milliseconds is too large.

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