08-16-2009
cURL and cgi
I have a CGI application done in c++ that communicates with PayPal. I've had an issue where the application dies when I try to perform a cURL operation. Upon further inspection it seems that I can run cURL examples from the command line.
Upon even further inspection it seems that I can run cURL in the CGI if I don't set the URL option. Any other option seems to be ok. Of course this fails with an error from cURL saying that the URL was not set. But at least I get to the point of an error.
If I set the URL option it either displays a blank white screen at perform, assuming I print the necessary headers, or it fails with premature end of script headers.
So I'm not a unix guru, and I'm kind of in over my head here, but it is what it is. I'm thinking maybe there's a port blocked that's used by the cgi for outgoing requests that isn't used for the command line. I'm thinking maybe it's a permissions thing. The examples were run as root, and I set the .cgi file to be owned by root, but maybe that doesn't count.
I could really use some direction here. And keep in mind my unix knowledge is not phenominal. I can get around alright, but I need a little help.
I'm running red hat and apache.
Thanks,
Brandon
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LEARN ABOUT PHP
curl_multi_exec
CURL_MULTI_EXEC(3) 1 CURL_MULTI_EXEC(3)
curl_multi_exec - Run the sub-connections of the current cURL handle
SYNOPSIS
int curl_multi_exec (resource $mh, int &$still_running)
DESCRIPTION
Processes each of the handles in the stack. This method can be called whether or not a handle needs to read or write data.
PARAMETERS
o $mh
-A cURL multi handle returned by curl_multi_init(3).
o $still_running
- A reference to a flag to tell whether the operations are still running.
RETURN VALUES
A cURL code defined in the cURL Predefined Constants.
Note
This only returns errors regarding the whole multi stack. There might still have occurred problems on individual transfers even
when this function returns CURLM_OK.
EXAMPLES
Example #1
curl_multi_exec(3) example
This example will create two cURL handles, add them to a multi handle, and then run them in parallel.
<?php
// create both cURL resources
$ch1 = curl_init();
$ch2 = curl_init();
// set URL and other appropriate options
curl_setopt($ch1, CURLOPT_URL, "http://lxr.php.net/");
curl_setopt($ch1, CURLOPT_HEADER, 0);
curl_setopt($ch2, CURLOPT_URL, "http://www.php.net/");
curl_setopt($ch2, CURLOPT_HEADER, 0);
//create the multiple cURL handle
$mh = curl_multi_init();
//add the two handles
curl_multi_add_handle($mh,$ch1);
curl_multi_add_handle($mh,$ch2);
$active = null;
//execute the handles
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
while ($active && $mrc == CURLM_OK) {
if (curl_multi_select($mh) != -1) {
do {
$mrc = curl_multi_exec($mh, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
//close the handles
curl_multi_remove_handle($mh, $ch1);
curl_multi_remove_handle($mh, $ch2);
curl_multi_close($mh);
?>
SEE ALSO
curl_multi_init(3), curl_multi_select(3), curl_exec(3).
PHP Documentation Group CURL_MULTI_EXEC(3)