02-05-2019
I'm lost.
Are you saying that you're using a shell where the string
%{http_code} sometimes expands to one of the strings
200,
%{200},
%200, or
{200}?
If so, which one?
And, if so, isn't there something equivalent to the
test utility in that shell that you can use to determine whether or not
%{http_code} expands to the undesired string before you start the
curl in the background instead of trying to kill it off after it has been started?
What operating system and shell are you using?
What shell will you be using to try to detect whether or not these bad forms of background jobs are running.?
Doesn't the operating system you're using have a
ps command that can be used to display the command line arguments being used by running processes?
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LEARN ABOUT MOJAVE
curlopt_tcp_keepidle
CURLOPT_TCP_KEEPIDLE(3) curl_easy_setopt options CURLOPT_TCP_KEEPIDLE(3)
NAME
CURLOPT_TCP_KEEPIDLE - set TCP keep-alive idle time wait
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TCP_KEEPIDLE, long delay);
DESCRIPTION
Pass a long. Sets the delay, in seconds, that the operating system will wait while the connection is idle before sending keepalive probes.
Not all operating systems support this option.
DEFAULT
60
PROTOCOLS
All
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
/* enable TCP keep-alive for this transfer */
curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
/* set keep-alive idle time to 120 seconds */
curl_easy_setopt(curl, CURLOPT_TCP_KEEPIDLE, 120L);
/* interval time between keep-alive probes: 60 seconds */
curl_easy_setopt(curl, CURLOPT_TCP_KEEPINTVL, 60L);
curl_easy_perform(curl);
}
AVAILABILITY
Added in 7.25.0
RETURN VALUE
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSO
CURLOPT_TCP_KEEPALIVE(3), CURLOPT_TCP_KEEPINTVL(3),
libcurl 7.54.0 January 02, 2017 CURLOPT_TCP_KEEPIDLE(3)