11-02-2012
You are running curl in the background. It runs independently -- ergo, it prints when it pleases. Whether it will print lines precisely when you want it to is entirely coincidental. It could even print overtop of other lines sometimes but probably not all the time.
This is not a bug. This is just because you have no control over the order they print.
If you must run them in parallel, each instance of curl should write to its own logfile, IMHO. You can merge them after they're finished but not before.
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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)