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Full Discussion: Truss output interpretation
Top Forums UNIX for Advanced & Expert Users Truss output interpretation Post 302921541 by Don Cragun on Saturday 18th of October 2014 03:39:16 AM
Old 10-18-2014
OK. So you're sending a request to a server on a socket and immediately after sending the request, you try to read a response from the server with NDELAY set in the socket options. There is no server and no network that can respond that fast to a request.

There are a couple of obvious things you could try:
  1. Drop the TCP_NDELAY socket option so the read() will wait for data instead of returning immediately if no data is present.
  2. Drop the 1st read() and start with the poll() or pollsys() to wait for data to be present before attempting the read().
I haven't tried to evaluate the arguments to pollsys() to see if your program is waiting for data on a group of file descriptors or just waiting for data on fd #4. If it is just waiting for data on fd #4, I would start by trying #1; but if your program can continue processing if data is available on another file descriptor as well, choose option 2.

With what you have shown us there is no way for us to guess why it is taking more than 24 seconds for the server to respond to your request.
 

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CURLOPT_CUSTOMREQUEST(3)				     curl_easy_setopt options					  CURLOPT_CUSTOMREQUEST(3)

NAME
CURLOPT_CUSTOMREQUEST - custom string for request SYNOPSIS
#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CUSTOMREQUEST, char *request); DESCRIPTION
Pass a pointer to a zero terminated string as parameter. When you change the request method by setting CURLOPT_CUSTOMREQUEST(3) to something, you don't actually change how libcurl behaves or acts in regards to the particular request method, it will only change the actual string sent in the request. Restore to the internal default by setting this to NULL. This option can be used to specify the request: HTTP Instead of GET or HEAD when performing HTTP based requests. This is particularly useful, for example, for performing a HTTP DELETE request. For example: When you tell libcurl to do a HEAD request, but then specify a GET though a custom request libcurl will still act as if it sent a HEAD. To switch to a proper HEAD use CURLOPT_NOBODY(3), to switch to a proper POST use CURLOPT_POST(3) or CURLOPT_POSTFIELDS(3) and to switch to a proper GET use CURLOPT_HTTPGET(3). Many people have wrongly used this option to replace the entire request with their own, including multiple headers and POST con- tents. While that might work in many cases, it will cause libcurl to send invalid requests and it could possibly confuse the remote server badly. Use CURLOPT_POST(3) and CURLOPT_POSTFIELDS(3) to set POST data. Use CURLOPT_HTTPHEADER(3) to replace or extend the set of headers sent by libcurl. Use CURLOPT_HTTP_VERSION(3) to change HTTP version. FTP Instead of LIST and NLST when performing FTP directory listings. IMAP Instead of LIST when issuing IMAP based requests. POP3 Instead of LIST and RETR when issuing POP3 based requests. For example: When you tell libcurl to use a custom request it will behave like a LIST or RETR command was sent where it expects data to be returned by the server. As such CURLOPT_NOBODY(3) should be used when specifying commands such as DELE and NOOP for example. SMTP Instead of a HELP or VRFY when issuing SMTP based requests. For example: Normally a multiline response is returned which can be used, in conjunction with CURLOPT_MAIL_RCPT(3), to specify an EXPN request. If the CURLOPT_NOBODY(3) option is specified then the request can be used to issue NOOP and RSET commands. The application does not have to keep the string around after setting this option. DEFAULT
NULL PROTOCOLS
HTTP, FTP, IMAP, POP3 and SMTP EXAMPLE
TODO AVAILABILITY
IMAP is supported since 7.30.0, POP3 since 7.26.0 and SMTP since 7.34.0. RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space. SEE ALSO
CURLOPT_HTTPHEADER(3), CURLOPT_NOBODY(3), libcurl 7.54.0 December 21, 2016 CURLOPT_CUSTOMREQUEST(3)
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