1curl_easy_send(3)               libcurl Manual               curl_easy_send(3)
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NAME

6       curl_easy_send - sends raw data over an "easy" connection
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SYNOPSIS

9       #include <curl/easy.h>
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11       CURLcode  curl_easy_send(  CURL  *curl, const void *buffer,  size_t bu‐
12       flen, size_t *n);
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DESCRIPTION

15       This function sends arbitrary data over the established connection. You
16       may  use  it together with curl_easy_recv(3) to implement custom proto‐
17       cols using libcurl. This functionality can be  particularly  useful  if
18       you  use proxies and/or SSL encryption: libcurl will take care of proxy
19       negotiation and connection set-up.
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21       buffer is a pointer to the data of length buflen that  you  want  sent.
22       The variable n points to will receive the number of sent bytes.
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24       To  establish the connection, set CURLOPT_CONNECT_ONLY(3) option before
25       calling  curl_easy_perform(3)  or  curl_multi_perform(3).   Note   that
26       curl_easy_send(3)  will not work on connections that were created with‐
27       out this option.
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29       The call will return CURLE_AGAIN if it's  not  possible  to  send  data
30       right  now  -  the socket is used in non-blocking mode internally. When
31       CURLE_AGAIN is returned, use your operating system facilities like  se‐
32       lect(2)  to  wait  until  the socket is writable. The socket may be ob‐
33       tained using curl_easy_getinfo(3) with CURLINFO_ACTIVESOCKET(3).
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35       Furthermore if you wait on the socket and it tells you  it's  writable,
36       curl_easy_send(3) may return CURLE_AGAIN if the only data that was sent
37       was for internal SSL processing, and no other data could be sent.
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AVAILABILITY

41       Added in 7.18.2.
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RETURN VALUE

44       On success, returns CURLE_OK and stores the number  of  bytes  actually
45       sent  into *n. Note that this may very well be less than the amount you
46       wanted to send.
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48       On failure, returns the appropriate error code.
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50       This function may return CURLE_AGAIN. In this case, use your  operating
51       system facilities to wait until the socket is writable, and retry.
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53       If  there's no socket available to use from the previous transfer, this
54       function returns CURLE_UNSUPPORTED_PROTOCOL.
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EXAMPLE

57       See sendrecv.c in docs/examples directory for usage example.
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SEE ALSO

60       curl_easy_setopt(3),    curl_easy_perform(3),     curl_easy_getinfo(3),
61       curl_easy_recv(3)
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65libcurl 7.76.1                 November 05, 2020             curl_easy_send(3)
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