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23 .TH curl_easy_send 3 "December 18, 2016" "libcurl 7.59.0" "libcurl Manual"
26 curl_easy_send - sends raw data over an "easy" connection
28 .B #include <curl/easy.h>
30 .BI "CURLcode curl_easy_send( CURL *" curl ", const void *" buffer ","
31 .BI " size_t " buflen ", size_t *" n ");"
34 This function sends arbitrary data over the established connection. You may
35 use it together with \fIcurl_easy_recv(3)\fP to implement custom protocols
36 using libcurl. This functionality can be particularly useful if you use
37 proxies and/or SSL encryption: libcurl will take care of proxy negotiation and
40 \fBbuffer\fP is a pointer to the data of length \fBbuflen\fP that you want sent.
41 The variable \fBn\fP points to will receive the number of sent bytes.
43 To establish the connection, set \fICURLOPT_CONNECT_ONLY(3)\fP option before
44 calling \fIcurl_easy_perform(3)\fP or \fIcurl_multi_perform(3)\fP. Note that
45 \fIcurl_easy_send(3)\fP will not work on connections that were created without
48 The call will return \fBCURLE_AGAIN\fP if it's not possible to send data right
49 now - the socket is used in non-blocking mode internally. When
50 \fBCURLE_AGAIN\fP is returned, use your operating system facilities like
51 \fIselect(2)\fP to wait until the socket is writable. The socket may be
52 obtained using \fIcurl_easy_getinfo(3)\fP with \fICURLINFO_ACTIVESOCKET(3)\fP.
54 Furthermore if you wait on the socket and it tells you it's writable,
55 \fIcurl_easy_send(3)\fP may return \fBCURLE_AGAIN\fP if the only data that was
56 sent was for internal SSL processing, and no other data could be sent.
61 On success, returns \fBCURLE_OK\fP and stores the number of bytes actually
62 sent into \fB*n\fP. Note that this may very well be less than the amount you
65 On failure, returns the appropriate error code.
67 This function may return \fBCURLE_AGAIN\fP. In this case, use your operating
68 system facilities to wait until the socket is writable, and retry.
70 If there's no socket available to use from the previous transfer, this function
71 returns \fBCURLE_UNSUPPORTED_PROTOCOL\fP.
73 See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example.
75 .BR curl_easy_setopt "(3), " curl_easy_perform "(3), " curl_easy_getinfo "(3), "
76 .BR curl_easy_recv "(3) "