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91 lines
3.0 KiB
Groff
91 lines
3.0 KiB
Groff
.\" generated by cd2nroff 0.1 from curl_ws_send.md
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.TH curl_ws_send 3 "2024-07-29" libcurl
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.SH NAME
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curl_ws_send \- send WebSocket data
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_ws_send(CURL *curl, const void *buffer, size_t buflen,
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size_t *sent, curl_off_t fragsize,
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unsigned int flags);
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.fi
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.SH DESCRIPTION
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This function call is EXPERIMENTAL.
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Send the specific message fragment over an established WebSocket
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connection. The \fIbuffer\fP holds the data to send and it is \fIbuflen\fP
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number of payload bytes in that memory area.
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\fIsent\fP is returned as the number of payload bytes actually sent.
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To send a (huge) fragment using multiple calls with partial content per
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invoke, set the \fICURLWS_OFFSET\fP bit and the \fIfragsize\fP argument as the
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total expected size for the first part, then set the \fICURLWS_OFFSET\fP with
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a zero \fIfragsize\fP for the following parts.
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If not sending a partial fragment or if this is raw mode, \fIfragsize\fP
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should be set to zero.
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If \fBCURLWS_RAW_MODE\fP is enabled in \fICURLOPT_WS_OPTIONS(3)\fP, the
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\fBflags\fP argument should be set to 0.
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To send a message consisting of multiple frames, set the \fICURLWS_CONT\fP bit
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in all frames except the final one.
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.SH FLAGS
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.IP CURLWS_TEXT
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The buffer contains text data. Note that this makes a difference to WebSocket
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but libcurl itself does not make any verification of the content or
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precautions that you actually send valid UTF\-8 content.
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.IP CURLWS_BINARY
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This is binary data.
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.IP CURLWS_CONT
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This is not the final fragment of the message, which implies that there is
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another fragment coming as part of the same message where this bit is not set.
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.IP CURLWS_CLOSE
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Close this transfer.
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.IP CURLWS_PING
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This is a ping.
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.IP CURLWS_PONG
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This is a pong.
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.IP CURLWS_OFFSET
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The provided data is only a partial fragment and there is more coming in a
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following call to \fIcurl_ws_send()\fP. When sending only a piece of the
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fragment like this, the \fIfragsize\fP must be provided with the total
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expected fragment size in the first call and it needs to be zero in subsequent
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calls.
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.SH PROTOCOLS
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This functionality affects ws only
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.SH EXAMPLE
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.nf
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#include <string.h> /* for strlen */
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const char *send_payload = "magic";
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int main(void)
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{
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size_t sent;
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CURLcode res;
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CURL *curl = curl_easy_init();
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curl_easy_setopt(curl, CURLOPT_URL, "wss://example.com/");
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curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 2L);
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curl_easy_perform(curl);
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res = curl_ws_send(curl, send_payload, strlen(send_payload), &sent, 0,
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CURLWS_PING);
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curl_easy_cleanup(curl);
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return (int)res;
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}
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.fi
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.SH AVAILABILITY
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Added in curl 7.86.0
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.SH RETURN VALUE
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\fICURLE_OK\fP (zero) means that the data was sent properly, non\-zero means an
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error occurred as \fI<curl/curl.h>\fP defines. See the \fIlibcurl\-errors(3)\fP man
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page for the full list with descriptions.
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.SH SEE ALSO
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.BR curl_easy_getinfo (3),
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.BR curl_easy_perform (3),
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.BR curl_easy_setopt (3),
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.BR curl_ws_recv (3),
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.BR libcurl-ws (3)
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