80 lines
2.8 KiB
Groff
80 lines
2.8 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH curl_ws_recv 3 "12 Jun 2022" "libcurl" "libcurl"
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.SH NAME
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curl_ws_recv - receive 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_recv(CURL *curl, void *buffer, size_t buflen,
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size_t *recv, const struct curl_ws_frame **meta);
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.fi
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.SH DESCRIPTION
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This function call is EXPERIMENTAL.
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Retrieves as much as possible of a received WebSocket data fragment into the
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\fBbuffer\fP, but not more than \fBbuflen\fP bytes. \fIrecv\fP is set to the
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number of bytes actually stored.
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If there is more fragment data to deliver than what fits in the provided
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\fIbuffer\fP, libcurl returns a full buffer and the application needs to call
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this function again to continue draining the buffer.
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The \fImeta\fP pointer gets set to point to a \fIconst struct curl_ws_frame\fP
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that contains information about the received data. See the
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\fIcurl_ws_meta(3)\fP for details on that struct.
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.SH EXAMPLE
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.nf
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int main(void)
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{
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size_t rlen;
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const struct curl_ws_frame *meta;
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char buffer[256];
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
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if(res)
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printf("error: %s\\n", curl_easy_strerror(res));
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.86.0.
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.SH RETURN VALUE
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Returns \fBCURLE_OK\fP if everything is okay, and a non-zero number for
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errors. Returns \fBCURLE_GOT_NOTHING\fP if the associated connection is
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closed.
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Instead of blocking, the function returns \fBCURLE_AGAIN\fP. The correct
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behavior is then to wait for the socket to signal readability before calling
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this function again.
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.SH "SEE ALSO"
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.BR curl_easy_setopt (3),
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.BR curl_easy_perform (3),
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.BR curl_easy_getinfo (3),
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.BR curl_ws_send (3),
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.BR libcurl-ws (3)
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