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57 lines
1.7 KiB
Groff
57 lines
1.7 KiB
Groff
.\" generated by cd2nroff 0.1 from curl_ws_recv.md
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.TH curl_ws_recv 3 "March 15 2024" 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_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_send (3),
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.BR libcurl-ws (3)
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