curl_ws_recv(3) Library Functions Manual curl_ws_recv(3)
NAME
curl_ws_recv - receive WebSocket data
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_ws_recv(CURL *curl, void *buffer, size_t buflen,
size_t *recv, const struct curl_ws_frame **meta);
DESCRIPTION
This function call is EXPERIMENTAL.
Retrieves as much as possible of a received WebSocket data fragment
into the buffer, but not more than buflen bytes. recv is set to the
number of bytes actually stored.
If there is more fragment data to deliver than what fits in the
provided buffer, libcurl returns a full buffer and the application
needs to call this function again to continue draining the buffer.
The meta pointer gets set to point to a const struct curl_ws_frame that
contains information about the received data. See the curl_ws_meta(3)
for details on that struct.
PROTOCOLS
This functionality affects ws only
EXAMPLE
int main(void)
{
size_t rlen;
const struct curl_ws_frame *meta;
char buffer[256];
CURL *curl = curl_easy_init();
if(curl) {
CURLcode res = curl_ws_recv(curl, buffer, sizeof(buffer), &rlen, &meta);
if(res)
printf("error: %s\n", curl_easy_strerror(res));
}
}
AVAILABILITY
Added in curl 7.86.0
RETURN VALUE
Returns CURLE_OK if everything is okay, and a non-zero number for
errors. Returns CURLE_GOT_NOTHING if the associated connection is
closed.
Instead of blocking, the function returns CURLE_AGAIN. The correct
behavior is then to wait for the socket to signal readability before
calling this function again.
SEE ALSO
curl_easy_getinfo(3), curl_easy_perform(3), curl_easy_setopt(3),
curl_ws_send(3), libcurl-ws(3)
libcurl 2024-08-05 curl_ws_recv(3)
curl 8.9.1 - Generated Wed Aug 7 14:00:35 CDT 2024