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curl_easy_recv
Section: libcurl Manual (3)
Updated: 29 April 2008
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NAME
curl_easy_recv - receives raw data on an "easy" connection
SYNOPSIS
#include <curl/easy.h>
CURLcode curl_easy_recv( CURL *curl, void *buffer,
size_t buflen, size_t *n);
DESCRIPTION
This function receives raw data from the established connection. You may use
it together with curl_easy_send(3) to implement custom protocols using
libcurl. This functionality can be particularly useful if you use proxies
and/or SSL encryption: libcurl will take care of proxy negotiation and
connection set-up.
buffer is a pointer to your buffer that will get the received
data. buflen is the maximum amount of data you can get in that
buffer. The variable n points to will receive the number of received
bytes.
To establish the connection, set CURLOPT_CONNECT_ONLY option before
calling curl_easy_perform(3). Note that curl_easy_recv(3) does not
work on connections that were created without this option.
You must ensure that the socket has data to read before calling
curl_easy_recv(3), otherwise the call will return CURLE_AGAIN -
the socket is used in non-blocking mode internally. Use
curl_easy_getinfo(3) with CURLINFO_LASTSOCKET to obtain the
socket; use your operating system facilities like select(2) to check if
it has any data you can read.
AVAILABILITY
Added in 7.18.2.
RETURN VALUE
On success, returns CURLE_OK, stores the received data into
buffer, and the number of bytes it actually read into *n.
On failure, returns the appropriate error code.
If there is no data to read, the function returns CURLE_AGAIN. Use
your operating system facilities to wait until the data is ready, and retry.
EXAMPLE
See sendrecv.c in docs/examples directory for usage example.
SEE ALSO
curl_easy_setopt(3), curl_easy_perform(3),
curl_easy_getinfo(3),
curl_easy_send(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- AVAILABILITY
-
- RETURN VALUE
-
- EXAMPLE
-
- SEE ALSO
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