curl_easy_recv.3: document return codes

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.\" * Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.

.\" * Copyright (C) 1998 - 2013, Daniel Stenberg, <daniel@haxx.se>, et al.

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.\" * This software is licensed as described in the file COPYING, which

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On failure, returns the appropriate error code.

If there is no data to read, the function returns \fBCURLE_AGAIN\fP. Use

your operating system facilities to wait until the data is ready, and retry.

If there is no data to read, the function returns \fBCURLE_AGAIN\fP. Use your

operating system facilities to wait until the data is ready, and retry.

Reading exactly 0 bytes would indicate a closed connection.

If there's no socket available to use from the previous transfer, this function

returns CURLE_UNSUPPORTED_PROTOCOL.

.SH EXAMPLE

See \fBsendrecv.c\fP in \fBdocs/examples\fP directory for usage example.

.SH "SEE ALSO"