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#1160 libcurl hangs when sftp destination run out of space
when sftp destination is roun out of space, libcurl hangs, and try send more data forever. The error is in lib/ssh.c at Curl_scp_send and Curl_sftp_send function:
The libssh2_sftp_write returns number of bytes written or negative on failure. (http://www.libssh2.org/libssh2_sftp_write.html), the libssh2_channel_write function do the same.
The original bug report was found here: https://bugs.launchpad.net/ubuntu/+source/curl/+bug/1056141 and it contains a patch.
The original bug report seems to be for curl 7.19 but a quick look at current (7.28.0) code indicates that the problem remains today.
Discussion
The ubuntu bug report is incorrect. The code treats a negative return value as an error and will cause the libcurl functions to return CURLE_SEND_ERROR internally. I can't detect how the suggested patch would make anything differently.