not always zero!

used anymore since multi->num_alive was introduced

Silence compiler warning 'unused parameter running_handles' in function multi_runsingle(). This is done here returning multi->num_alive in the running_handles parameter even when functions that call multi_runsingle() at this moment overwrite the returned value with the one that is valid when those functions curl_multi_perform() and multi_socket() have removed expired timers from the splay. Most probably, parameter 'running_handles' in function multi_runsingle() should be just removed.

*multi_socket*() can't return the proper number

if the header "Transfer-Encoding: chunked" was set by the application.
http://curl.haxx.se/bug/view.cgi?id=1531838

an unknown error number on glibc systems.
http://curl.haxx.se/bug/view.cgi?id=1532289

both now provide the number of running handles back to the calling function.

Winsock and Cygwin need address family specification before bind(), this should be harmless for others.

Reintroduce checking for HAVE_MSG_NOSIGNAL in configure script, so that we don't depend on header inclusion order for a valid check.

formposts work exactly the way you want it (and the way you'd assume it
works)

behaviour and a socket leak

control and data connection, as the existing --ftp-ssl option only requests
it.

set a private pointer added to the internal libcurl hash table for the
particular socket passed in to this function.

tool option named --ftp-alternative-to-user. It provides a mean to send a
particular command if the normal USER/PASS approach fails.

newer MSVC versions)

Simplify check for NEED_MALLOC_H, and make more explicit that NEED_MALLOC_H shall be defined if <malloc.h> header file must be included even when including <stdlib.h>.

Curl_freeaddrinfo() and Curl_ip2addr().