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CentOS 7.0 - man page for ares_process (centos section 3)

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       ares_process - Process events for name resolution

       #include <ares.h>

       void ares_process(ares_channel channel, fd_set *read_fds,
       fd_set *write_fds)

       void ares_process_fd(ares_channel channel, ares_socket_t read_fd, ares_socket_t write_fd)

       The  ares_process(3)  function  handles	input/output  events and timeouts associated with
       queries pending on the name service channel identified by channel.   The  file  descriptor
       sets pointed to by read_fds and write_fds should have file descriptors set in them accord-
       ing to whether the file descriptors specified by ares_fds(3) are  ready	for  reading  and
       writing.   (The easiest way to determine this information is to invoke select with a time-
       out no greater than the timeout given by ares_timeout(3) ).

       The ares_process function will invoke callbacks for pending queries if they complete  suc-
       cessfully or fail.

       ares_process_fd(3)  works  the  same  way  but acts and operates only on the specific file
       descriptors (sockets) you pass in to the function. Use ARES_SOCKET_BAD  for  "no  action".
       This  function  is  of  course provided to allow users of c-ares to void select() in their
       applications and within c-ares.

       The following code fragment waits for all pending queries on a channel to complete:

	      int nfds, count;
	      fd_set readers, writers;
	      struct timeval tv, *tvp;

	      while (1)
		  nfds = ares_fds(channel, &readers, &writers);
		  if (nfds == 0)
		  tvp = ares_timeout(channel, NULL, &tv);
		  count = select(nfds, &readers, &writers, NULL, tvp);
		  ares_process(channel, &readers, &writers);

       ares_fds(3), ares_timeout(3)

       Greg Hudson, MIT Information Systems
       Copyright 1998 by the Massachusetts Institute of Technology.

					   25 July 1998 			  ARES_PROCESS(3)
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