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| ARES_PROCESS(3) | FreeBSD Library Functions Manual | ARES_PROCESS(3) |
NAME
ares_process - Process events for name resolutionSYNOPSIS
#include <ares.h>
void ares_process(ares_channel channel, fd_set *read_fds, fd_set *write_fds)
DESCRIPTION
The ares_process 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 according 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 timeout no greater than the timeout given by ares_timeout(3)).The ares_process function will invoke callbacks for pending queries if they complete successfully or fail.
EXAMPLE
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)
{
FD_ZERO(&readers);
FD_ZERO(&writers);
nfds = ares_fds(channel, &readers, &writers);
if (nfds == 0)
break;
tvp = ares_timeout(channel, NULL, &tv);
count = select(nfds, &readers, &writers, NULL, tvp);
ares_process(channel, &readers, &writers);
}
SEE ALSO
ares_fds(3), ares_timeout(3)AUTHOR
Greg Hudson, MIT Information SystemsCopyright 1998 by the Massachusetts Institute of Technology.
| 25 July 1998 |
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