NAME¶
ares_fds - Get file descriptors to select on for name service
SYNOPSIS¶
#include <ares.h>
int ares_fds(ares_channel channel, fd_set *read_fds,
fd_set *write_fds)
DESCRIPTION¶
The
ares_fds function retrieves the set of file descriptors which the
calling application should select on for reading and writing for the
processing of name service queries pending on the name service channel
identified by
channel. File descriptors will be set in the file
descriptor sets pointed to by
read_fds and
write_fds as
appropriate. File descriptors already set in
read_fds and
write_fds will remain set; initialization of the file descriptor sets
(using
FD_ZERO) is the responsibility of the caller.
RETURN VALUES¶
ares_fds returns one greater than the number of the highest socket set in
either
read_fds or
write_fds. If no queries are active,
ares_fds will return 0.
SEE ALSO¶
ares_timeout(3),
ares_process(3)
AUTHOR¶
Greg Hudson, MIT Information Systems
Copyright 1998 by the Massachusetts Institute of Technology.