ares_fds.txt

来自「RTL-lwIP is the porting of the lwIP TCP/」· 文本 代码 · 共 39 行

ARES_FDS(3)                                                        ARES_FDS(3)



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.



                                 23 July 1998                      ARES_FDS(3)