| .\" |
| .\" Copyright 1998 by the Massachusetts Institute of Technology. |
| .\" |
| .\" Permission to use, copy, modify, and distribute this |
| .\" software and its documentation for any purpose and without |
| .\" fee is hereby granted, provided that the above copyright |
| .\" notice appear in all copies and that both that copyright |
| .\" notice and this permission notice appear in supporting |
| .\" documentation, and that the name of M.I.T. not be used in |
| .\" advertising or publicity pertaining to distribution of the |
| .\" software without specific, written prior permission. |
| .\" M.I.T. makes no representations about the suitability of |
| .\" this software for any purpose. It is provided "as is" |
| .\" without express or implied warranty. |
| .\" |
| .TH ARES_FDS 3 "23 July 1998" |
| .SH NAME |
| ares_fds \- Get file descriptors to select on for name service |
| .SH SYNOPSIS |
| .nf |
| .B #include <ares.h> |
| .PP |
| .B int ares_fds(ares_channel \fIchannel\fP, fd_set *\fIread_fds\fP, |
| .B fd_set *\fIwrite_fds\fP) |
| .fi |
| .SH DESCRIPTION |
| The |
| .B 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 |
| .IR channel . |
| File descriptors will be set in the file descriptor sets pointed to by |
| .I read_fds |
| and |
| .I write_fds |
| as appropriate. File descriptors already set in |
| .I read_fds |
| and |
| .I write_fds |
| will remain set; initialization of the file descriptor sets |
| (using |
| .BR FD_ZERO ) |
| is the responsibility of the caller. |
| .SH RETURN VALUES |
| .B ares_fds |
| returns one greater than the number of the highest socket set in either |
| .I read_fds |
| or |
| .IR write_fds . |
| If no queries are active, |
| .B ares_fds |
| will return 0. |
| .SH SEE ALSO |
| .BR ares_timeout (3), |
| .BR ares_process (3) |
| .SH AUTHOR |
| Greg Hudson, MIT Information Systems |
| .br |
| Copyright 1998 by the Massachusetts Institute of Technology. |