1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162 |
- .\" $Id$
- .\"
- .\" 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.
|