2005-12-22 23:27:41 +08:00
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.\" $Id$
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.\"
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.\" Copyright 1998 by Daniel Stenberg
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.\"
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.\" Permission to use, copy, modify, and distribute this
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.\" software and its documentation for any purpose and without
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.\" fee is hereby granted, provided that the above copyright
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.\" notice appear in all copies and that both that copyright
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.\" notice and this permission notice appear in supporting
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.\" documentation, and that the name of M.I.T. not be used in
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.\" advertising or publicity pertaining to distribution of the
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.\" software without specific, written prior permission.
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.\" M.I.T. makes no representations about the suitability of
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.\" this software for any purpose. It is provided "as is"
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.\" without express or implied warranty.
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.\"
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.TH ARES_GETSOCK 3 "22 December 2005"
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.SH NAME
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ares_getsock \- get file descriptors to wait on
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.SH SYNOPSIS
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.nf
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.B #include <ares.h>
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.PP
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.B int ares_getsock(ares_channel \fIchannel\fP, int *\fIsocks\fP,
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.B int \fInumsocks\fP);
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.fi
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.SH DESCRIPTION
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The
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.B ares_getsock
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function retrieves the set of file descriptors which the calling
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application should wait on for reading and/or writing for the
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processing of name service queries pending on the name service channel
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identified by
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.IR channel .
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File descriptors will be set in the integer array pointed to by
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\fIsocks\fP.
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\fInumsocks\fP is the size of the given array in number of ints.
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This function can only return information about up to 16 sockets. If more are
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in use (however unlikely that is), they are simply not reported back.
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.SH RETURN VALUES
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\fBares_getsock\fP returns a bitmask for what actions to wait for on the
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different sockets. The ares.h header file provides these convenience macros to
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extract the information appropriately:
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.nf
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#define ARES_GETSOCK_MAXNUM 16 /* ares_getsock() can return info about
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this many sockets */
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#define ARES_GETSOCK_READABLE(bits,num) (bits & (1<< (num)))
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#define ARES_GETSOCK_WRITABLE(bits,num) (bits & (1 << ((num) + \
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ARES_GETSOCK_MAXNUM)))
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.fi
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2005-12-22 23:31:32 +08:00
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.SH NOTES
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This function was added in c-ares 1.3.1
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2005-12-22 23:27:41 +08:00
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.SH SEE ALSO
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.BR ares_timeout (3),
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.BR ares_fds (3),
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.BR ares_process (3)
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