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59 lines
2.2 KiB
59 lines
2.2 KiB
.\" |
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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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.\" SPDX-License-Identifier: MIT |
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.\" |
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.TH ARES_GETSOCK 3 "11 March 2010" |
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.SH NAME |
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ares_getsock \- get socket descriptors to wait on |
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.SH SYNOPSIS |
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.nf |
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#include <ares.h> |
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int ares_getsock(ares_channel_t *\fIchannel\fP, ares_socket_t *\fIsocks\fP, |
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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 socket 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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Socket descriptors will be set in the socket descriptor 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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.SH NOTES |
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This function was added in c-ares 1.3.1 |
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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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