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79 lines
2.2 KiB
79 lines
2.2 KiB
.\" $Id$ |
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.\" |
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.\" Copyright 1998 by the Massachusetts Institute of Technology. |
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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_PROCESS 3 "25 July 1998" |
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.SH NAME |
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ares_process \- Process events for name resolution |
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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 void ares_process(ares_channel \fIchannel\fP, fd_set *\fIread_fds\fP, |
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.B fd_set *\fIwrite_fds\fP) |
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.fi |
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.SH DESCRIPTION |
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The |
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.B ares_process |
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function handles input/output events and timeouts associated with |
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queries pending on the name service channel identified by |
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.IR channel . |
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The file descriptor sets pointed to by |
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.I read_fds |
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and |
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.I write_fds |
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should have file descriptors set in them according to whether the file |
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descriptors specified by |
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.BR ares_fds (3) |
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are ready for reading and writing. (The easiest way to determine this |
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information is to invoke |
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.B select |
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with a timeout no greater than the timeout given by |
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.BR ares_timeout (3)). |
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.PP |
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The |
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.B ares_process |
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function will invoke callbacks for pending queries if they complete |
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successfully or fail. |
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.SS EXAMPLE |
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The following code fragment waits for all pending queries on a channel |
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to complete: |
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.PP |
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.RS |
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.nf |
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int nfds, count; |
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fd_set readers, writers; |
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struct timeval tv, *tvp; |
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while (1) |
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{ |
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FD_ZERO(&readers); |
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FD_ZERO(&writers); |
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nfds = ares_fds(channel, &readers, &writers); |
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if (nfds == 0) |
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break; |
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tvp = ares_timeout(channel, NULL, &tv); |
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count = select(nfds, &readers, &writers, NULL, tvp); |
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ares_process(channel, &readers, &writers); |
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} |
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.fi |
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.RE |
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.SH SEE ALSO |
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.BR ares_fds (3), |
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.BR ares_timeout (3) |
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.SH AUTHOR |
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Greg Hudson, MIT Information Systems |
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.br |
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Copyright 1998 by the Massachusetts Institute of Technology.
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