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61 lines
1.8 KiB
61 lines
1.8 KiB
.\" |
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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_FDS 3 "23 July 1998" |
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.SH NAME |
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ares_fds \- Get file descriptors to select on for name service |
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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_fds(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_fds |
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function retrieves the set of file descriptors which the calling |
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application should select on for reading and 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 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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as appropriate. File descriptors already set in |
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.I read_fds |
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and |
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.I write_fds |
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will remain set; initialization of the file descriptor sets |
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(using |
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.BR FD_ZERO ) |
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is the responsibility of the caller. |
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.SH RETURN VALUES |
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.B ares_fds |
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returns one greater than the number of the highest socket set in either |
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.I read_fds |
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or |
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.IR write_fds . |
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If no queries are active, |
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.B ares_fds |
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will return 0. |
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.SH SEE ALSO |
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.BR ares_timeout (3), |
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.BR ares_process (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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