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85 lines
2.5 KiB
85 lines
2.5 KiB
16 years ago
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.\" $Id$
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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_GETHOSTBYNAME 3 "25 July 1998"
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.SH NAME
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ares_gethostbyname_file \- Lookup a name in the system's hosts file
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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_gethostbyname_file(ares_channel \fIchannel\fP, const char *\fIname\fP,
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.B int \fIfamily\fP, struct hostent **host)
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.fi
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.SH DESCRIPTION
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The
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.B ares_gethostbyname_file
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function performs a host lookup by name against the system's hosts file (or equivalent local hostname database).
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The
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.IR channel
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parameter is required, but no asynchronous queries are performed. Instead, the
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lookup is done via the same mechanism used to perform 'f' lookups
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(see the
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.I lookups
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options field in \fIares_init_options(3)\fP).
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The parameter
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.I name
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gives the hostname as a NUL-terminated C string, and
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.I family
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gives the desired type of address for the resulting host entry.
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.PP
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The return value indicates whether the query succeeded and, if not, how it
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failed. It may have any of the following values:
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.TP 19
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.B ARES_SUCCESS
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The host lookup completed successfully and
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.I host
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now points to the result (and must be freed with \fIares_free_hostent(3)\fP).
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.TP 19
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.B ARES_ENOTFOUND
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The hostname
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.I name
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was not found.
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.TP 19
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.B ARES_EFILE
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There was a file I/O error while performing the lookup.
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.TP 19
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.B ARES_ENOMEM
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Memory was exhausted.
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.PP
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On successful completion of the query, the pointer pointed to by
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.I host
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points to a
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.B struct hostent
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containing the address of the host returned by the lookup. The user must
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free the memory pointed to by
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.IR host
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when finished with it by calling \fIares_free_hostent(3)\fP. If the lookup did
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not complete successfully,
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.I host
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will be
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.BR NULL .
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.SH AVAILABILITY
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Added in c-ares 1.5.4
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.SH SEE ALSO
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.BR ares_gethostbyname (3),
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.BR ares_free_hostent (3),
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.BR ares_init_options (3)
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.SH AUTHOR
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Brad Spencer
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.br
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Copyright 1998 by the Massachusetts Institute of Technology.
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