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Diffstat (limited to 'src/c-ares/ares_getnameinfo.3')
| -rw-r--r-- | src/c-ares/ares_getnameinfo.3 | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/src/c-ares/ares_getnameinfo.3 b/src/c-ares/ares_getnameinfo.3 new file mode 100644 index 00000000..10174321 --- /dev/null +++ b/src/c-ares/ares_getnameinfo.3 @@ -0,0 +1,151 @@ +.\" +.\" Copyright 2005 by Dominick Meglio. +.\" +.\" Permission to use, copy, modify, and distribute this +.\" software and its documentation for any purpose and without +.\" fee is hereby granted, provided that the above copyright +.\" notice appear in all copies and that both that copyright +.\" notice and this permission notice appear in supporting +.\" documentation, and that the name of M.I.T. not be used in +.\" advertising or publicity pertaining to distribution of the +.\" software without specific, written prior permission. +.\" M.I.T. makes no representations about the suitability of +.\" this software for any purpose. It is provided "as is" +.\" without express or implied warranty. +.\" +.TH ARES_GETNAMEINFO 3 "1 May 2009" +.SH NAME +ares_getnameinfo \- Address-to-nodename translation in protocol-independent manner +.SH SYNOPSIS +.nf +.B #include <ares.h> +.PP +.B typedef void (*ares_nameinfo_callback)(void *\fIarg\fP, int \fIstatus\fP, +.B int \fItimeouts\fP, char *\fInode\fP, char *\fIservice\fP) +.PP +.B void ares_getnameinfo(ares_channel \fIchannel\fP, const struct sockaddr *\fIsa\fP, +.B ares_socklen_t \fIsalen\fP, int \fIflags\fP, ares_nameinfo_callback \fIcallback\fP, +.B void *\fIarg\fP) +.fi +.SH DESCRIPTION +The +.B ares_getnameinfo +function is defined for protocol-independent address translation. The function +is a combination of \fIares_gethostbyaddr(3)\fP and \fIgetservbyport(3)\fP. The function will +translate the address either by executing a host query on the name service channel +identified by +.IR channel +or it will attempt to resolve it locally if possible. +The parameters +.I sa +and +.I len +give the address as a sockaddr structure, and +.I flags +gives the options that the function will use. Valid flags are listed below: +.TP 19 +.B ARES_NI_NOFQDN +Only the nodename portion of the FQDN is returned for local hosts. +.TP 19 +.B ARES_NI_NUMERICHOST +The numeric form of the hostname is returned rather than the name. +.TP 19 +.B ARES_NI_NAMEREQD +An error is returned if the hostname cannot be found in the DNS. +.TP 19 +.B ARES_NI_NUMERICSERV +The numeric form of the service is returned rather than the name. +.TP 19 +.B ARES_NI_TCP +The service name is to be looked up for the TCP protocol. +.TP 19 +.B ARES_NI_UDP +The service name is to be looked up for the UDP protocol. +.TP 19 +.B ARES_NI_SCTP +The service name is to be looked up for the SCTP protocol. +.TP 19 +.B ARES_NI_DCCP +The service name is to be looked up for the DCCP protocol. +.TP 19 +.B ARES_NI_NUMERICSCOPE +The numeric form of the scope ID is returned rather than the name. +.TP 19 +.B ARES_NI_LOOKUPHOST +A hostname lookup is being requested. +.TP 19 +.B ARES_NI_LOOKUPSERVICE +A service name lookup is being requested. +.PP +When the query +is complete or has +failed, the ares library will invoke \fIcallback\fP. Completion or failure of +the query may happen immediately, or may happen during a later call to +\fIares_process(3)\fP, \fIares_destroy(3)\fP or \fIares_cancel(3)\fP. +.PP +The callback argument +.I arg +is copied from the +.B ares_getnameinfo +argument +.IR arg . +The callback argument +.I status +indicates whether the query succeeded and, if not, how it failed. It +may have any of the following values: +.TP 19 +.B ARES_SUCCESS +The host lookup completed successfully. +.TP 19 +.B ARES_ENOTIMP +The ares library does not know how to look up addresses of type +.IR family . +.TP 19 +.B ARES_ENOTFOUND +The address +.I addr +was not found. +.TP 19 +.B ARES_ENOMEM +Memory was exhausted. +.TP 19 +.B ARES_ECANCELLED +The query was cancelled. +.TP 19 +.B ARES_EDESTRUCTION +The name service channel +.I channel +is being destroyed; the query will not be completed. +.TP 19 +.B ARES_EBADFLAGS +The +.I flags +parameter contains an illegal value. +.PP +The callback argument +.I timeouts +reports how many times a query timed out during the execution of the +given request. +.PP +On successful completion of the query, the callback argument +.I node +contains a string representing the hostname (assuming +.B ARES_NI_LOOKUPHOST +was specified). Additionally, +.I service +contains a string representing the service name (assuming +.B ARES_NI_LOOKUPSERVICE +was specified). +If the query did not complete successfully, or one of the values +was not requested, +.I node +or +.I service +will be +.BR NULL . +.SH SEE ALSO +.BR ares_process (3), +.SH AUTHOR +Dominick Meglio +.br +Copyright 2005 by Dominick Meglio. |