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.\" $OpenBSD: gai_strerror.3,v 1.1 2004/12/06 10:46:35 jmc Exp $
.\"
.\" Copyright (c) 1983, 1987, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd December 3, 2004
.Dt GAI_STRERROR 3
.Os
.\"
.Sh NAME
.Nm gai_strerror
.Nd return EAI_xxx error message
.\"
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/socket.h>
.Fd #include <netdb.h>
.Ft "char *"
.Fn gai_strerror "int ecode"
.\"
.Sh DESCRIPTION
To aid applications in printing error messages based on the
.Dv EAI_xxx
codes returned by
.Xr getaddrinfo 3
and
.Xr getnameinfo 3 ,
.Fn gai_strerror
is defined.
The argument is one of the
.Dv EAI_xxx
values detailed below
and the return value points to a string describing the error.
If the argument is not one of the
.Dv EAI_xxx
values,
the function still returns a pointer to a string whose contents
indicate an unknown error.
.Pp
The error return status from
.Xr getaddrinfo 3
and
.Xr getnameinfo 3
is zero on success and non-zero on errors.
Non-zero error codes are defined in
.Aq Pa netdb.h ,
and are as follows:
.Pp
.Bl -tag -width "EAI_ADDRFAMILYXX" -offset indent -compact
.It Dv EAI_ADDRFAMILY
Address family for
.Fa nodename
not supported.
.It Dv EAI_AGAIN
Temporary failure in name resolution.
.It Dv EAI_BADFLAGS
Invalid value for
.Fa ai_flags .
.It Dv EAI_BADHINTS
Invalid value for hints.
.It Dv EAI_FAIL
Non-recoverable failure in name resolution.
.It Dv EAI_FAMILY
.Fa ai_family
not supported.
.It Dv EAI_MEMORY
Memory allocation failure.
.It Dv EAI_NODATA
No address associated with
.Fa nodename .
.It Dv EAI_NONAME
.Fa nodename
nor
.Fa servname
provided, or not known.
.It Dv EAI_PROTOCOL
Resolved protocol is unknown.
.It Dv EAI_SERVICE
.Fa servname
not supported for
.Fa ai_socktype .
.It Dv EAI_SOCKTYPE
.Fa ai_socktype
not supported.
.It Dv EAI_SYSTEM
System error returned in
.Va errno .
.El
.\"
.Sh SEE ALSO
.Xr getaddrinfo 3 ,
.Xr getnameinfo 3
.Sh HISTORY
The implementation first appeared in WIDE Hydrangea IPv6 protocol stack kit.
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