.\"	$OpenBSD: gai_strerror.3,v 1.5 2005/01/06 03:50:46 itojun Exp $
.\"	$KAME: gai_strerror.3,v 1.1 2005/01/05 03:04:47 itojun Exp $
.\"
.\" Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
.\" Copyright (C) 2000, 2001  Internet Software Consortium.
.\"
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.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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.\"
.Dd December 20, 2004
.Dt GAI_STRERROR 3
.Os
.Sh NAME
.Nm gai_strerror
.Nd get error message string from EAI_xxx error code
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/socket.h>
.Fd #include <netdb.h>
.Ft "const char *"
.Fn gai_strerror "int ecode"
.Sh DESCRIPTION
The
.Fn gai_strerror
function returns an error message string corresponding to the error code
returned by
.Xr getaddrinfo 3
or
.Xr getnameinfo 3 .
.Pp
The following error codes and their meaning are defined in
.Aq Pa netdb.h :
.Pp
.Bl -tag -width "EAI_ADDRFAMILYXX" -offset indent -compact
.It Dv EAI_ADDRFAMILY
address family for
.Fa hostname
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
.Fa 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 hostname
.It Dv EAI_NONAME
.Fa hostname
or
.Fa servname
not 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 RETURN VALUES
.Fn gai_strerror
returns a pointer to the error message string corresponding to
.Fa ecode .
If
.Fa ecode
is out of range, an implementation-specific error message string is returned.
.Sh SEE ALSO
.Xr getaddrinfo 3 ,
.Xr getnameinfo 3