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.\" $OpenBSD: gai_strerror.3,v 1.8 2013/06/05 03:39:22 tedu 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.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" 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
.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
.\" PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: June 5 2013 $
.Dt GAI_STRERROR 3
.Os
.Sh NAME
.Nm gai_strerror
.Nd get error message string from EAI_xxx error code
.Sh SYNOPSIS
.In sys/types.h
.In sys/socket.h
.In 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_OVERFLOW
argument buffer overflow
.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
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