.\"	$OpenBSD: gai_strerror.3,v 1.7 2009/06/02 16:47:50 jasper Exp $
.\"	$KAME: gai_strerror.3,v 1.1 2005/01/05 03:04:47 itojun Exp $
.\"
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.\" Copyright (C) 2000, 2001  Internet Software Consortium.
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.Dd $Mdocdate: June 2 2009 $
.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_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