NetBSD/lib/libc/sys/getsockname.2

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.\" $NetBSD: getsockname.2,v 1.16 2002/02/08 01:28:18 ross Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" 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
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.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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.
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.\" @(#)getsockname.2 8.1 (Berkeley) 6/4/93
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.\"
.Dd October 22, 2001
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.Dt GETSOCKNAME 2
.Os
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.Sh NAME
.Nm getsockname
.Nd get socket name
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Fd #include \*[Lt]sys/socket.h\*[Gt]
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.Ft int
.Fn getsockname "int s" "struct sockaddr * restrict name" "socklen_t * restrict namelen"
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.Sh DESCRIPTION
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The
.Fn getsockname
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system call returns the current
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.Fa name
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for the specified socket.
The
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.Fa namelen
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parameter should be initialized to indicate the amount of space
pointed to by
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.Fa name .
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On return it contains the actual size of the name returned (in
bytes).
.Sh RETURN VALUES
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A 0 is returned if the call succeeds, -1 if it fails.
.Sh ERRORS
The call succeeds unless:
.Bl -tag -width Er
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.It Bq Er EBADF
The argument
.Fa s
is not a valid descriptor.
.It Bq Er ENOTSOCK
The argument
.Fa s
is a file, not a socket.
.It Bq Er ENOBUFS
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Insufficient resources were available in the system to perform the operation.
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.It Bq Er EFAULT
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The
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.Fa name
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parameter points to memory not in a valid part of the process address space.
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.El
.Sh SEE ALSO
.Xr bind 2 ,
.Xr socket 2
.Sh HISTORY
The
.Fn getsockname
function call appeared in
.Bx 4.2 .
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.Sh BUGS
Names bound to sockets in the
.Ux
domain are inaccessible;
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.Fn getsockname
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returns a zero length name.