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.\" Copyright (c) 1983, 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. 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.
.\"
.\" 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.
.\"
.\" @(#)getsockname.2 8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt GETSOCKNAME 2
.Os BSD 4.2
.Sh NAME
.Nm getsockname
.Nd get socket name
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/socket.h>
.Ft int
.Fn getsockname "int s" "struct sockaddr *name" "int *namelen"
.Sh DESCRIPTION
.Fn Getsockname
returns the current
.Fa name
for the specified socket. The
.Fa namelen
parameter should be initialized to indicate
the amount of space pointed to by
.Fa name .
On return it contains the actual size of the name
returned (in bytes).
.Sh IMPLEMENTATION NOTES
.Pp
In the non-threaded library
.Fn getsockname
is implemented as the
.Va getsockname
syscall.
.Pp
In the threaded library, the
.Va getsockname
syscall is assembled to
.Fn _thread_sys_getsockname
and
.Fn getsockname
is implemented as a function which locks
.Va fd
for read and write, then calls
.Fn _thread_sys_getsockname .
Before returning,
.Fn getsockname
unlocks
.Va fd .
.Sh RETURN VALUES
A 0 is returned if the call succeeds, -1 if it fails.
.Sh ERRORS
The call succeeds unless:
.Bl -tag -width ENOTSOCKAA
.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
Insufficient resources were available in the system
to perform the operation.
.It Bq Er EFAULT
The
.Fa name
parameter points to memory not in a valid part of the
process address space.
.El
.Sh SEE ALSO
.Xr bind 2 ,
.Xr getpeername 2 ,
.Xr socket 2
.Sh BUGS
Names bound to sockets in the UNIX domain are inaccessible;
.Xr getsockname
returns a zero length name.
.Sh HISTORY
The
.Fn getsockname
function call appeared in
.Bx 4.2 .
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