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9bccf70c A	1	.\" $NetBSD: getsockname.2,v 1.6 1995/10/12 15:41:00 jtc Exp $
	2	.\"
	3	.\" Copyright (c) 1983, 1991, 1993
	4	.\" The Regents of the University of California. All rights reserved.
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	9	.\" 1. Redistributions of source code must retain the above copyright
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	15	.\" must display the following acknowledgement:
	16	.\" This product includes software developed by the University of
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	20	.\" without specific prior written permission.
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	22	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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	33	.\"
	34	.\" @(#)getsockname.2 8.1 (Berkeley) 6/4/93
	35	.\"
	36	.Dd June 4, 1993
	37	.Dt GETSOCKNAME 2
	38	.Os BSD 4.2
	39	.Sh NAME
	40	.Nm getsockname
	41	.Nd get socket name
	42	.Sh SYNOPSIS
	43	.Fd #include <sys/socket.h>
	44	.Ft int
2d21ac55 A	45	.Fo getsockname
	46	.Fa "int socket"
	47	.Fa "struct sockaddr *restrict address"
	48	.Fa "socklen_t *restrict address_len"
	49	.Fc
9bccf70c	50	.Sh DESCRIPTION
b0d623f7 A	51	The
b0d623f7 A	52	.Fn getsockname
3e170ce0	53	function returns the current
2d21ac55	54	.Fa address
b0d623f7 A	55	for the specified socket.
	56	.Pp
	57	The
2d21ac55	58	.Fa address_len
9bccf70c A	59	parameter should be initialized to indicate
9bccf70c A	60	the amount of space pointed to by
2d21ac55	61	.Fa address .
b0d623f7	62	On return it contains the actual size of the address
9bccf70c	63	returned (in bytes).
b0d623f7 A	64	.Pp
b0d623f7 A	65	The address is truncated if the buffer provided is too small.
d9a64523 A	66	.Pp
	67	Note: For the UNIX domain, the address length returned is the
	68	.Fa address_len
	69	parameter passed to the previous
	70	.Xr bind 2
	71	system call and not the
	72	.Va sa_len
	73	field of the
	74	.Fa address
	75	parameter passed to
	76	.Xr bind 2 .
2d21ac55 A	77	.Sh RETURN VALUES
2d21ac55 A	78	.Rv -std getsockname
9bccf70c	79	.Sh ERRORS
2d21ac55 A	80	The
	81	.Fn getsockname
	82	system call will succeed unless:
9bccf70c	83	.Bl -tag -width Er
2d21ac55	84	.\" ==========
9bccf70c A	85	.It Bq Er EBADF
9bccf70c A	86	The argument
2d21ac55 A	87	.Fa socket
	88	is not a valid file descriptor.
	89	.\" ==========
9bccf70c A	90	.It Bq Er EFAULT
9bccf70c A	91	The
2d21ac55	92	.Fa address
9bccf70c A	93	parameter points to memory not in a valid part of the
9bccf70c A	94	process address space.
2d21ac55 A	95	.\" ==========
	96	.It Bq Er EINVAL
	97	.Fa socket
	98	has been shut down.
	99	.\" ==========
	100	.It Bq Er ENOBUFS
	101	Insufficient resources were available in the system
	102	to perform the operation.
	103	.\" ==========
	104	.It Bq Er ENOTSOCK
	105	The argument
	106	.Fa socket
	107	is not a socket (e.g., a plain file).
	108	.\" ==========
	109	.It Bq Er EOPNOTSUPP
	110	.Fn getsockname
	111	is not supported for the protocol in use by
	112	.Fa socket .
9bccf70c A	113	.El
	114	.Sh SEE ALSO
	115	.Xr bind 2 ,
	116	.Xr socket 2
	117	.Sh BUGS
	118	Names bound to sockets in the UNIX domain are inaccessible;
2d21ac55	119	.Fn getsockname
b0d623f7	120	returns a zero-length address.
9bccf70c A	121	.Sh HISTORY
	122	The
	123	.Fn getsockname
2d21ac55	124	call appeared in
9bccf70c	125	.Bx 4.2 .