xref: /onnv-gate/usr/src/lib/libsocket/socket/socketpair.c (revision 0:68f95e015346)
1*0Sstevel@tonic-gate /*
2*0Sstevel@tonic-gate  * CDDL HEADER START
3*0Sstevel@tonic-gate  *
4*0Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*0Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*0Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*0Sstevel@tonic-gate  * with the License.
8*0Sstevel@tonic-gate  *
9*0Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*0Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*0Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*0Sstevel@tonic-gate  * and limitations under the License.
13*0Sstevel@tonic-gate  *
14*0Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*0Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*0Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*0Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*0Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*0Sstevel@tonic-gate  *
20*0Sstevel@tonic-gate  * CDDL HEADER END
21*0Sstevel@tonic-gate  */
22*0Sstevel@tonic-gate /*
23*0Sstevel@tonic-gate  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
24*0Sstevel@tonic-gate  * Use is subject to license terms.
25*0Sstevel@tonic-gate  */
26*0Sstevel@tonic-gate 
27*0Sstevel@tonic-gate /*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
28*0Sstevel@tonic-gate /*	  All Rights Reserved   */
29*0Sstevel@tonic-gate 
30*0Sstevel@tonic-gate /*
31*0Sstevel@tonic-gate  * University Copyright- Copyright (c) 1982, 1986, 1988
32*0Sstevel@tonic-gate  * The Regents of the University of California
33*0Sstevel@tonic-gate  * All Rights Reserved
34*0Sstevel@tonic-gate  *
35*0Sstevel@tonic-gate  * University Acknowledgment- Portions of this document are derived from
36*0Sstevel@tonic-gate  * software developed by the University of California, Berkeley, and its
37*0Sstevel@tonic-gate  * contributors.
38*0Sstevel@tonic-gate  */
39*0Sstevel@tonic-gate 
40*0Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
41*0Sstevel@tonic-gate 
42*0Sstevel@tonic-gate #include <sys/types.h>
43*0Sstevel@tonic-gate #include <sys/socket.h>
44*0Sstevel@tonic-gate #include <sys/stropts.h>
45*0Sstevel@tonic-gate #include <sys/stream.h>
46*0Sstevel@tonic-gate #include <sys/socketvar.h>
47*0Sstevel@tonic-gate #include <errno.h>
48*0Sstevel@tonic-gate #include <unistd.h>
49*0Sstevel@tonic-gate #include <stdlib.h>
50*0Sstevel@tonic-gate 
51*0Sstevel@tonic-gate extern int _socket_create(int, int, int, int);
52*0Sstevel@tonic-gate extern int _so_socketpair(int*);
53*0Sstevel@tonic-gate 
54*0Sstevel@tonic-gate int _socketpair_create(int, int, int, int*, int);
55*0Sstevel@tonic-gate 
56*0Sstevel@tonic-gate #pragma weak socketpair = _socketpair
57*0Sstevel@tonic-gate 
58*0Sstevel@tonic-gate int
_socketpair(int family,int type,int protocol,int sv[2])59*0Sstevel@tonic-gate _socketpair(int family, int type, int protocol, int sv[2])
60*0Sstevel@tonic-gate {
61*0Sstevel@tonic-gate 	return (_socketpair_create(family, type, protocol, sv, SOV_DEFAULT));
62*0Sstevel@tonic-gate }
63*0Sstevel@tonic-gate 
64*0Sstevel@tonic-gate /*
65*0Sstevel@tonic-gate  * Used by the BCP library.
66*0Sstevel@tonic-gate  */
67*0Sstevel@tonic-gate int
_socketpair_bsd(int family,int type,int protocol,int sv[2])68*0Sstevel@tonic-gate _socketpair_bsd(int family, int type, int protocol, int sv[2])
69*0Sstevel@tonic-gate {
70*0Sstevel@tonic-gate 	return (_socketpair_create(family, type, protocol, sv, SOV_SOCKBSD));
71*0Sstevel@tonic-gate }
72*0Sstevel@tonic-gate 
73*0Sstevel@tonic-gate int
_socketpair_svr4(int family,int type,int protocol,int sv[2])74*0Sstevel@tonic-gate _socketpair_svr4(int family, int type, int protocol, int sv[2])
75*0Sstevel@tonic-gate {
76*0Sstevel@tonic-gate 	return (_socketpair_create(family, type, protocol, sv,
77*0Sstevel@tonic-gate 				SOV_SOCKSTREAM));
78*0Sstevel@tonic-gate }
79*0Sstevel@tonic-gate 
80*0Sstevel@tonic-gate int
__xnet_socketpair(int family,int type,int protocol,int sv[2])81*0Sstevel@tonic-gate __xnet_socketpair(int family, int type, int protocol, int sv[2])
82*0Sstevel@tonic-gate {
83*0Sstevel@tonic-gate 	return (_socketpair_create(family, type, protocol, sv,
84*0Sstevel@tonic-gate 				SOV_XPG4_2));
85*0Sstevel@tonic-gate }
86*0Sstevel@tonic-gate 
87*0Sstevel@tonic-gate int
_socketpair_create(int family,int type,int protocol,int sv[2],int version)88*0Sstevel@tonic-gate _socketpair_create(int family, int type, int protocol, int sv[2], int version)
89*0Sstevel@tonic-gate {
90*0Sstevel@tonic-gate 	int res;
91*0Sstevel@tonic-gate 	int fd1, fd2;
92*0Sstevel@tonic-gate 
93*0Sstevel@tonic-gate 	/*
94*0Sstevel@tonic-gate 	 * Create the two sockets and pass them to _so_socketpair, which
95*0Sstevel@tonic-gate 	 * will connect them together.
96*0Sstevel@tonic-gate 	 */
97*0Sstevel@tonic-gate 	fd1 = _socket_create(family, type, protocol, version);
98*0Sstevel@tonic-gate 	if (fd1 < 0)
99*0Sstevel@tonic-gate 		return (-1);
100*0Sstevel@tonic-gate 	fd2 = _socket_create(family, type, protocol, version);
101*0Sstevel@tonic-gate 	if (fd2 < 0) {
102*0Sstevel@tonic-gate 		int error = errno;
103*0Sstevel@tonic-gate 
104*0Sstevel@tonic-gate 		(void) close(fd1);
105*0Sstevel@tonic-gate 		errno = error;
106*0Sstevel@tonic-gate 		return (-1);
107*0Sstevel@tonic-gate 	}
108*0Sstevel@tonic-gate 	sv[0] = fd1;
109*0Sstevel@tonic-gate 	sv[1] = fd2;
110*0Sstevel@tonic-gate 	res = _so_socketpair(sv);
111*0Sstevel@tonic-gate 	if (res < 0) {
112*0Sstevel@tonic-gate 		int error = errno;
113*0Sstevel@tonic-gate 
114*0Sstevel@tonic-gate 		(void) close(fd1);
115*0Sstevel@tonic-gate 		(void) close(fd2);
116*0Sstevel@tonic-gate 		errno = error;
117*0Sstevel@tonic-gate 		return (-1);
118*0Sstevel@tonic-gate 	}
119*0Sstevel@tonic-gate 	/*
120*0Sstevel@tonic-gate 	 * Check if kernel returned different fds in which case we close
121*0Sstevel@tonic-gate 	 * the original ones. This is the case for SOCK_STREAM where
122*0Sstevel@tonic-gate 	 * one of the original sockets is used as a listener and
123*0Sstevel@tonic-gate 	 * _so_socketpair passes out the newly accepted socket.
124*0Sstevel@tonic-gate 	 */
125*0Sstevel@tonic-gate 	if (sv[0] != fd1)
126*0Sstevel@tonic-gate 		(void) close(fd1);
127*0Sstevel@tonic-gate 	if (sv[1] != fd2)
128*0Sstevel@tonic-gate 		(void) close(fd2);
129*0Sstevel@tonic-gate 	return (res);
130*0Sstevel@tonic-gate }
131