xref: /netbsd-src/sys/compat/linux/arch/alpha/linux_pipe.c (revision d46f49d32aa12152b16ad026eeb9a0de7b3b4240)
1 /*	$NetBSD: linux_pipe.c,v 1.18 2017/12/26 08:30:57 kamil Exp $	*/
2 
3 /*-
4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Eric Haszlakiewicz.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: linux_pipe.c,v 1.18 2017/12/26 08:30:57 kamil Exp $");
34 
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/mbuf.h>
39 #include <sys/mman.h>
40 #include <sys/mount.h>
41 #include <sys/proc.h>
42 #include <sys/filedesc.h>
43 #include <sys/fcntl.h>
44 
45 #include <sys/syscallargs.h>
46 
47 #include <compat/linux/common/linux_types.h>
48 #include <compat/linux/common/linux_mmap.h>
49 #include <compat/linux/common/linux_signal.h>
50 #include <compat/linux/common/linux_fcntl.h>
51 
52 #include <compat/linux/linux_syscallargs.h>
53 
54 /*
55  * The Alpha version of sys_pipe.
56  *
57  * Linux returns fd[1] in a4
58  * and fd[0] in the retval[0].
59  */
60 
61 
62 int
linux_sys_pipe(struct lwp * l,const void * v,register_t * retval)63 linux_sys_pipe(struct lwp *l, const void *v, register_t *retval)
64 {
65 	int fd[2], error;
66 
67 	if ((error = pipe1(l, fd, 0)))
68 		return error;
69 
70 	retval[0] = fd[0];
71 	(l->l_md.md_tf)->tf_regs[FRAME_A4] = fd[1];
72 	return 0;
73 }
74 
75 int
linux_sys_pipe2(struct lwp * l,const struct linux_sys_pipe2_args * uap,register_t * retval)76 linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap,
77     register_t *retval)
78 {
79 	/* {
80 		syscallarg(int *) pfds;
81 		syscallarg(int) flags;
82 	} */
83 	int fd[2], error, flags;
84 
85 	flags = linux_to_bsd_ioflags(SCARG(uap, flags));
86 	if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0)
87 		return EINVAL;
88 
89 	if ((error = pipe1(l, fd, flags)))
90 		return error;
91 
92 	retval[0] = fd[0];
93 	(l->l_md.md_tf)->tf_regs[FRAME_A4] = fd[1];
94 
95 	return 0;
96 }
97