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      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
     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
     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