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133 lines
3.8 KiB
C
133 lines
3.8 KiB
C
/* $NetBSD: linux_pipe.c,v 1.65 2011/04/14 00:59:06 christos Exp $ */
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/*-
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* Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank van der Linden and Eric Haszlakiewicz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: linux_pipe.c,v 1.65 2011/04/14 00:59:06 christos Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/fcntl.h>
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#include <sys/filedesc.h>
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#include <sys/sched.h>
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#include <sys/syscallargs.h>
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#include <compat/linux/common/linux_types.h>
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#include <compat/linux/common/linux_mmap.h>
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#include <compat/linux/common/linux_signal.h>
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#include <compat/linux/common/linux_ipc.h>
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#include <compat/linux/common/linux_sem.h>
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#include <compat/linux/common/linux_fcntl.h>
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#include <compat/linux/linux_syscallargs.h>
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/* Used on: arm, i386, m68k, ppc, amd64 */
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/* Not used on: alpha, mips, sparc, sparc64 */
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/* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
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/*
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* NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
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* Linux directly passes the pointer.
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*/
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static int
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linux_pipe_return(struct lwp *l, int *pfds, register_t *retval, int flags)
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{
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int error;
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if (sizeof(*retval) != sizeof(*pfds)) {
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/* On amd64, sizeof(register_t) != sizeof(int) */
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int rpfds[2];
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rpfds[0] = (int)retval[0];
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rpfds[1] = (int)retval[1];
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if ((error = copyout(rpfds, pfds, sizeof(rpfds))))
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return error;
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} else {
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if ((error = copyout(retval, pfds, 2 * sizeof(*pfds))))
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return error;
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}
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if (flags & LINUX_O_CLOEXEC) {
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fd_set_exclose(l, retval[0], true);
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fd_set_exclose(l, retval[1], true);
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}
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retval[0] = 0;
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return 0;
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}
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int
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linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(int *) pfds;
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} */
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int error;
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if ((error = pipe1(l, retval, 0)))
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return error;
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return linux_pipe_return(l, SCARG(uap, pfds), retval, 0);
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}
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int
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linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(int *) pfds;
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syscallarg(int) flags;
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} */
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int error;
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int flag = 0;
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switch (SCARG(uap, flags)) {
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case LINUX_O_CLOEXEC:
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break;
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case LINUX_O_NONBLOCK:
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case LINUX_O_NONBLOCK|LINUX_O_CLOEXEC:
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flag = O_NONBLOCK;
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break;
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default:
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return EINVAL;
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}
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if ((error = pipe1(l, retval, flag)))
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return error;
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return linux_pipe_return(l, SCARG(uap, pfds), retval,
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SCARG(uap, flags));
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}
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