FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_pipe.c

     /*      $NetBSD: linux_pipe.c,v 1.63 2008/06/18 12:24:18 tsutsui Exp $  */
     
     /*-
      * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Frank van der Linden and Eric Haszlakiewicz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     * POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: linux_pipe.c,v 1.63 2008/06/18 12:24:18 tsutsui Exp $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/mman.h>
    #include <sys/mount.h>
    
    #include <sys/sched.h>
    #include <sys/syscallargs.h>
    
    #include <compat/linux/common/linux_types.h>
    #include <compat/linux/common/linux_mmap.h>
    #include <compat/linux/common/linux_signal.h>
    #include <compat/linux/common/linux_ipc.h>
    #include <compat/linux/common/linux_sem.h>
    
    #include <compat/linux/linux_syscallargs.h>
    
    /* Used on: arm, i386, m68k, ppc, amd64 */
    /* Not used on: alpha, mips, sparc, sparc64 */
    /* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
    
    /*
     * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
     * Linux directly passes the pointer.
     */
    int
    linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, register_t *retval)
    {
            /* {
                    syscallarg(int *) pfds;
            } */
            int error;
    #ifdef __amd64__
            int pfds[2];
    #endif
    
            if ((error = sys_pipe(l, 0, retval)))
                    return error;
    
    #ifndef __amd64__
            /* Assumes register_t is an int */
            if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
                    return error;
    #else
            /* On amd64, sizeof(register_t) != sizeof(int) */
            pfds[0] = (int)retval[0];
            pfds[1] = (int)retval[1];
    
            if ((error = copyout(pfds, SCARG(uap, pfds), sizeof(pfds))))
                    return error;
    #endif
    
            retval[0] = 0;
            return 0;
    }

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