sys/compat/linux/common/linux_pipe.c

   1 /*      $NetBSD: linux_pipe.c,v 1.62 2008/04/28 20:23:43 martin Exp $   */
   2
   3 /*-
   4  * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Frank van der Linden and 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 1.62 2008/04/28 20:23:43 martin Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/malloc.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/mman.h>
  41 #include <sys/mount.h>
  42
  43 #include <sys/sched.h>
  44 #include <sys/syscallargs.h>
  45
  46 #include <compat/linux/common/linux_types.h>
  47 #include <compat/linux/common/linux_mmap.h>
  48 #include <compat/linux/common/linux_signal.h>
  49 #include <compat/linux/common/linux_ipc.h>
  50 #include <compat/linux/common/linux_sem.h>
  51
  52 #include <compat/linux/linux_syscallargs.h>
  53
  54 /* Used on: arm, i386, m68k, ppc, amd64 */
  55 /* Not used on: alpha, mips, sparc, sparc64 */
  56 /* Alpha, mips, sparc and sparc64 pass one of the fds in a register */
  57
  58 /*
  59  * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1].
  60  * Linux directly passes the pointer.
  61  */
  62 int
  63 linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, register_t *retval)
  64 {
  65         /* {
  66                 syscallarg(int *) pfds;
  67         } */
  68         int error;
  69 #ifdef __amd64__
  70         int pfds[2];
  71 #endif
  72
  73         if ((error = sys_pipe(l, 0, retval)))
  74                 return error;
  75
  76 #ifndef __amd64__
  77         /* Assumes register_t is an int */
  78         if ((error = copyout(retval, SCARG(uap, pfds), 2 * sizeof (int))))
  79                 return error;
  80 #else
  81         /* On amd64, sizeof(register_t) != sizeof(int) */
  82         pfds[0] = (int)retval[0];
  83         pfds[1] = (int)retval[1];
  84
  85         if ((error = copyout(pfds, SCARG(uap, pfds), sizeof(pfds))))
  86                 return error;
  87 #endif
  88
  89         retval[0] = 0;
  90         return 0;
  91 }