sys/compat/linux/arch/alpha/linux_pipe.c

   1 /*      $NetBSD: linux_pipe.c,v 1.12 2007/12/20 23:02:51 dsl 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 1.12 2007/12/20 23:02:51 dsl 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 #include <sys/proc.h>
  43
  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
  50 #include <compat/linux/linux_syscallargs.h>
  51
  52 /*
  53  * The Alpha version of sys_pipe.
  54  *
  55  * Linux returns fd[1] in a4
  56  * and fd[0] in the retval[0].
  57  */
  58
  59
  60 int
  61 linux_sys_pipe(struct lwp *l, const void *v, register_t *retval)
  62 {
  63         int error;
  64
  65         if ((error = sys_pipe(l, 0, retval)))
  66                 return error;
  67
  68         (l->l_md.md_tf)->tf_regs[FRAME_A4] = retval[1];
  69         return 0;
  70 }