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linux_pipe.c revision 1.15 
      1 /*	$NetBSD: linux_pipe.c,v 1.15 2011/04/14 11:17:47 he 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 1.15 2011/04/14 11:17:47 he 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 #include <sys/filedesc.h>
     44 #include <sys/fcntl.h>
     45 
     46 #include <sys/syscallargs.h>
     47 
     48 #include <compat/linux/common/linux_types.h>
     49 #include <compat/linux/common/linux_mmap.h>
     50 #include <compat/linux/common/linux_signal.h>
     51 #include <compat/linux/common/linux_fcntl.h>
     52 
     53 #include <compat/linux/linux_syscallargs.h>
     54 
     55 /*
     56  * The Alpha version of sys_pipe.
     57  *
     58  * Linux returns fd[1] in a4
     59  * and fd[0] in the retval[0].
     60  */
     61 
     62 
     63 int
     64 linux_sys_pipe(struct lwp *l, const void *v, register_t *retval)
     65 {
     66 	int error;
     67 
     68 	if ((error = pipe1(l, retval, 0)))
     69 		return error;
     70 
     71 	(l->l_md.md_tf)->tf_regs[FRAME_A4] = retval[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 error;
     84 	int flag = 0;
     85 
     86 	switch (SCARG(uap, flags)) {
     87 	case LINUX_O_CLOEXEC:
     88 		break;
     89 	case LINUX_O_NONBLOCK:
     90 	case LINUX_O_NONBLOCK|LINUX_O_CLOEXEC:
     91 		flag = O_NONBLOCK;
     92 		break;
     93 	default:
     94 		return EINVAL;
     95 	}
     96 
     97 	if ((error = pipe1(l, retval, flag)))
     98 		return error;
     99 
    100 	(l->l_md.md_tf)->tf_regs[FRAME_A4] = retval[1];
    101 
    102 	if (SCARG(uap, flags) & LINUX_O_CLOEXEC) {
    103 		fd_set_exclose(l, retval[0], true);
    104 		fd_set_exclose(l, retval[1], true);
    105 	}
    106 	return 0;
    107 }
    108