linux_pipe.c revision 1.66
1/* $NetBSD: linux_pipe.c,v 1.66 2014/06/01 13:42:12 njoly 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 1.66 2014/06/01 13:42:12 njoly 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/fcntl.h> 43#include <sys/filedesc.h> 44 45#include <sys/sched.h> 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_ipc.h> 52#include <compat/linux/common/linux_sem.h> 53#include <compat/linux/common/linux_fcntl.h> 54 55#include <compat/linux/linux_syscallargs.h> 56 57/* Used on: arm, i386, m68k, ppc, amd64 */ 58/* Not used on: alpha, mips, sparc, sparc64 */ 59/* Alpha, mips, sparc and sparc64 pass one of the fds in a register */ 60 61/* 62 * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1]. 63 * Linux directly passes the pointer. 64 */ 65static int 66linux_pipe_return(struct lwp *l, int *pfds, register_t *retval) 67{ 68 int error; 69 70 if (sizeof(*retval) != sizeof(*pfds)) { 71 /* On amd64, sizeof(register_t) != sizeof(int) */ 72 int rpfds[2]; 73 rpfds[0] = (int)retval[0]; 74 rpfds[1] = (int)retval[1]; 75 76 if ((error = copyout(rpfds, pfds, sizeof(rpfds)))) 77 return error; 78 } else { 79 if ((error = copyout(retval, pfds, 2 * sizeof(*pfds)))) 80 return error; 81 } 82 retval[0] = 0; 83 return 0; 84} 85 86int 87linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, 88 register_t *retval) 89{ 90 /* { 91 syscallarg(int *) pfds; 92 } */ 93 int error; 94 95 if ((error = pipe1(l, retval, 0))) 96 return error; 97 98 return linux_pipe_return(l, SCARG(uap, pfds), retval); 99} 100 101int 102linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap, 103 register_t *retval) 104{ 105 /* { 106 syscallarg(int *) pfds; 107 syscallarg(int) flags; 108 } */ 109 int error, flags; 110 111 flags = linux_to_bsd_ioflags(SCARG(uap, flags)); 112 if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0) 113 return EINVAL; 114 115 if ((error = pipe1(l, retval, flags))) 116 return error; 117 118 return linux_pipe_return(l, SCARG(uap, pfds), retval); 119} 120