| 1 | /* $NetBSD: linux_pipe.c,v 1.67 2014/11/09 17:48:08 maxv 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 1.67 2014/11/09 17:48:08 maxv Exp $" ); |
| 34 | |
| 35 | #include <sys/param.h> |
| 36 | #include <sys/systm.h> |
| 37 | #include <sys/kernel.h> |
| 38 | #include <sys/mbuf.h> |
| 39 | #include <sys/mman.h> |
| 40 | #include <sys/mount.h> |
| 41 | #include <sys/fcntl.h> |
| 42 | #include <sys/filedesc.h> |
| 43 | |
| 44 | #include <sys/sched.h> |
| 45 | #include <sys/syscallargs.h> |
| 46 | |
| 47 | #include <compat/linux/common/linux_types.h> |
| 48 | #include <compat/linux/common/linux_mmap.h> |
| 49 | #include <compat/linux/common/linux_signal.h> |
| 50 | #include <compat/linux/common/linux_ipc.h> |
| 51 | #include <compat/linux/common/linux_sem.h> |
| 52 | #include <compat/linux/common/linux_fcntl.h> |
| 53 | |
| 54 | #include <compat/linux/linux_syscallargs.h> |
| 55 | |
| 56 | /* Used on: arm, i386, m68k, ppc, amd64 */ |
| 57 | /* Not used on: alpha, mips, sparc, sparc64 */ |
| 58 | /* Alpha, mips, sparc and sparc64 pass one of the fds in a register */ |
| 59 | |
| 60 | /* |
| 61 | * NetBSD passes fd[0] in retval[0], and fd[1] in retval[1]. |
| 62 | * Linux directly passes the pointer. |
| 63 | */ |
| 64 | static int |
| 65 | linux_pipe_return(struct lwp *l, int *pfds, register_t *retval) |
| 66 | { |
| 67 | int error; |
| 68 | |
| 69 | if (sizeof(*retval) != sizeof(*pfds)) { |
| 70 | /* On amd64, sizeof(register_t) != sizeof(int) */ |
| 71 | int rpfds[2]; |
| 72 | rpfds[0] = (int)retval[0]; |
| 73 | rpfds[1] = (int)retval[1]; |
| 74 | |
| 75 | if ((error = copyout(rpfds, pfds, sizeof(rpfds)))) |
| 76 | return error; |
| 77 | } else { |
| 78 | if ((error = copyout(retval, pfds, 2 * sizeof(*pfds)))) |
| 79 | return error; |
| 80 | } |
| 81 | retval[0] = 0; |
| 82 | return 0; |
| 83 | } |
| 84 | |
| 85 | int |
| 86 | linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, |
| 87 | register_t *retval) |
| 88 | { |
| 89 | /* { |
| 90 | syscallarg(int *) pfds; |
| 91 | } */ |
| 92 | int error; |
| 93 | |
| 94 | if ((error = pipe1(l, retval, 0))) |
| 95 | return error; |
| 96 | |
| 97 | return linux_pipe_return(l, SCARG(uap, pfds), retval); |
| 98 | } |
| 99 | |
| 100 | int |
| 101 | linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap, |
| 102 | register_t *retval) |
| 103 | { |
| 104 | /* { |
| 105 | syscallarg(int *) pfds; |
| 106 | syscallarg(int) flags; |
| 107 | } */ |
| 108 | int error, flags; |
| 109 | |
| 110 | flags = linux_to_bsd_ioflags(SCARG(uap, flags)); |
| 111 | if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0) |
| 112 | return EINVAL; |
| 113 | |
| 114 | if ((error = pipe1(l, retval, flags))) |
| 115 | return error; |
| 116 | |
| 117 | return linux_pipe_return(l, SCARG(uap, pfds), retval); |
| 118 | } |
| 119 | |