1 /* $NetBSD: linux_pipe.c,v 1.65 2011/04/14 00:59:06 christos 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 1.65 2011/04/14 00:59:06 christos 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 */ 65 static int 66 linux_pipe_return(struct lwp *l, int *pfds, register_t *retval, int flags) 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 if (flags & LINUX_O_CLOEXEC) { 83 fd_set_exclose(l, retval[0], true); 84 fd_set_exclose(l, retval[1], true); 85 } 86 retval[0] = 0; 87 return 0; 88 } 89 90 int 91 linux_sys_pipe(struct lwp *l, const struct linux_sys_pipe_args *uap, 92 register_t *retval) 93 { 94 /* { 95 syscallarg(int *) pfds; 96 } */ 97 int error; 98 99 if ((error = pipe1(l, retval, 0))) 100 return error; 101 102 return linux_pipe_return(l, SCARG(uap, pfds), retval, 0); 103 } 104 105 int 106 linux_sys_pipe2(struct lwp *l, const struct linux_sys_pipe2_args *uap, 107 register_t *retval) 108 { 109 /* { 110 syscallarg(int *) pfds; 111 syscallarg(int) flags; 112 } */ 113 int error; 114 int flag = 0; 115 116 switch (SCARG(uap, flags)) { 117 case LINUX_O_CLOEXEC: 118 break; 119 case LINUX_O_NONBLOCK: 120 case LINUX_O_NONBLOCK|LINUX_O_CLOEXEC: 121 flag = O_NONBLOCK; 122 break; 123 default: 124 return EINVAL; 125 } 126 127 if ((error = pipe1(l, retval, flag))) 128 return error; 129 130 return linux_pipe_return(l, SCARG(uap, pfds), retval, 131 SCARG(uap, flags)); 132 } 133