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