1 /* $NetBSD: linux_pipe.c,v 1.18 2017/12/26 08:30:57 kamil 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 1.18 2017/12/26 08:30:57 kamil 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/proc.h> 42 #include <sys/filedesc.h> 43 #include <sys/fcntl.h> 44 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_fcntl.h> 51 52 #include <compat/linux/linux_syscallargs.h> 53 54 /* 55 * The Alpha version of sys_pipe. 56 * 57 * Linux returns fd[1] in a4 58 * and fd[0] in the retval[0]. 59 */ 60 61 62 int 63 linux_sys_pipe(struct lwp *l, const void *v, register_t *retval) 64 { 65 int fd[2], error; 66 67 if ((error = pipe1(l, fd, 0))) 68 return error; 69 70 retval[0] = fd[0]; 71 (l->l_md.md_tf)->tf_regs[FRAME_A4] = fd[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 fd[2], error, flags; 84 85 flags = linux_to_bsd_ioflags(SCARG(uap, flags)); 86 if ((flags & ~(O_CLOEXEC|O_NONBLOCK)) != 0) 87 return EINVAL; 88 89 if ((error = pipe1(l, fd, flags))) 90 return error; 91 92 retval[0] = fd[0]; 93 (l->l_md.md_tf)->tf_regs[FRAME_A4] = fd[1]; 94 95 return 0; 96 } 97