1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 28 /* All Rights Reserved */ 29 30 31 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.11 */ 32 33 #include <sys/types.h> 34 #include <sys/sysmacros.h> 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/cred.h> 38 #include <sys/user.h> 39 #include <sys/vnode.h> 40 #include <sys/file.h> 41 #include <sys/stream.h> 42 #include <sys/strsubr.h> 43 #include <sys/errno.h> 44 #include <sys/debug.h> 45 #include <sys/fs/fifonode.h> 46 47 /* 48 * This is the loadable module wrapper. 49 */ 50 #include <sys/modctl.h> 51 #include <sys/syscall.h> 52 53 char _depends_on[] = "fs/fifofs"; 54 55 longlong_t pipe(); 56 57 static struct sysent pipe_sysent = { 58 0, 59 SE_32RVAL1 | SE_32RVAL2 | SE_NOUNLOAD | SE_ARGC, 60 (int (*)())pipe 61 }; 62 63 /* 64 * Module linkage information for the kernel. 65 */ 66 static struct modlsys modlsys = { 67 &mod_syscallops, "pipe(2) syscall", &pipe_sysent 68 }; 69 70 #ifdef _SYSCALL32_IMPL 71 static struct modlsys modlsys32 = { 72 &mod_syscallops32, "32-bit pipe(2) syscall", &pipe_sysent 73 }; 74 #endif 75 76 static struct modlinkage modlinkage = { 77 MODREV_1, 78 &modlsys, 79 #ifdef _SYSCALL32_IMPL 80 &modlsys32, 81 #endif 82 NULL 83 }; 84 85 int 86 _init(void) 87 { 88 return (mod_install(&modlinkage)); 89 } 90 91 int 92 _fini(void) 93 { 94 return (EBUSY); 95 } 96 97 int 98 _info(struct modinfo *modinfop) 99 { 100 return (mod_info(&modlinkage, modinfop)); 101 } 102 103 /* 104 * pipe(2) system call. 105 * Create a pipe by connecting two streams together. Associate 106 * each end of the pipe with a vnode, a file descriptor and 107 * one of the streams. 108 */ 109 longlong_t 110 pipe() 111 { 112 vnode_t *vp1, *vp2; 113 struct file *fp1, *fp2; 114 int error = 0; 115 int fd1, fd2; 116 rval_t r; 117 118 /* 119 * Allocate and initialize two vnodes. 120 */ 121 makepipe(&vp1, &vp2); 122 123 /* 124 * Allocate and initialize two file table entries and two 125 * file pointers. Each file pointer is open for read and 126 * write. 127 */ 128 if (error = falloc(vp1, FWRITE|FREAD, &fp1, &fd1)) { 129 VN_RELE(vp1); 130 VN_RELE(vp2); 131 return ((longlong_t)set_errno(error)); 132 } 133 134 if (error = falloc(vp2, FWRITE|FREAD, &fp2, &fd2)) 135 goto out2; 136 137 /* 138 * Create two stream heads and attach to each vnode. 139 */ 140 if (error = fifo_stropen(&vp1, FWRITE|FREAD, fp1->f_cred, 0, 0)) 141 goto out; 142 143 if (error = fifo_stropen(&vp2, FWRITE|FREAD, fp2->f_cred, 0, 0)) { 144 (void) VOP_CLOSE(vp1, FWRITE|FREAD, 1, (offset_t)0, 145 fp1->f_cred); 146 goto out; 147 } 148 149 strmate(vp1, vp2); 150 151 VTOF(vp1)->fn_ino = VTOF(vp2)->fn_ino = fifogetid(); 152 153 /* 154 * Now fill in the entries that falloc reserved 155 */ 156 mutex_exit(&fp1->f_tlock); 157 mutex_exit(&fp2->f_tlock); 158 setf(fd1, fp1); 159 setf(fd2, fp2); 160 161 /* 162 * Return the file descriptors to the user. They now 163 * point to two different vnodes which have different 164 * stream heads. 165 */ 166 r.r_val1 = fd1; 167 r.r_val2 = fd2; 168 return (r.r_vals); 169 out: 170 unfalloc(fp2); 171 setf(fd2, NULL); 172 out2: 173 unfalloc(fp1); 174 setf(fd1, NULL); 175 VN_RELE(vp1); 176 VN_RELE(vp2); 177 return ((longlong_t)set_errno(error)); 178 } 179