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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 27 /* All Rights Reserved */ 28 29 30 #pragma ident "%Z%%M% %I% %E% SMI" /* from SVr4.0 1.11 */ 31 32 #include <sys/types.h> 33 #include <sys/sysmacros.h> 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/cred.h> 37 #include <sys/user.h> 38 #include <sys/vnode.h> 39 #include <sys/file.h> 40 #include <sys/stream.h> 41 #include <sys/strsubr.h> 42 #include <sys/errno.h> 43 #include <sys/debug.h> 44 #include <sys/fs/fifonode.h> 45 46 /* 47 * This is the loadable module wrapper. 48 */ 49 #include <sys/modctl.h> 50 #include <sys/syscall.h> 51 52 char _depends_on[] = "fs/fifofs"; 53 54 longlong_t pipe(); 55 56 static struct sysent pipe_sysent = { 57 0, 58 SE_32RVAL1 | SE_32RVAL2 | SE_NOUNLOAD | SE_ARGC, 59 (int (*)())pipe 60 }; 61 62 /* 63 * Module linkage information for the kernel. 64 */ 65 static struct modlsys modlsys = { 66 &mod_syscallops, "pipe(2) syscall", &pipe_sysent 67 }; 68 69 #ifdef _SYSCALL32_IMPL 70 static struct modlsys modlsys32 = { 71 &mod_syscallops32, "32-bit pipe(2) syscall", &pipe_sysent 72 }; 73 #endif 74 75 static struct modlinkage modlinkage = { 76 MODREV_1, 77 &modlsys, 78 #ifdef _SYSCALL32_IMPL 79 &modlsys32, 80 #endif 81 NULL 82 }; 83 84 int 85 _init(void) 86 { 87 return (mod_install(&modlinkage)); 88 } 89 90 int 91 _fini(void) 92 { 93 return (EBUSY); 94 } 95 96 int 97 _info(struct modinfo *modinfop) 98 { 99 return (mod_info(&modlinkage, modinfop)); 100 } 101 102 /* 103 * pipe(2) system call. 104 * Create a pipe by connecting two streams together. Associate 105 * each end of the pipe with a vnode, a file descriptor and 106 * one of the streams. 107 */ 108 longlong_t 109 pipe() 110 { 111 vnode_t *vp1, *vp2; 112 struct file *fp1, *fp2; 113 int error = 0; 114 int fd1, fd2; 115 rval_t r; 116 117 /* 118 * Allocate and initialize two vnodes. 119 */ 120 makepipe(&vp1, &vp2); 121 122 /* 123 * Allocate and initialize two file table entries and two 124 * file pointers. Each file pointer is open for read and 125 * write. 126 */ 127 if (error = falloc(vp1, FWRITE|FREAD, &fp1, &fd1)) { 128 VN_RELE(vp1); 129 VN_RELE(vp2); 130 return ((longlong_t)set_errno(error)); 131 } 132 133 if (error = falloc(vp2, FWRITE|FREAD, &fp2, &fd2)) 134 goto out2; 135 136 /* 137 * Create two stream heads and attach to each vnode. 138 */ 139 if (error = fifo_stropen(&vp1, FWRITE|FREAD, fp1->f_cred, 0, 0)) 140 goto out; 141 142 if (error = fifo_stropen(&vp2, FWRITE|FREAD, fp2->f_cred, 0, 0)) { 143 (void) VOP_CLOSE(vp1, FWRITE|FREAD, 1, (offset_t)0, 144 fp1->f_cred, NULL); 145 goto out; 146 } 147 148 strmate(vp1, vp2); 149 150 VTOF(vp1)->fn_ino = VTOF(vp2)->fn_ino = fifogetid(); 151 152 /* 153 * Now fill in the entries that falloc reserved 154 */ 155 mutex_exit(&fp1->f_tlock); 156 mutex_exit(&fp2->f_tlock); 157 setf(fd1, fp1); 158 setf(fd2, fp2); 159 160 /* 161 * Return the file descriptors to the user. They now 162 * point to two different vnodes which have different 163 * stream heads. 164 */ 165 r.r_val1 = fd1; 166 r.r_val2 = fd2; 167 return (r.r_vals); 168 out: 169 unfalloc(fp2); 170 setf(fd2, NULL); 171 out2: 172 unfalloc(fp1); 173 setf(fd1, NULL); 174 VN_RELE(vp1); 175 VN_RELE(vp2); 176 return ((longlong_t)set_errno(error)); 177 } 178