J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2001-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | #include "jni.h" |
| 27 | #include "jni_util.h" |
| 28 | #include "jvm.h" |
| 29 | #include "io_util.h" |
| 30 | #include "io_util_md.h" |
| 31 | #include <string.h> |
| 32 | |
| 33 | void |
| 34 | fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags) |
| 35 | { |
| 36 | WITH_PLATFORM_STRING(env, path, ps) { |
| 37 | FD fd; |
| 38 | |
| 39 | #ifdef __linux__ |
| 40 | /* Remove trailing slashes, since the kernel won't */ |
| 41 | char *p = (char *)ps + strlen(ps) - 1; |
| 42 | while ((p > ps) && (*p == '/')) |
| 43 | *p-- = '\0'; |
| 44 | #endif |
| 45 | fd = JVM_Open(ps, flags, 0666); |
| 46 | if (fd >= 0) { |
| 47 | SET_FD(this, fd, fid); |
| 48 | } else { |
| 49 | throwFileNotFoundException(env, path); |
| 50 | } |
| 51 | } END_PLATFORM_STRING(env, ps); |
| 52 | } |
| 53 | |
| 54 | |
| 55 | void |
| 56 | fileClose(JNIEnv *env, jobject this, jfieldID fid) |
| 57 | { |
| 58 | FD fd = GET_FD(this, fid); |
| 59 | if (fd == -1) { |
| 60 | return; |
| 61 | } |
| 62 | |
| 63 | /* Set the fd to -1 before closing it so that the timing window |
| 64 | * of other threads using the wrong fd (closed but recycled fd, |
| 65 | * that gets re-opened with some other filename) is reduced. |
| 66 | * Practically the chance of its occurance is low, however, we are |
| 67 | * taking extra precaution over here. |
| 68 | */ |
| 69 | SET_FD(this, -1, fid); |
| 70 | |
| 71 | /* |
| 72 | * Don't close file descriptors 0, 1, or 2. If we close these stream |
| 73 | * then a subsequent file open or socket will use them. Instead we |
| 74 | * just redirect these file descriptors to /dev/null. |
| 75 | */ |
| 76 | if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) { |
| 77 | int devnull = open("/dev/null", O_WRONLY); |
| 78 | if (devnull < 0) { |
| 79 | SET_FD(this, fd, fid); // restore fd |
| 80 | JNU_ThrowIOExceptionWithLastError(env, "open /dev/null failed"); |
| 81 | } else { |
| 82 | dup2(devnull, fd); |
| 83 | close(devnull); |
| 84 | } |
| 85 | } else if (JVM_Close(fd) == -1) { |
| 86 | SET_FD(this, fd, fid); // restore fd |
| 87 | printf("JVM_Close returned -1\n"); |
| 88 | JNU_ThrowIOExceptionWithLastError(env, "close failed"); |
| 89 | } |
| 90 | } |