| /* |
| * Copyright (c) 2001, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jvm.h" |
| #include "io_util.h" |
| #include "io_util_md.h" |
| #include <string.h> |
| #include <unistd.h> |
| |
| #ifdef __solaris__ |
| #include <sys/filio.h> |
| #endif |
| |
| #if defined(__linux__) || defined(_ALLBSD_SOURCE) || defined(_AIX) |
| #include <sys/ioctl.h> |
| #endif |
| |
| #ifdef MACOSX |
| |
| #include <CoreFoundation/CoreFoundation.h> |
| |
| __private_extern__ |
| jstring newStringPlatform(JNIEnv *env, const char* str) |
| { |
| jstring rv = NULL; |
| CFMutableStringRef csref = CFStringCreateMutable(NULL, 0); |
| if (csref == NULL) { |
| JNU_ThrowOutOfMemoryError(env, "native heap"); |
| } else { |
| CFStringAppendCString(csref, str, kCFStringEncodingUTF8); |
| CFStringNormalize(csref, kCFStringNormalizationFormC); |
| int clen = CFStringGetLength(csref); |
| int ulen = (clen + 1) * 2; // utf16 + zero padding |
| char* chars = malloc(ulen); |
| if (chars == NULL) { |
| CFRelease(csref); |
| JNU_ThrowOutOfMemoryError(env, "native heap"); |
| } else { |
| if (CFStringGetCString(csref, chars, ulen, kCFStringEncodingUTF16)) { |
| rv = (*env)->NewString(env, (jchar*)chars, clen); |
| } |
| free(chars); |
| CFRelease(csref); |
| } |
| } |
| return rv; |
| } |
| #endif |
| |
| FD |
| handleOpen(const char *path, int oflag, int mode) { |
| FD fd; |
| RESTARTABLE(open64(path, oflag, mode), fd); |
| if (fd != -1) { |
| struct stat64 buf64; |
| int result; |
| RESTARTABLE(fstat64(fd, &buf64), result); |
| if (result != -1) { |
| if (S_ISDIR(buf64.st_mode)) { |
| close(fd); |
| errno = EISDIR; |
| fd = -1; |
| } |
| } else { |
| close(fd); |
| fd = -1; |
| } |
| } |
| return fd; |
| } |
| |
| void |
| fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags) |
| { |
| WITH_PLATFORM_STRING(env, path, ps) { |
| FD fd; |
| |
| #if defined(__linux__) || defined(_ALLBSD_SOURCE) |
| /* Remove trailing slashes, since the kernel won't */ |
| char *p = (char *)ps + strlen(ps) - 1; |
| while ((p > ps) && (*p == '/')) |
| *p-- = '\0'; |
| #endif |
| fd = handleOpen(ps, flags, 0666); |
| if (fd != -1) { |
| jobject fdobj; |
| jboolean append; |
| SET_FD(this, fd, fid); |
| |
| fdobj = (*env)->GetObjectField(env, this, fid); |
| if (fdobj != NULL) { |
| append = (flags & O_APPEND) == 0 ? JNI_FALSE : JNI_TRUE; |
| (*env)->SetBooleanField(env, fdobj, IO_append_fdID, append); |
| } |
| } else { |
| throwFileNotFoundException(env, path); |
| } |
| } END_PLATFORM_STRING(env, ps); |
| } |
| |
| void |
| fileClose(JNIEnv *env, jobject this, jfieldID fid) |
| { |
| FD fd = GET_FD(this, fid); |
| if (fd == -1) { |
| return; |
| } |
| |
| /* Set the fd to -1 before closing it so that the timing window |
| * of other threads using the wrong fd (closed but recycled fd, |
| * that gets re-opened with some other filename) is reduced. |
| * Practically the chance of its occurance is low, however, we are |
| * taking extra precaution over here. |
| */ |
| SET_FD(this, -1, fid); |
| |
| /* |
| * Don't close file descriptors 0, 1, or 2. If we close these stream |
| * then a subsequent file open or socket will use them. Instead we |
| * just redirect these file descriptors to /dev/null. |
| */ |
| if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) { |
| int devnull = open("/dev/null", O_WRONLY); |
| if (devnull < 0) { |
| SET_FD(this, fd, fid); // restore fd |
| JNU_ThrowIOExceptionWithLastError(env, "open /dev/null failed"); |
| } else { |
| dup2(devnull, fd); |
| close(devnull); |
| } |
| } else if (close(fd) == -1) { |
| JNU_ThrowIOExceptionWithLastError(env, "close failed"); |
| } |
| } |
| |
| ssize_t |
| handleRead(FD fd, void *buf, jint len) |
| { |
| ssize_t result; |
| RESTARTABLE(read(fd, buf, len), result); |
| return result; |
| } |
| |
| ssize_t |
| handleWrite(FD fd, const void *buf, jint len) |
| { |
| ssize_t result; |
| RESTARTABLE(write(fd, buf, len), result); |
| return result; |
| } |
| |
| jint |
| handleAvailable(FD fd, jlong *pbytes) |
| { |
| int mode; |
| struct stat64 buf64; |
| jlong size = -1, current = -1; |
| |
| int result; |
| RESTARTABLE(fstat64(fd, &buf64), result); |
| if (result != -1) { |
| mode = buf64.st_mode; |
| if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { |
| int n; |
| int result; |
| RESTARTABLE(ioctl(fd, FIONREAD, &n), result); |
| if (result >= 0) { |
| *pbytes = n; |
| return 1; |
| } |
| } else if (S_ISREG(mode)) { |
| size = buf64.st_size; |
| } |
| } |
| |
| if ((current = lseek64(fd, 0, SEEK_CUR)) == -1) { |
| return 0; |
| } |
| |
| if (size < current) { |
| if ((size = lseek64(fd, 0, SEEK_END)) == -1) |
| return 0; |
| else if (lseek64(fd, current, SEEK_SET) == -1) |
| return 0; |
| } |
| |
| *pbytes = size - current; |
| return 1; |
| } |
| |
| jint |
| handleSetLength(FD fd, jlong length) |
| { |
| int result; |
| #if defined(__linux__) |
| /* |
| * On Linux, if the file size is being increased, then ftruncate64() |
| * will modify the metadata value of the size without actually allocating |
| * any blocks which can cause a SIGBUS error if the file is subsequently |
| * memory-mapped. |
| */ |
| struct stat64 sb; |
| |
| if (fstat64(fd, &sb) == 0 && length > sb.st_blocks*512) { |
| RESTARTABLE(fallocate64(fd, 0, 0, length), result); |
| // Return on success or if errno is neither EOPNOTSUPP nor ENOSYS |
| if (result == 0) { |
| return 0; |
| } else if (errno != EOPNOTSUPP && errno != ENOSYS) { |
| return result; |
| } |
| } |
| #endif |
| RESTARTABLE(ftruncate64(fd, length), result); |
| return result; |
| } |
| |
| jlong |
| handleGetLength(FD fd) |
| { |
| struct stat64 sb; |
| if (fstat64(fd, &sb) == 0) { |
| return sb.st_size; |
| } else { |
| return -1; |
| } |
| } |