| /* |
| * Copyright (c) 2015, 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 <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/mman.h> |
| #include <fcntl.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| |
| #include "jni.h" |
| #include "osSupport.hpp" |
| |
| /** |
| * Open a regular file read-only. |
| * Return the file descriptor. |
| */ |
| jint osSupport::openReadOnly(const char *path) { |
| return ::open(path, 0); |
| } |
| |
| /** |
| * Close a file descriptor. |
| */ |
| jint osSupport::close(jint fd) { |
| return ::close(fd); |
| } |
| |
| /** |
| * Return the size of a regular file. |
| */ |
| jlong osSupport::size(const char *path) { |
| struct stat statbuf; |
| if (stat(path, &statbuf) < 0 || |
| (statbuf.st_mode & S_IFREG) != S_IFREG) { |
| return -1; |
| } |
| return (jsize) statbuf.st_size; |
| } |
| |
| /** |
| * Read nBytes at offset into a buffer. |
| */ |
| jlong osSupport::read(jint fd, char *buf, jlong nBytes, jlong offset) { |
| return ::pread(fd, buf, nBytes, offset); |
| } |
| |
| /** |
| * Map nBytes at offset into memory and return the address. |
| * The system chooses the address. |
| */ |
| void* osSupport::map_memory(int fd, const char *filename, size_t file_offset, size_t bytes) { |
| void* mapped_address = NULL; |
| mapped_address = (void*) mmap(NULL, |
| bytes, PROT_READ, MAP_SHARED, |
| fd, file_offset); |
| if (mapped_address == MAP_FAILED) { |
| return NULL; |
| } |
| return mapped_address; |
| } |
| |
| /** |
| * Unmap nBytes of memory at address. |
| */ |
| int osSupport::unmap_memory(void *addr, size_t bytes) { |
| return munmap((char *) addr, bytes) == 0; |
| } |
| |
| /** |
| * A CriticalSection to protect a small section of code. |
| */ |
| void SimpleCriticalSection::enter() { |
| pthread_mutex_lock(&mutex); |
| } |
| |
| void SimpleCriticalSection::exit() { |
| pthread_mutex_unlock(&mutex); |
| |
| } |
| |
| SimpleCriticalSection::SimpleCriticalSection() { |
| pthread_mutex_init(&mutex, NULL); |
| } |
| |
| //SimpleCriticalSection::~SimpleCriticalSection() { |
| // pthread_mutex_destroy(&mutex); |
| //} |
| |