Mercurial > hg > jdk9-shenandoah > jdk
view src/java.base/unix/native/libjimage/osSupport_unix.cpp @ 12737:d7f0c840a572
8087181: Move native jimage code to its own library (maybe libjimage)
Reviewed-by: alanb, lfoltan, hseigel, acorn
Contributed-by: james.laskey@oracle.com, jean-francois.denise@oracle.com, roger.riggs@oracle.com
author | jlaskey |
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date | Fri, 04 Sep 2015 10:11:43 -0300 |
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/* * 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. * * 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); //}