/*
 * @(#)java_md.c	1.76 07/03/27
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

#include "java.h"
#include <dirent.h>
#include <dlfcn.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include "manifest_info.h"
#include "version_comp.h"

#ifdef __linux__
#include <pthread.h>
#else
#include <thread.h>
#endif

#define JVM_DLL "libjvm.so"
#define JAVA_DLL "libjava.so"

/*
 * If a processor / os combination has the ability to run binaries of
 * two data models and cohabitation of jre/jdk bits with both data
 * models is supported, then DUAL_MODE is defined.  When DUAL_MODE is
 * defined, the architecture names for the narrow and wide version of
 * the architecture are defined in LIBARCH64NAME and LIBARCH32NAME.  Currently
 * only Solaris on sparc/sparcv9 and i586/amd64 is DUAL_MODE; linux
 * i586/amd64 could be defined as DUAL_MODE but that is not the
 * current policy.
 */

#ifndef LIBARCHNAME
#  error "The macro LIBARCHNAME was not defined on the compile line"
#endif

#ifdef __sun
#  define DUAL_MODE
#  ifndef LIBARCH32NAME
#    error "The macro LIBARCH32NAME was not defined on the compile line"
#  endif
#  ifndef LIBARCH64NAME
#    error "The macro LIBARCH64NAME was not defined on the compile line"
#  endif
#  include <sys/systeminfo.h>
#  include <sys/elf.h>
#  include <stdio.h>
#endif

/* pointer to environment */
extern char **environ;

/*
 *      A collection of useful strings. One should think of these as #define
 *      entries, but actual strings can be more efficient (with many compilers).
 */
#ifdef __linux__
static const char *system_dir	= "/usr/java";
static const char *user_dir	= "/java";
#else /* Solaris */
static const char *system_dir	= "/usr/jdk";
static const char *user_dir	= "/jdk";
#endif

/*
 * Flowchart of launcher execs and options processing on unix
 *
 * The selection of the proper vm shared library to open depends on
 * several classes of command line options, including vm "flavor"
 * options (-client, -server) and the data model options, -d32  and
 * -d64, as well as a version specification which may have come from
 * the command line or from the manifest of an executable jar file.
 * The vm selection options are not passed to the running
 * virtual machine; they must be screened out by the launcher.
 *
 * The version specification (if any) is processed first by the
 * platform independent routine SelectVersion.  This may result in
 * the exec of the specified launcher version.
 *
 * Typically, the launcher execs at least once to ensure a suitable
 * LD_LIBRARY_PATH is in effect for the process.  The first exec
 * screens out all the data model options; leaving the choice of data
 * model implicit in the binary selected to run.  However, in case no
 * exec is done, the data model options are screened out before the vm
 * is invoked.
 *
 *  incoming argv ------------------------------
 *  |                                          |
 * \|/                                         |
 * CheckJVMType                                |