/*

 * Copyright (c) 1999, 2013, 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.

 *

 */

// no precompiled headers

#include "classfile/classLoader.hpp"

#include "classfile/systemDictionary.hpp"

#include "classfile/vmSymbols.hpp"

#include "code/icBuffer.hpp"

#include "code/vtableStubs.hpp"

#include "compiler/compileBroker.hpp"

#include "compiler/disassembler.hpp"

#include "interpreter/interpreter.hpp"

#include "jvm_bsd.h"

#include "memory/allocation.inline.hpp"

#include "memory/filemap.hpp"

#include "mutex_bsd.inline.hpp"

#include "oops/oop.inline.hpp"

#include "os_share_bsd.hpp"

#include "prims/jniFastGetField.hpp"

#include "prims/jvm.h"

#include "prims/jvm_misc.hpp"

#include "runtime/arguments.hpp"

#include "runtime/extendedPC.hpp"

#include "runtime/globals.hpp"

#include "runtime/interfaceSupport.hpp"

#include "runtime/java.hpp"

#include "runtime/javaCalls.hpp"

#include "runtime/mutexLocker.hpp"

#include "runtime/objectMonitor.hpp"

#include "runtime/osThread.hpp"

#include "runtime/perfMemory.hpp"

#include "runtime/sharedRuntime.hpp"

#include "runtime/statSampler.hpp"

#include "runtime/stubRoutines.hpp"

#include "runtime/thread.inline.hpp"

#include "runtime/threadCritical.hpp"

#include "runtime/timer.hpp"

#include "services/attachListener.hpp"

#include "services/memTracker.hpp"

#include "services/runtimeService.hpp"

#include "utilities/decoder.hpp"

#include "utilities/defaultStream.hpp"

#include "utilities/events.hpp"

#include "utilities/growableArray.hpp"

#include "utilities/vmError.hpp"

// put OS-includes here

# include <sys/types.h>

# include <sys/mman.h>

# include <sys/stat.h>

# include <sys/select.h>

# include <pthread.h>

# include <signal.h>

# include <errno.h>

# include <dlfcn.h>

# include <stdio.h>

# include <unistd.h>

# include <sys/resource.h>

# include <pthread.h>

# include <sys/stat.h>

# include <sys/time.h>

# include <sys/times.h>

# include <sys/utsname.h>

# include <sys/socket.h>

# include <sys/wait.h>

# include <time.h>

# include <pwd.h>

# include <poll.h>

# include <semaphore.h>

# include <fcntl.h>

# include <string.h>

# include <sys/param.h>

# include <sys/sysctl.h>

# include <sys/ipc.h>

# include <sys/shm.h>

#ifndef __APPLE__

# include <link.h>

#endif

# include <stdint.h>

# include <inttypes.h>

# include <sys/ioctl.h>

#if defined(__FreeBSD__) || defined(__NetBSD__)

# include <elf.h>

#endif

#ifdef __APPLE__

# include <mach/mach.h> // semaphore_* API

# include <mach-o/dyld.h>

# include <sys/proc_info.h>

# include <objc/objc-auto.h>

#endif

#ifndef MAP_ANONYMOUS

#define MAP_ANONYMOUS MAP_ANON

#endif

#define MAX_PATH    (2 * K)

// for timer info max values which include all bits

#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)

#define LARGEPAGES_BIT (1 << 6)

////////////////////////////////////////////////////////////////////////////////

// global variables

julong os::Bsd::_physical_memory = 0;

int (*os::Bsd::_clock_gettime)(clockid_t, struct timespec *) = NULL;

pthread_t os::Bsd::_main_thread;

int os::Bsd::_page_size = -1;

static jlong initial_time_count=0;

static int clock_tics_per_sec = 100;

// For diagnostics to print a message once. see run_periodic_checks

static sigset_t check_signal_done;

static bool check_signals = true;

static pid_t _initial_pid = 0;

/* Signal number used to suspend/resume a thread */

/* do not use any signal number less than SIGSEGV, see 4355769 */

static int SR_signum = SIGUSR2;

sigset_t SR_sigset;

////////////////////////////////////////////////////////////////////////////////

// utility functions

static int SR_initialize();

static int SR_finalize();

julong os::available_memory() {

  return Bsd::available_memory();

}

julong os::Bsd::available_memory() {

  // XXXBSD: this is just a stopgap implementation

  return physical_memory() >> 2;

}

julong os::physical_memory() {

  return Bsd::physical_memory();

}

julong os::allocatable_physical_memory(julong size) {

#ifdef _LP64

  return size;

#else

  julong result = MIN2(size, (julong)3800*M);

   if (!is_allocatable(result)) {

     // See comments under solaris for alignment considerations

     julong reasonable_size = (julong)2*G - 2 * os::vm_page_size();

     result =  MIN2(size, reasonable_size);

   }

   return result;

#endif // _LP64

}

////////////////////////////////////////////////////////////////////////////////

// environment support

bool os::getenv(const char* name, char* buf, int len) {

  const char* val = ::getenv(name);

  if (val != NULL && strlen(val) < (size_t)len) {

    strcpy(buf, val);

    return true;

  }

  if (len > 0) buf[0] = 0;  // return a null string

  return false;

}

// Return true if user is running as root.

bool os::have_special_privileges() {

  static bool init = false;

  static bool privileges = false;

  if (!init) {

    privileges = (getuid() != geteuid()) || (getgid() != getegid());

    init = true;

  }

  return privileges;

}

// Cpu architecture string

#if   defined(ZERO)

static char cpu_arch[] = ZERO_LIBARCH;

#elif defined(IA64)

static char cpu_arch[] = "ia64";

#elif defined(IA32)

static char cpu_arch[] = "i386";

#elif defined(AMD64)

static char cpu_arch[] = "amd64";

#elif defined(ARM)

static char cpu_arch[] = "arm";

#elif defined(PPC)

static char cpu_arch[] = "ppc";

#elif defined(SPARC)

#  ifdef _LP64

static char cpu_arch[] = "sparcv9";

#  else

static char cpu_arch[] = "sparc";

#  endif

#else

#error Add appropriate cpu_arch setting

#endif

// Compiler variant

#ifdef COMPILER2

#define COMPILER_VARIANT "server"

#else

#define COMPILER_VARIANT "client"

#endif

void os::Bsd::initialize_system_info() {

  int mib[2];

  size_t len;

  int cpu_val;

  julong mem_val;

  /* get processors count via hw.ncpus sysctl */

  mib[0] = CTL_HW;

  mib[1] = HW_NCPU;

  len = sizeof(cpu_val);

  if (sysctl(mib, 2, &cpu_val, &len, NULL, 0) != -1 && cpu_val >= 1) {

       assert(len == sizeof(cpu_val), "unexpected data size");

       set_processor_count(cpu_val);

  }

  else {

       set_processor_count(1);   // fallback

  }

  /* get physical memory via hw.memsize sysctl (hw.memsize is used

   * since it returns a 64 bit value)

   */

  mib[0] = CTL_HW;

  mib[1] = HW_MEMSIZE;

  len = sizeof(mem_val);

  if (sysctl(mib, 2, &mem_val, &len, NULL, 0) != -1) {

       assert(len == sizeof(mem_val), "unexpected data size");

       _physical_memory = mem_val;

  } else {

       _physical_memory = 256*1024*1024;       // fallback (XXXBSD?)

  }

#ifdef __OpenBSD__

  {

       // limit _physical_memory memory view on OpenBSD since

       // datasize rlimit restricts us anyway.

       struct rlimit limits;

       getrlimit(RLIMIT_DATA, &limits);

       _physical_memory = MIN2(_physical_memory, (julong)limits.rlim_cur);

  }

#endif

}

#ifdef __APPLE__

static const char *get_home() {

  const char *home_dir = ::getenv("HOME");

  if ((home_dir == NULL) || (*home_dir == '\0')) {

    struct passwd *passwd_info = getpwuid(geteuid());

    if (passwd_info != NULL) {

      home_dir = passwd_info->pw_dir;

    }

  }

  return home_dir;

}

#endif

void os::init_system_properties_values() {

//  char arch[12];

//  sysinfo(SI_ARCHITECTURE, arch, sizeof(arch));

  // The next steps are taken in the product version:

  //

  // Obtain the JAVA_HOME value from the location of libjvm.so.

  // This library should be located at:

  // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so.

  //

  // If "/jre/lib/" appears at the right place in the path, then we

  // assume libjvm.so is installed in a JDK and we use this path.

  //

  // Otherwise exit with message: "Could not create the Java virtual machine."

  //

  // The following extra steps are taken in the debugging version:

  //

  // If "/jre/lib/" does NOT appear at the right place in the path

  // instead of exit check for $JAVA_HOME environment variable.

  //

  // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>,

  // then we append a fake suffix "hotspot/libjvm.so" to this path so

  // it looks like libjvm.so is installed there

  // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so.

  //

  // Otherwise exit.

  //

  // Important note: if the location of libjvm.so changes this

  // code needs to be changed accordingly.

  // The next few definitions allow the code to be verbatim:

#define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal)

#define getenv(n) ::getenv(n)

/*

 * See ld(1):

 *      The linker uses the following search paths to locate required

 *      shared libraries:

 *        1: ...

 *        ...

 *        7: The default directories, normally /lib and /usr/lib.

 */

#ifndef DEFAULT_LIBPATH

#define DEFAULT_LIBPATH "/lib:/usr/lib"

#endif

#define EXTENSIONS_DIR  "/lib/ext"

#define ENDORSED_DIR    "/lib/endorsed"

#define REG_DIR         "/usr/java/packages"

#ifdef __APPLE__

#define SYS_EXTENSIONS_DIR   "/Library/Java/Extensions"

#define SYS_EXTENSIONS_DIRS  SYS_EXTENSIONS_DIR ":/Network" SYS_EXTENSIONS_DIR ":/System" SYS_EXTENSIONS_DIR ":/usr/lib/java"

        const char *user_home_dir = get_home();

        // the null in SYS_EXTENSIONS_DIRS counts for the size of the colon after user_home_dir

        int system_ext_size = strlen(user_home_dir) + sizeof(SYS_EXTENSIONS_DIR) +

            sizeof(SYS_EXTENSIONS_DIRS);

#endif

  {

    /* sysclasspath, java_home, dll_dir */

    {

        char *home_path;

        char *dll_path;

        char *pslash;

        char buf[MAXPATHLEN];

        os::jvm_path(buf, sizeof(buf));

        // Found the full path to libjvm.so.

        // Now cut the path to <java_home>/jre if we can.

        *(strrchr(buf, '/')) = '\0';  /* get rid of /libjvm.so */

        pslash = strrchr(buf, '/');

        if (pslash != NULL)

            *pslash = '\0';           /* get rid of /{client|server|hotspot} */

        dll_path = malloc(strlen(buf) + 1);

        if (dll_path == NULL)

            return;

        strcpy(dll_path, buf);

        Arguments::set_dll_dir(dll_path);

        if (pslash != NULL) {

            pslash = strrchr(buf, '/');

            if (pslash != NULL) {

                *pslash = '\0';       /* get rid of /<arch> (/lib on macosx) */

#ifndef __APPLE__

                pslash = strrchr(buf, '/');

                if (pslash != NULL)

                    *pslash = '\0';   /* get rid of /lib */

#endif

            }

        }

        home_path = malloc(strlen(buf) + 1);

        if (home_path == NULL)

            return;

        strcpy(home_path, buf);

        Arguments::set_java_home(home_path);

        if (!set_boot_path('/', ':'))

            return;

    }

    /*

     * Where to look for native libraries

     *

     * Note: Due to a legacy implementation, most of the library path

     * is set in the launcher.  This was to accomodate linking restrictions

     * on legacy Bsd implementations (which are no longer supported).

     * Eventually, all the library path setting will be done here.

     *

     * However, to prevent the proliferation of improperly built native

     * libraries, the new path component /usr/java/packages is added here.

     * Eventually, all the library path setting will be done here.

     */

    {

        char *ld_library_path;

        /*

         * Construct the invariant part of ld_library_path. Note that the

         * space for the colon and the trailing null are provided by the

         * nulls included by the sizeof operator (so actually we allocate

         * a byte more than necessary).

         */

#ifdef __APPLE__

        ld_library_path = (char *) malloc(system_ext_size);

        sprintf(ld_library_path, "%s" SYS_EXTENSIONS_DIR ":" SYS_EXTENSIONS_DIRS, user_home_dir);

#else

        ld_library_path = (char *) malloc(sizeof(REG_DIR) + sizeof("/lib/") +

            strlen(cpu_arch) + sizeof(DEFAULT_LIBPATH));

        sprintf(ld_library_path, REG_DIR "/lib/%s:" DEFAULT_LIBPATH, cpu_arch);

#endif

        /*

         * Get the user setting of LD_LIBRARY_PATH, and prepended it.  It

         * should always exist (until the legacy problem cited above is

         * addressed).

         */

#ifdef __APPLE__

        // Prepend the default path with the JAVA_LIBRARY_PATH so that the app launcher code can specify a directory inside an app wrapper

        char *l = getenv("JAVA_LIBRARY_PATH");

        if (l != NULL) {

            char *t = ld_library_path;

            /* That's +1 for the colon and +1 for the trailing '\0' */

            ld_library_path = (char *) malloc(strlen(l) + 1 + strlen(t) + 1);

            sprintf(ld_library_path, "%s:%s", l, t);

            free(t);

        }

        char *v = getenv("DYLD_LIBRARY_PATH");

#else

        char *v = getenv("LD_LIBRARY_PATH");

#endif

        if (v != NULL) {

            char *t = ld_library_path;

            /* That's +1 for the colon and +1 for the trailing '\0' */

            ld_library_path = (char *) malloc(strlen(v) + 1 + strlen(t) + 1);

            sprintf(ld_library_path, "%s:%s", v, t);

            free(t);

        }

#ifdef __APPLE__

        // Apple's Java6 has "." at the beginning of java.library.path.

        // OpenJDK on Windows has "." at the end of java.library.path.

        // OpenJDK on Linux and Solaris don't have "." in java.library.path

        // at all. To ease the transition from Apple's Java6 to OpenJDK7,

        // "." is appended to the end of java.library.path. Yes, this

        // could cause a change in behavior, but Apple's Java6 behavior

        // can be achieved by putting "." at the beginning of the

        // JAVA_LIBRARY_PATH environment variable.

        {

            char *t = ld_library_path;

            // that's +3 for appending ":." and the trailing '\0'

            ld_library_path = (char *) malloc(strlen(t) + 3);

            sprintf(ld_library_path, "%s:%s", t, ".");

            free(t);

        }

#endif

        Arguments::set_library_path(ld_library_path);

    }

    /*

     * Extensions directories.

     *

     * Note that the space for the colon and the trailing null are provided

     * by the nulls included by the sizeof operator (so actually one byte more

     * than necessary is allocated).

     */

    {

#ifdef __APPLE__

        char *buf = malloc(strlen(Arguments::get_java_home()) +

            sizeof(EXTENSIONS_DIR) + system_ext_size);

        sprintf(buf, "%s" SYS_EXTENSIONS_DIR ":%s" EXTENSIONS_DIR ":"

            SYS_EXTENSIONS_DIRS, user_home_dir, Arguments::get_java_home());

#else

        char *buf = malloc(strlen(Arguments::get_java_home()) +

            sizeof(EXTENSIONS_DIR) + sizeof(REG_DIR) + sizeof(EXTENSIONS_DIR));

        sprintf(buf, "%s" EXTENSIONS_DIR ":" REG_DIR EXTENSIONS_DIR,

            Arguments::get_java_home());

#endif

        Arguments::set_ext_dirs(buf);

    }

    /* Endorsed standards default directory. */

    {

        char * buf;

        buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR));

        sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home());

        Arguments::set_endorsed_dirs(buf);

    }

  }

#ifdef __APPLE__

#undef SYS_EXTENSIONS_DIR

#endif

#undef malloc

#undef getenv

#undef EXTENSIONS_DIR