os.c

jam vm 最新Java虚拟机！为开源项目源代码

/*
 * Copyright (C) 2003, 2004, 2005, 2006, 2007
 * Robert Lougher <[e-mail]>.
 *
 * This file is part of JamVM.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2,
 * or (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <pthread.h>

#ifndef __NetBSD__
#include <pthread_np.h>
#endif

#ifdef __OpenBSD__
#include <sys/signal.h>
#endif

#include "../../jam.h"

#ifdef __OpenBSD__
void *nativeStackBase() {
    stack_t sinfo;

    pthread_stackseg_np(pthread_self(), &sinfo);
    return sinfo.ss_sp;
}
#else
void *nativeStackBase() {
    pthread_attr_t attr;
    void *addr;
    int size;

    pthread_attr_init(&attr);
    pthread_attr_get_np(pthread_self(), &attr);
    pthread_attr_getstack(&attr, &addr, &size);

    return addr+size;
}
#endif

int nativeAvailableProcessors() {
    int processors, mib[2];
    size_t len = sizeof(processors);

    mib[0] = CTL_HW;
    mib[1] = HW_NCPU;

    if(sysctl(mib, 2, &processors, &len, NULL, 0) == -1)
        return 1;
    else
        return processors;
}

char *nativeLibPath() {
    return getenv("LD_LIBRARY_PATH");
}

void *nativeLibOpen(char *path) {
    return dlopen(path, RTLD_LAZY);
}

void nativeLibClose(void *handle) {
    dlclose(handle);
}

void *nativeLibSym(void *handle, char *symbol) {
    return dlsym(handle, symbol);
}

char *nativeLibMapName(char *name) {
   char *buff = sysMalloc(strlen(name) + sizeof("lib.so") + 1);

   sprintf(buff, "lib%s.so", name);
   return buff;
}