C++ classes: 02 侯捷 - C++ Startup 揭密：C++ 程序的生前和死后

侯捷 - C++ Startup 揭密：C++ 程序的生前和死后. Also, see reference1

1. 前言，如何自定 Startup code

• Bibliography
  • 《程序员的自我修养——链接、装载与库》，俞甲子/石凡/潘爱民 著，电子工业出版社
    • 侧重Linux
• 自定Startup code(Entry-Point Symbol)

  • windows (use VC 6.0)

    #include <windows.h>
    int MyStartup(void)
    {
        int a = 10;
        HANDLE crtHeap = HeapCreate(HEAP_NO_SERIALIZE, 0x010, 4000 * 1024);
        int *p = (int *)HeapAlloc(crtHeap, HEAP_ZERO_MEMORY, 0x010);
        int i, j;
        for (i = 0; i < 100; i++)
        {
            // int j;
            for (j = 0; j < 100; j++, p++)
            {
                *p = i * 100 + (j + 1);
            }
        }
    
        MessageBoxA(NULL, p, "abcd", MB_OK);
        return 0;
    }
    

  • Linux (compile with $ gcc entrypoint.c -e blabla, then blabla will be called instead of main)

    #include <stdio.h>
    
    int blabla()
    {
        printf("Yes it works!\n");
        exit(0);
    }
    
    int main()
    {
        printf("not called!\n");
    }