Is the library loaded by dlopen replaceable?

[linuxlin365]

I want to hook XSetSelectionOwner,libx11.so is loaded dlopen.
What should I do?

1. ProcessA

        HANDLE hOneSo = dlopen("libOneSo.so", RTLD_LAZY);
        if (hOneSo == NULL)
        {
            printf("Test:: dlopen Failed.\n");
            return 1;
        }

        typedef void (*PFN_OneSo)();
        PFN_OneSo pOneSo = (PFN_OneSo)dlsym(hOneSo, "OneSo");
        if (pOneSo == NULL)
        {
            printf("Test:: dlsym failed.Err:%d\n", errno);
            return 1;
        }

        pOneSo();
        dlclose(hOneSo);

$ ldd Test.bin 
	linux-vdso.so.1 (0x00007fffd7dd7000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f30952db000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f30952b8000)
	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f3095087000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f309506a000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f3094e78000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f3095424000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3094b0c000)

2. libOneSo.so

void OneSo()
{
    Display * display = XOpenDisplay(":0");
    if (display == NULL)
    {
        printf("OneSo:: Open Display Failed.\n");
        return;
    }
    int rlt = XSetSelectionOwner(display,1,1,1);
    printf("OneSo:: XSetSelectionOwner Rlt:%d\n",rlt);

}

$ ldd libOneSo.so 
	linux-vdso.so.1 (0x00007fffac99f000)
	libX11.so.6 => /lib/x86_64-linux-gnu/libX11.so.6 (0x00007f599b5d1000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f599b3df000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f599b3d9000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f599b3b6000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f599b84d000)
	libxcb.so.1 => /lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f599b38a000)
	libXau.so.6 => /lib/x86_64-linux-gnu/libXau.so.6 (0x00007f599b384000)
	libXdmcp.so.6 => /lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f599b37c000)
	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f599b362000)