openwrt kernel test

rootfs_test.c

//static int __init populate_rootfs(void)

        {/* Just test hear */
            int fd, cnt;
            char* buf = NULL;
            fd = sys_open("/etc/preinit", O_RDONLY, 0);
	    buf = (char*)kmalloc(1024, GFP_KERNEL);
            cnt = sys_read(fd, buf, 1024);

            if(cnt == 1024)
                cnt = 1023;

            if(cnt > 0)
            {
                buf[cnt+1] = '\0';
                printk("%s#%d: unpack ok, buf=%s\n", __FUNCTION__, __LINE__, buf);
            }
            else
            {
                printk("%s#%d: unpack error\n", __FUNCTION__, __LINE__);
            }
            sys_close(fd);
        }

//main.c
static void run_init_process(const char *init_filename)
{
        int i = 2;
	argv_init[0] = init_filename;
        envp_init[i++] = "LD_TRACE_LOADED_OBJECTS=1";
        envp_init[i++] = "LD_TRACE_PRELINKING=1";
        envp_init[i++] = "LD_WARN=";
        envp_init[i++] = NULL;
	kernel_execve(init_filename, argv_init, envp_init);
}