4．實(shí)驗(yàn)結(jié)果

首先在虛擬設(shè)備驅(qū)動(dòng)源碼目錄下編譯并加載驅(qū)動(dòng)模塊。

$makeclean;make

$./test_drv_load

接下來，編譯并運(yùn)行測試程序

$gcc–otesttest.c

$./test

測試程序運(yùn)行效果如下：

Inputsomewordstokernel(enter'quit'toexit):Hello,everybody!

Thereadstringisfromkernel:Hello,everybody!/*從內(nèi)核讀取的數(shù)據(jù)*/

Inputsomewordstokernel(enter'quit'toexit):Thisisasimpledriver

Thereadstringisfromkernel:Thisisasimpledriver

Inputsomewordstokernel(enter'quit'toexit):quit

Thereadstringisfromkernel:quit

最后，卸載驅(qū)動(dòng)程序

$./test_drv_unload

通過dmesg命令可以查看內(nèi)核打印的信息：

$dmesg|tail–n10

……

Themajorofthetestdeviceis250/*當(dāng)加載模塊時(shí)打印*/

Thisisopenoperation/*當(dāng)打開設(shè)備時(shí)打印*/

Thisisreleaseoperation/*關(guān)閉設(shè)備時(shí)打印*/

Testdeviceuninstalled/*當(dāng)卸載設(shè)備時(shí)打印*/