我有一个带有两个侧面按钮的鼠标。
xev我已经发布了两个按钮的输出evtest：
西夫
EnterNotify event, serial 37, synthetic NO, window 0x4600001,
root 0x306, subw 0x0, time 5663259, (11,69), root:(799,121),
mode NotifyNormal, detail NotifyInferior, same_screen YES,
focus YES, state 0
KeymapNotify event, serial 37, synthetic NO, window 0x0,
keys: 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
---------------------------------------------------------------------------
---------------------------------------------------------------------------
EnterNotify event, serial 37, synthetic NO, window 0x4600001,
root 0x306, subw 0x4600002, time 5662311, (30,60), root:(818,112),
mode NotifyUngrab, detail NotifyVirtual, same_screen YES,
focus YES, state 0
KeymapNotify event, serial 37, synthetic NO, window 0x0,
keys: 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
测试：
Event: time 1420063746.029705, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90005
Event: time 1420063746.029705, type 1 (EV_KEY), code 276 (BTN_EXTRA), value 1
Event: time 1420063746.029705, -------------- SYN_REPORT ------------
Event: time 1420063746.165669, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90005
Event: time 1420063746.165669, type 1 (EV_KEY), code 276 (BTN_EXTRA), value 0
------------------------------------------------------------------------------
------------------------------------------------------------------------------
Event: time 1420063746.165669, -------------- SYN_REPORT ------------
Event: time 1420063747.373693, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90004
Event: time 1420063747.373693, type 1 (EV_KEY), code 275 (BTN_SIDE), value 1
Event: time 1420063747.373693, -------------- SYN_REPORT ------------
Event: time 1420063747.533689, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90004
Event: time 1420063747.533689, type 1 (EV_KEY), code 275 (BTN_SIDE), value 0
如何将这些按钮映射到某些虚拟键？例如，如何将这些按钮映射为back和forward？