03 客户端命令 devctl monitor¶

特性描述¶

监听内核和用户态的uevent事件

特性约束¶

无

子场景 1¶

测试devctl monitor是否可以正常监听uevent事件

备注¶

无

准备工作¶

创建loop设备

# dd if=/dev/zero of=loop.img bs=1M count=100
# loopnum=$(losetup -f)
# losetup  $loopnum loop.img
# mkfs.ext4 $loopnum

测试步骤¶

触发事件

# udevadm trigger --action=[add/remove/change/move/online/offline/bind/unbind]

新开窗口执行查看devctl monitor是否有对应事件消息打印

结果验证¶

devctl monitor可以监听到对应事件

KERNEL [] >> remove /devices/virtual/block/loop0 (block)
2023-08-13 19:32:39 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> add /devices/virtual/block/loop0 (block)
2023-08-13 19:32:49 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> change /devices/virtual/block/loop0 (block)
2023-08-13 19:32:59 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> move /devices/virtual/block/loop0 (block)
2023-08-13 19:33:14 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> offline /devices/virtual/block/loop0 (block)
2023-08-13 19:33:21 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> online /devices/virtual/block/loop0 (block)
2023-08-13 19:33:27 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> unbind /devices/virtual/block/loop0 (block)
2023-08-13 19:33:34 devctl::subcmds::devctl_monitor Device error: origin from udev
KERNEL [] >> bind /devices/virtual/block/loop0 (block)
2023-08-13 19:33:37 devctl::subcmds::devctl_monitor Device error: origin from udev

测试结束¶

# losetup -d $loopnum
# rm -rf loop.img

测试场景约束¶

无

Last update: August 23, 2023
Created: August 23, 2023