In Linux, if you can see the device node, it means that the device can be accessed

The device node represents each computer hardware, and the software wants to use that hardware, and it will open the device node. . . dev ttys0 This is serial port 0, which is com1 in windows, and only programs that use serial port 0 will open this device node. Personal humble opinion, for reference only, hope in time.

It is an external port used to connect to the system in Linux. For example, mounting optical drives, floppy drives, or hard disks, file devices, etc.

The reason why you sometimes don't need to create the node yourself is because there is a program that creates it automatically.

class create and device create, the specific usage is very simple, you can check it yourself.

Also, mknod is used at the beginning of learning, do you want to write drivers in the future to manually hail to establish a source faction to report the node?

1 ps -fe|grep filename, you can also use fuser filename to view.

Just look at that process: ps -ef |grep 11345 to see the files opened by the process: lsof -p 11345 to see memory allocation:

LCAT Proc 11345 Maps View Stack: Pstack 11345

Check the system call that was made: strace -p 11345 View the call library function: ltrace -p 1134511345 is the process number.

Access through a file means that the device is used as a special file for reading and writing operations.

In Linux-based systems, the following prefix is usually used when the standby node is set under dev: fb:frame buffer fd:

Floppy HDD HDD LP: Printer Shed Beam PA:

And the stove pt: pseudo-terminal s: scsi device scd:

SCSI Audio Drive SD: SCSI Hard Disk.

It may affect the data, in addition, If there is data, It is recommended to operate carefully, can you take a look at the name of the mynet? This problem can help you solve it.