Linux on-Machine notes (2)

Compile and run C + + under VI

VI 1.cpp (create CPP file name)

I (enter insert mode to start editing)

Enter completion code and press ESC to exit

Then press Shift +: Enter Wq (Save and exit)

g++ 1.cpp-o 1 (Compile the 1.cpp file, the compiled executable file name is 1)

./1 Running Results

System calls

The fork () system produces a new process each time it is called

Getpid () The system calls the process back to the PID of this process

Getppid () The system calls the process back to the PID of the parent process of this process

Wait () pauses the execution of this process until a child process ends-----can be used to implement a simple synchronization between the two processes. Order and speed are likely to run each time different.

Exit () Terminate this process