(to be continued) Process Control (iv)---replication between parent and child processes

User buffers: child processes created by the fork function inherit the user buffer of the parent process. If there is still data in the buffer before the parent process calls the fork function to create the child process, the child process will copy the buffer of the parent process. file sharing : child processes created by the fork function inherit all file descriptors opened by the parent process, and the same file descriptor for the parent-child process refers to the same file table entry (sharing a read-write offset pointer). The Nameless pipe in IPC (interprocess communication) is implemented by using the character of a child process that inherits the file descriptor of the parent process.

(to be continued) Process Control (iv)---replication between parent and child processes