Step by Step solution about How to resolve the algorithm Fork step by step in the C programming language

The C code you provided is a simple example of how to use the fork() system call to create a new process. The fork() system call creates a child process that is an exact copy of the parent process. The child process has its own copy of the parent's memory space, but it has a different process ID (PID).

In the code you provided, the fork() system call is used to create a child process that runs the following code:

usleep(10000);
printf("\tchild process: done\n");

The usleep() function causes the child process to sleep for 10 milliseconds. The printf() function prints a message to the console.

Meanwhile, the parent process continues to run the following code:

printf("waiting for child %d...\n", (int)pid);
printf("child %d finished\n", (int)wait(0));

The printf() function prints a message to the console, indicating that the parent process is waiting for the child process to finish. The wait() function waits for the child process to finish and returns the PID of the child process.

The output of the program is as follows:

waiting for child 3604...
       child process: done
child 3604 finished

The output shows that the child process printed its message to the console after sleeping for 10 milliseconds. The parent process then printed its message to the console, indicating that it was waiting for the child process to finish. Finally, the parent process printed the PID of the child process, indicating that the child process had finished.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include <err.h>

int main()
{
	pid_t pid;

	if (!(pid = fork())) {
		usleep(10000);
		printf("\tchild process: done\n");
	} else if (pid < 0) {
		err(1, "fork error");
	} else {
		printf("waiting for child %d...\n", (int)pid);
		printf("child %d finished\n", (int)wait(0));
	}

	return 0;
}


waiting for child 3604...
        child process: done
child 3604 finished