7B) C program to create a child process and to read commands from the standard input and execute them. [VTU SS&OS]

Code:

	#include<stdio.h>
	#include<stdlib.h>
	#include<unistd.h>

	void main()
	{
	char command[20];
	int ch,pid=fork();

	if(pid==0)
	{
	printf("The child process: ");
	do
	{
	printf("Enter the command: ");
	scanf("%s",command);
	system(command);
	printf("Press 1 to continue\n Press 0 to exit\n");
	scanf("%d",&ch);
	}while(ch!=0);
	}
	else
	{
	wait();
	}
	}

view raw ssos7b.c hosted with ❤ by GitHub

Explanation:
This program creates a child process. In the child process, we keep on ask users, some commands to execute in the system using system() command.

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>

include all necessary header files for normal operation.

void main()
{
char command[20];
int ch,pid=fork();

main function. call fork() to create a child process.
if it returns 0, you are in child process, so ask user for commands and keep on executing until he wants.

if(pid==0)
{
printf("The child process: ");
do
{
printf("Enter the command: ");
scanf("%s",command);
system(command);
printf("Press 1 to continue\n Press 0 to exit\n");
scanf("%d",&ch);
}while(ch!=0);
}

same thing is done here. if pid==0, we are in child process. so, with do while loop, until choice=1, ask user for command, store it in a string. call that command in system using system() function. Also ask user whether to continue or not, continue the same steps until user presses 0.

else
{
wait();
}
} //of main()

wait() in parent process waits until child gets completed. Then terminates the program.

Author : Unknown

He is a simple passionate tech freak who himself is an engineering student at Canara Engineering college. He likes App Development, Web designing, Blogging, Youtubing, Debugging and also is a CodeGeek!

7B) C program to create a child process and to read commands from the standard input and execute them. [VTU SS&OS]

Author : Unknown

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