diffork.c

此源码是著名的教材BeginningLinux Programming中文名字叫Linux程序设计书中的源代码

#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>

int globVar = 5;

int main(void)
{
	pid_t  pid;
	int    var = 1, i;
	
	printf("fork is diffirent with vfrok \n");

	pid = fork();
	/*pid = vfork();*/
	switch(pid) {
		case 0:
			i = 3;
			while(i-- > 0)
			{
				printf("Child process is running\n");
				globVar++;
				var++;
				sleep(1);
			}
			printf("Child's globVar = %d,var = %d\n",globVar,var);
			break;
		case -1:
			perror("Process creation failed\n");
			exit(0);
		default:
			i = 5;
			while(i-- > 0)
			{
				printf("Parent process is running\n");
				globVar++;
				var++;		
				sleep(1);
			}
			printf("Parent's globVar = %d ,var = %d\n", globVar ,var);
			exit(0);
	}
}