Give the output for the following code. (Recall the wait () function pauses unti

Question

Give the output for the following code. (Recall the wait () function pauses until any child process has completed. If a process does not have a child the function returns immediately.) With the wait (NULL) line commented out: With the wait (NULL) line not commented out: int main(void) {int i = 5, pid; printf("1:%d ", i); pid = fork(); i++; printf("2:%d ", i);//wait(NULL); if (pid == 0) {sleep(1); i--; printf("3:%d ", i); sleep(1); i += 4; printf("4:%d M, i);} else {i++; printf("5:%d ", i); i = i+3; printf("6:%d ", i); sleep (6); i = 0; printf("7:%d ", i);} i += 2; printf("8:%d ", i);

Explanation / Answer

a) With the wait(NULL) line commented out:

Program:

#include <stdio.h>

int main(void)
{
int i=5,pid;
printf("1:%d ",i);
pid=fork();
i++;
printf("2:%d ",i);
//wait(NULL);
if(pid==0)
{
sleep(1);
i--;
printf("3:%d ",i);
sleep(1);
i+=4;
printf("4:%d ",i);
}
else
{
i++;
printf("5:%d ",i);
i=i+3;
printf("6:%d ",i);
sleep(6);
i=0;
printf("7:%d ",i);
}
i+=2;
printf("8:%d ",i);
}

Output:

1:5
2:6
3:5
4:9
8:11
1:5
2:6
5:7
6:10
7:0
8:2

b) With the wait(NULL) line not commented out:

Program:

int main(void)
{
int i=5,pid;
printf("1:%d ",i);
pid=fork();
i++;
printf("2:%d ",i);
wait(NULL);
if(pid==0)
{
sleep(1);
i--;
printf("3:%d ",i);
sleep(1);
i+=4;
printf("4:%d ",i);
}
else
{
i++;
printf("5:%d ",i);
i=i+3;
printf("6:%d ",i);
sleep(6);
i=0;
printf("7:%d ",i);
}
i+=2;
printf("8:%d ",i);
}

Output:

1:5
2:6
3:5
4:9
8:11
1:5
2:6
5:7
6:10
7:0
8:2

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