Making Child Process - Revision history

Arjun Suresh at 18:18, 31 July 2014

2014-07-31T18:18:42Z

Arjun Suresh at 18:17, 31 July 2014

2014-07-31T18:17:06Z

Arjun Suresh: Created page with " #include #include #include #include #include int main() { uns..."

2014-07-31T18:14:59Z

Created page with "<syntaxhighlight lang="C" name="banker_algorithm"> #include <unistd.h> #include <stdio.h> #include <sys/types.h> #include <signal.h> #include <sys/wait.h> int main() { uns..."

New page

<syntaxhighlight lang="C" name="banker_algorithm">

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

int main()
{
unsigned i, l = 0, j;
int status;
char name[100];
pid_t pid;
pid = fork();//child starts
if(pid == 0)//pid = 0 for child only
{
fgets(name, 100, stdin);
printf("Thank you\n");
kill(getppid(), 9);//kills the parent
return;// child finishes here
}
for(i = 0; i < 500000; i++)
for(j = 0; j < 10000; j++)
l++; // l is used so that compiler just won't remove the loop for optimization
if(waitpid(pid, &status, WNOHANG) == 0)//Child still running
{
kill(pid, 9);// kills the child

if(! printf("Failed\n"))
printf("l = %u",l);// for ensuring the code remains after optimization
}

}

</syntaxhighlight>

{{Template:FBD}}

[[Category:Operating System Codes]]

@@ Line 33: / Line 33: @@
 		kill(pid, 9);// kills the child
-	if(!	printf("Failed\n"))
+	        if(!printf("Failed\n"))
-	printf("l = %u",l);// for ensuring the code remains after optimization
+	                printf("l = %u",l);// for ensuring the code remains after optimization
+	}

@@ Line 1: / Line 1: @@
-<syntaxhighlight lang="C" name="banker_algorithm">
+The program should wait for a name to be entered by the user and then display "Thank you". If no input is given for 10s, the program should exit with output "Failed".
@@ Line 17: / Line 20: @@
 	if(pid == 0)//pid = 0 for child only
+	{
 		fgets(name, 100, stdin);
 		printf("Thank you\n");