Difference between revisions of "Making Child Process"

Revision as of 18:17, 31 July 2014

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".

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 {

               printf("Enter name: ");

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>

@@ 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".
+<syntaxhighlight lang="C" name="fork">
@@ Line 17: / Line 20: @@
  if(pid == 0)//pid = 0 for child only
  {
+                printf("Enter name: ");
  fgets(name, 100, stdin);
  printf("Thank you\n");