Communication between parent and child
- by Pierre
Hi every one !
I have a little problem. I have to code a simple C application that creat a process and his child (fork()) and I have to do an operation. Parent initialize the values and child calculate. I write this :
#include
#include
#include
#include
#include
typedef struct {
int op1;
char op;
int op2;
}Operation;
Operation *varOP;
void finalResult()
{
float result = 0;
if(varOP-op == '+') result = (varOP-op1 + varOP-op2);
if(varOP-op == '-') result = (varOP-op1 - varOP-op2);
if(varOP-op == '*') result = (varOP-op1 * varOP-op2);
if(varOP-op == '+') result = (varOP-op1 / varOP-op2);
printf("%f",result);
}
int main () {
int p;
varOP = (Operation *)malloc(sizeof(Operation));
p = fork();
if(p == 0) // If child
{
signal(SIGUSR1, finalResult );
pause();
}
if(p 0) // If parent
{
varOP-op = '+';
varOP-op1 = 2;
varOP-op2 = 3;
kill(p, SIGUSR1);
wait(NULL);
}
return 0;
}
But my child is never called. Is there something wrong with my code?
Thanks for your help !
