#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "err.h"
#define NR_PROC 5
// Wersja z rekurencją
void solve(int n) {
if (n == 1) {
printf("current:%d parent:%d\n", getpid
(), getppid
());
return;
}
pid_t pid = fork();
if (pid == -1) {
syserr("Error in fork\n");
}
else if (pid == 0) { // jeśli jest potomkiem
solve(n-1);
}
else { // jeśli jest rodzicem
if (wait(0) == -1) { // Czeka az potomek skonczy.
syserr("Error in wait\n");
}
printf("current:%d parent:%d\n", getpid
(), getppid
());
}
}
int main ()
{
// solve(NR_PROC);
pid_t pid;
int i;
/* Wersja w pętli */
for (i = 1; i <= NR_PROC; i++) {
if (i == NR_PROC) {
printf("current:%d parent:%d\n", getpid
(), getppid
());
return 0;
}
switch (pid = fork()) {
case -1:
syserr("Error in fork\n");
case 0: /* proces potomny */
continue;
default: /* proces macierzysty */
{
if (wait(0) == -1) { // Czeka az potomek skonczy.
syserr("Error in wait\n");
}
printf("current:%d parent:%d\n", getpid
(), getppid
());
return 0;
}
}
}
return 0;
}
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