Подсчет процессов в поддереве

#include <stddef.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <dirent.h>
 
int count = 1;
 
int numberCount(FILE* input) {
  fseek(input, 0, SEEK_SET);
  int counter = 0;
  while (true) 
  {
    int value;
    if (fscanf(input, "%d", &value) == 1)
      counter++;
    if (feof(input))
      break;
  }
  return counter;
}
 
void read_numbers(FILE* input, int size, int* numbers) {
  fseek(input, 0, SEEK_SET);
  int i = 0;
  while (i < size)
  {
    fscanf(input, "%d", &numbers[i]);
    i++;
  }
}
 
void getppid(int proc_pid, int pid_for_diff) {
    char buf[255];
    sprintf(buf, "/proc/%d/task/%d/children", proc_pid);
    FILE* fd = fopen(buf, "r");
    int size = numberCount(fd);
    int* pids = (int*)malloc(sizeof(int) * size);
    read_numbers(fd, size, pids);
    fclose(fd);
    int i = 0;
    while(i < size)
    {
        if (pid_for_diff == pids[i])
        {
            count++;
            getppid(pids[i], pid_for_diff);
        }
        i++;
    }   
}
 
int main(int argc, char *argv[]) {   
    int pid = atoi(argv[1]);
    getppid(pid, pid);
    printf("%d\n", count);
    return 0;
}