即使我正在调用waitpid，我的程序也停滞了，因此父级无法完成

Question

我的程序旨在从文件读取数据，但我只是希望它使用管道将整数返回给父级。但是，当我运行它时，进程永远无法达到从子级读取或写入数据的目的。任何提示或解决方案将不胜感激。最具体地讲，如何使用持有每个孩子ID的pid数组将孩子的数据返回给父母？

#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>

int main(int argc, char** argv){

  int sum, i, numOfChildren, fileSize;

  struct stat st;
  char *filename, c;
  FILE *fp;

  //check num of arguments
  if(argc != 3){
         perror("Usage: pSum filename numberOfChildren");
         return 1;
  }

  filename = argv[1];
  numOfChildren = atoi(argv[2]);

  // open file to read size
  if(stat(filename, &st)== 0){
         fileSize = st.st_size;
  }
  else{
          perror("File could not be opened");
          return 1;
  }

  // calculate file size and partitions
  int partition = fileSize/numOfChildren;
  int fd[numOfChildren][2];

  pid_t childProc[numOfChildren];

  for(i = 0; i < numOfChildren; i++){
    int childCount;
    //calculate offset and how far to read

    //open pipe and fork
    pipe(fd[i]);
    childProc[i] = fork();

    // child work
    if(childProc[i] == 0){
      // close write side of pipe
      close(fd[i][1]);

      // open file and set position
      fp = fopen(filename, "r");
      if(fp == NULL){
        perror("file unable to be opened");
        return 1;
      }
      // read data from file, sum, and pipe to parent
   /* while((c=fgetc(fp)) != EOF){
        printf("%c", c);
      } */
      childCount = 5;

      write(fd[i][1], &childCount,sizeof(childCount));
      // close pipe and file
      // close reading end of pipe
      close(fd[i][0]);
      fclose(fp);

      // return sum
      return childCount;
    }
  }

  //close read pipe and modify file variables


  // get values from children and sum them
  sum = 0;
  int status;
  pid_t pid;
  printf("number of partitions %d\n", partition);
  sleep(5);
  for(i = 0; i < numOfChildren; i++){
    waitpid(childProc[i],&status,0);
    printf("child %d is being read", i);
    read(fd[i][0], &status, sizeof(int));
    close(fd[i][0]);
    sum = sum + status;
  }

  // print results
  printf("The total sum of the file is %d\n", sum);

  return 0;
}