c语言fork进程无需等待子进程

如何解决c语言fork进程无需等待子进程

我在c语言做fork练习的时候有个问题，很简单：

<!-- Block for the Calendar --> 
    <div class="calendar">
      <label>From Date</label>
      <input type="date" name="" max="" id="fromDate">
      <br><br>
      <label>To Date</label>
      <input type="date" name="" max="" id="toDate">
      <br><br>
      <button onclick="myFunction()">See Data</button>
    </div>

    <p id="selectedDate"></p>
    
    <!-- Block for Calendar to show error--> 
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
    <script type="text/javascript">
    var fromDate;
    $('#fromDate').on('change',function(){
    fromDate = $(this).val();
    $('#toDate').val(""); // RESET toDate when fromDate is changed
    $('#toDate').prop('min',function(){
      return fromDate;
    })
  });
</script>

<!-- Storing the Value of the fromDate and toDate --> 
<script>
  var dateDict = {
    "2021-04-01": 1,"2021-04-02": 1,"2021-04-03": 5,"2021-04-04": 1,"2021-04-05": 2
  };

  function myFunction() {
    var x = document.getElementById("fromDate").value;
    var y = document.getElementById("toDate").value;
    document.getElementById("selectedDate").innerHTML = x + y;
    console.log(fromDate in dateDict); // gives true if fromDate is in dateDict
    console.log(dateDict[fromDate]); // gives the value corresponding to the date
  }
</script>

输出不是我所期望的：

#include <stdio.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
// forkexec.c: fork then exec


int
main()
{
  int pid;

  pid = fork();
  if(pid == 0){
    char *argv[] = { "echo","THIS","IS","ECHO",0 };
    execvp("echo",argv);
    printf("exec failed!\n");
    exit(1);
  } else {
    printf("parent waiting\n");
    //wait(&status);
    //printf("the child exited with status %d\n",status);
  }

  exit(0);
}

怎么可能？似乎在 THIS IS ECHO 之后仍然等待用户输入，多么神奇的等待！它会导致程序无法正常运行！所以有人可以解释一下吗？谢谢