JZTXT

父子进程

发布时间 2023-07-06 22:38:40作者: hacker_dvd
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>

// 父子进程遵循读时共享，写时复制的原则
int var = 100;
int main() {
  pid_t pid;
  pid = fork();
  if (pid == -1) {
    perror("fork error");
    exit(1);
  } else if (pid > 0) {
    var = 200;
    printf("parent, var = %d\n", var);
  } else if (pid == 0) {
    // var = 300;
    printf("child, var = %d\n", var);
  }

  return 0;
}