1>

源代码：

#include <myhead.h>

int main(int argc, const char *argv[])
{
	pid_t pid = -1;
	FILE *src = NULL;
	FILE *dest = NULL;
	if ((src = fopen("./base.txt", "r")) == NULL)
	{
		perror("fopen error");
		return -1;
	}
	fseek(src, 0, SEEK_END);
	fseek(src, 0, SEEK_SET);

	char buf1[64] = "";
	char buf2[64] = "";
	int size = ftell(src);
	//创建一个子进程
	pid = fork();

	//判断父子进程执行的程序代码
	if (pid > 0)
	{

		int i = 0;
		printf("我是父进程，当前进程id号：%d,ppid=%d, childid=%d\n", getpid(),
			   getppid(), pid);

		if ((dest = fopen("./aim1.txt", "w")) == NULL)
		{
			perror("fopen error");
			return -1;
		}
		while ((fgets(buf1, sizeof(buf1) - 1, src)) != NULL && i++ <= size / 2)
		{
			fputs(buf1, dest);
		}
	}
	else
	{
		int j = size / 2;
		fseek(dest,size/2,SEEK_END);
		printf("我是子进程当前进程id号：%d,ppid = %d\n", getpid(), getppid());

		if ((dest = fopen("./aim2.txt", "w")) == NULL)
		{
			perror("fopen error");
			return -1;
		}
		fseek(src, size / 2, SEEK_SET);
		while ((fgets(buf2, sizeof(buf2) - 1, src)) != NULL && j++ <= size)
		{
			fputs(buf2, dest);
		}
	}

	wait(NULL); //阻塞等待子进程结束
	printf("已经成功回收子进程\n");
	fclose(src);
	fclose(dest);

	return 0;
}

效果图：

2>思维导图