pipe_rw.c

来自「进程间通信共享内存的应用」· C语言 代码 · 共 48 行

#include <unistd.h>
#include <sys/types.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main()
{
	int pipe_fd[2];
	pid_t pid;
	char buf_r[100];
	char* p_wbuf;
	int r_num;
	memset(buf_r, 0, sizeof(buf_r));

	if (pipe(pipe_fd)<0)
	{
    	printf("pipe create error\n");
	    return -1;
	}

	if((pid=fork())==0)
	{
		printf("\n");
		close(pipe_fd[1]);
		sleep(2);
		if ((r_num = read(pipe_fd[0], buf_r, 100)) > 0){
			printf("%d numbers read from the pipe is %s\n",r_num,buf_r);
		}	
		close(pipe_fd[0]);
		exit(0);
  	}
	else if (pid > 0)
	{
		close(pipe_fd[0]);
		if(write(pipe_fd[1], "Hello",5) != -1)
			printf("parent write1 success!\n");
		if(write(pipe_fd[1], " Pipe",5) != -1)
			printf("parent write2 success!\n");
		close(pipe_fd[1]);
		sleep(3);
		waitpid(pid, NULL, 0);
		exit(0);
	}
}