管道的应用

Posted 2022-12-09 吾乃世间奇才

#include<string.h>
#include<stdlib.h>
#include<errno.h>
#include<assert.h>
#include<stdio.h>
#include<sys/wait.h>
#include<sys/types.h>
#include<unistd.h>
 
#define BUFFER_SIZE (32)
int main()
    int fd[2]=0,0;
	pid_t child_pid;
    int pipe_ret=pipe(fd);
    if(pipe_ret) 
		printf("error pipe\\n");
	child_pid=fork();
    if(child_pid < 0) 
		printf("error fork\\n");
	 else if (child_pid==0)
	        //child
	        close(fd[0]);
	        char child_buffer[BUFFER_SIZE];
			sprintf(child_buffer, "%s", "Hello World!");
			write(fd[1],child_buffer, strlen(child_buffer) + 1);

			sleep(1);

			sprintf(child_buffer, "%s", "Linux Programming");
			write(fd[1],child_buffer, strlen(child_buffer) + 1);
        	close(fd[1]);
     else
        //father
        close(fd[1]);
		int i;
        char father_buffer[BUFFER_SIZE];
        ssize_t read_size;
		for(i=0; i < 2; i++) 
			memset(father_buffer, 0, sizeof(father_buffer));
			read_size=read(fd[0],father_buffer,BUFFER_SIZE-1);
			printf("%s The length should be %ld.\\n", father_buffer, strlen(father_buffer));
        
        close(fd[0]);
	
    return 0;