pipe_sample.c

linux下有命管道和无名管道的使用。以及管道读写规则

#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>

void sig_handle(int signum)
{
	printf("signal number is %d\n",signum);
}

int main(int argc,char *argv[])
{
	int fd[2];
	pid_t child;
	char buffer[6000];
	char r_buffer[6000];
	int write_count=0;
	int read_count=0;
	if (pipe(fd)==-1)
	{
		//perror("pipe:");
		printf("error!\n");
		return -1;
	}
	strcpy(buffer,"this pipe sample!");
	signal(SIGPIPE,sig_handle);
	child=fork();
	if (child==0)
	{
		close(fd[1]);
		sleep(5);
		printf("ready read data!\n");
		read_count=read(fd[0],r_buffer,sizeof(r_buffer));		
		
		//close(fd[0]);
		/*sleep(5);
		read_count=read(fd[0],r_buffer,sizeof(r_buffer));
		printf("%s",r_buffer);
		close(fd[0]);
		*/
		exit(1);
			
	}
	else if (child>0)
	{
		sleep(2);
		close(fd[0]);
		fcntl(fd[1],F_SETFL,O_NONBLOCK);
		write_count=write(fd[1],buffer,sizeof(buffer));
		close(fd[1]);
		//sleep(2);
	}
	printf("you writed %d byte\n",write_count);
	return 0;
	
}