实例9-7.c

Linux下C语言编程例子

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#define FIFO_SERVER "/tmp/fifoserver"

main(int argc,char** argv)
{
	char r_buf[4096*2];
	int  fd;
	int  r_size;
	int  ret_size;
	r_size=atoi(argv[1]);
	printf("requred real read bytes %d\n",r_size);
	memset(r_buf,0,sizeof(r_buf));
	fd=open(FIFO_SERVER,O_RDONLY|O_NONBLOCK,0);
	/*fd=open(FIFO_SERVER,O_RDONLY,0);
	在此处可以把读程序编译成两个不同版本：阻塞版本及非阻塞版本*/
	if(fd==-1)
	{
		printf("open %s for read error\n");
		exit();	
	}
	while(1)
	{
		
		memset(r_buf,0,sizeof(r_buf));
		ret_size=read(fd,r_buf,r_size);
		if(ret_size==-1)
			if(errno==EAGAIN)
				printf("no data avlaible\n");
		printf("real read bytes %d\n",ret_size);
		sleep(1);
	}	
	pause();
	unlink(FIFO_SERVER);
}