read(STDIN_FILENO,buf,BUFFSIZE)

#include <apue.h>
#include <myerr.h>
#define BUFFSIZE 4096
int main( int argc, char *argv[] )
{
	int n;
	char buf[BUFFSIZE];
	while((n=read(STDIN_FILENO,buf,BUFFSIZE))>0)
		if(write(STDOUT_FILENO,buf,n)!=n)
		   err_sys("write error");
	if(n<0)
	      err_sys("read error");
	
	return 0;
}