#include "timeoutread.h"#include "select.h"#include "error.h"#include "readwrite.h"int timeoutread(t,fd,buf,len) int t; int fd; char *buf; int len;{  fd_set rfds;  struct timeval tv;  tv.tv_sec = t;  tv.tv_usec = 0;  FD_ZERO(&rfds);  FD_SET(fd,&rfds);  if (select(fd + 1,&rfds,(fd_set *) 0,(fd_set *) 0,&tv) == -1) return -1;  if (FD_ISSET(fd,&rfds)) return read(fd,buf,len);  errno = error_timeout;  return -1;}