/* wait for any activity on the specified file descriptor using
the specified deadline */
static int tio_wait(int fd, short events, int timeout,
struct timespec *deadline)
{
int t;
struct pollfd fds[1];
int rv;
while (1)
{
fds[0].fd = fd;
fds[0].events = events;
/* figure out the time we need to wait */
if ((t = tio_time_remaining(deadline, timeout)) < 0)
{
errno = ETIME;
return -1;
}
/* sanitiy check for moving clock */
if (t > timeout)
t = timeout;
/* wait for activity */
rv = poll(fds, 1, t);
if (rv > 0)
return 0; /* we have activity */
else if (rv == 0)
{
/* no file descriptors were available within the specified time */
errno = ETIME;
return -1;
}
else if ((errno != EINTR) && (errno != EAGAIN))
/* some error ocurred */
return -1;
/* we just try again on EINTR or EAGAIN */
}
}
/* wait for any activity on the specified file descriptor using
the specified deadline */
static int tio_wait(TFILE *fp,int readfd,const struct timeval *deadline)
{
int timeout;
struct pollfd fds[1];
int rv;
while (1)
{
/* figure out the time we need to wait */
if ((timeout=tio_time_remaining(deadline))<0)
{
errno=ETIME;
return -1;
}
/* wait for activity */
if (readfd)
{
fds[0].fd=fp->fd;
fds[0].events=POLLIN;
/* santiy check for moving clock */
if (timeout>fp->readtimeout)
timeout=fp->readtimeout;
}
else
{
fds[0].fd=fp->fd;
fds[0].events=POLLOUT;
/* santiy check for moving clock */
if (timeout>fp->writetimeout)
timeout=fp->writetimeout;
}
rv=poll(fds,1,timeout);
if (rv>0)
return 0; /* we have activity */
else if (rv==0)
{
/* no file descriptors were available within the specified time */
errno=ETIME;
return -1;
}
else if (errno!=EINTR)
/* some error ocurred */
return -1;
/* we just try again on EINTR */
}
}
