static int pipe_poll(struct fnode *f, uint16_t events, uint16_t *revents)
{
struct pipe_priv *pp;
*revents = 0;
if (f->owner != &mod_pipe)
return -EINVAL;
pp = (struct pipe_priv *)f->priv;
if (!pp) {
return -EINVAL;
}
if (f == pp->fno_w) {
if(pp->fno_r == 0) {
*revents |= POLLHUP;
return 1;
}
else if ((events & POLLOUT) && (cirbuf_bytesfree(pp->cb) > 0)) {
*revents = POLLOUT;
return 1;
}
}
if ((f == pp->fno_r) && (events & POLLIN) && (cirbuf_bytesinuse(pp->cb) > 0)) {
*revents |= POLLIN;
return 1;
}
return 0;
}
static int pipe_read(struct fnode *f, void *buf, unsigned int len)
{
struct pipe_priv *pp;
int out, len_available;
uint8_t *ptr = buf;
if (f->owner != &mod_pipe)
return -EINVAL;
pp = (struct pipe_priv *)f->priv;
if (!pp)
return -EINVAL;
if (pp->fno_r != f)
return -EPERM;
len_available = cirbuf_bytesinuse(pp->cb);
if (len_available <= 0) {
pp->pid_r = scheduler_get_cur_pid();
task_suspend();
return SYS_CALL_AGAIN;
}
for(out = 0; out < len; out++) {
/* read data */
if (cirbuf_readbyte(pp->cb, ptr) != 0)
break;
ptr++;
}
pp->pid_r = 0;
return out;
}
static int klog_poll(struct fnode *fno, uint16_t events, uint16_t *revents)
{
if (events != POLLIN)
return 0;
if (cirbuf_bytesinuse(klog.buf) > 0) {
*revents = POLLIN;
return 1;
}
return 0;
}
