What is supposed to happen when a user-process does the following?
int n_ready;
fd_set rfds;
/* assume fd is an already-opened /dev/rtf */
ioctl(fd, FIONREAD, &n_ready);
if (n_ready == 0) {
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
select (fd+1, &rfds, NULL, NULL, NULL); /* block indefinitely waiting
for new stuff on fd */
}
Basically the above code snippet blocks forever whenever the ioctl
detects 0 bytes ready for reading.. even though I *know* my real-time thread
is generating more data on the fifo...
Is this a bug/lacking feature of /dev/rtf or a simple stupid thing i am
overlooking? I guess I can open up the rtl_fifo.c file and have a gander
at it myself.... but maybe one of you can save me the trouble.. thanks!
And I know.. I could just open the fifo with blocking reads, but I
wanted to see if I could selectively block and not block on demand using
select()...
-Calin
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