On Mon, 24 Jan 2000, Yevmenkin, Maksim N, CSCIO wrote:
> All,
>
> I've just found that read from /dev/bpfX never return EAGAIN/EWOULDBLOCK.
> It means that when you do a non blocking read and there is no data you will
> always get 0.
>
> Does it suppose work this way?
I think it is a bug. Perhaps applications depend on it.
Untested fix:
diff -c2 bpf.c~ bpf.c
*** bpf.c~ Sun Jan 16 15:50:59 2000
--- bpf.c Tue Jan 25 23:44:32 2000
***************
*** 502,506 ****
if (d->bd_slen == 0) {
splx(s);
! return (0);
}
ROTATE_BUFFERS(d);
--- 504,508 ----
if (d->bd_slen == 0) {
splx(s);
! return (EWOULDBLOCK);
}
ROTATE_BUFFERS(d);
Bruce
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