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Make sure that we refresh the PID on read(2) and write(2) operations.

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This fixes the process portion of the bpf(4) stats if the peer forks
into the background after it's opened the descriptor.  This bug
results in the following behavior for netstat -B:

# netstat -B
  Pid  Netif  Flags      Recv      Drop     Match Sblen Hblen Command
netstat: kern.proc.pid failed: No such process
78023    em0 p--s--   2237404     43119   2237404 13986     0 ??????

MFC after:	1 week
This commit is contained in:
Christian S.J. Peron 2007-10-12 14:58:34 +00:00
parent 9195f2b323
commit 50ed6e0713
1 changed files with 2 additions and 0 deletions
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2
sys/net/bpf.c
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@ -488,6 +488,7 @@ bpfread(struct cdev *dev, struct uio *uio, int ioflag)
return (EINVAL);
BPFD_LOCK(d);
d->bd_pid = curthread->td_proc->p_pid;
if (d->bd_state == BPF_WAITING)
callout_stop(&d->bd_callout);
timed_out = (d->bd_state == BPF_TIMED_OUT);
@ -616,6 +617,7 @@ bpfwrite(struct cdev *dev, struct uio *uio, int ioflag)
struct sockaddr dst;
int error, hlen;
d->bd_pid = curthread->td_proc->p_pid;
if (d->bd_bif == NULL)
return (ENXIO);