I'm rather a newbie so I hope I'm not missing something, but... aren't your
predicates commented out? I guess they should be "/ ... /" instead of "/* ...
*/".
--- Horacio
> On 08 Aug 2016, at 17:33, Bennett, Chip <cbenn...@ftdi.com> wrote:
>
> I used to do a lot of DTrace work, but it’s been a while, so I’m a little
> ashamed of having to ask this question, because I figure I’m probably missing
> something. J
>
> Why does the following script not exclude “<unknown>”:
>
> -bash-3.2# cat iosnoop.d
> #!/usr/sbin/dtrace -s
>
> #pragma D option quiet
>
> syscall::*write*:entry
> {
> self->start = 1;
> self->fd = arg0;
> }
>
> syscall::*write*:return
> /* self->start && arg0 > 0 && fds[self->fd].fi_pathname != "<unknown>" */
> {
> printf("%d %s\n", arg0, fds[self->fd].fi_pathname);
> }
>
> syscall::*write*:return
> /* self->start */
> {
> self->start = 0;
> self->fd = 0;
> }
> -bash-3.2# ./iosnoop.d | grep '<unknown>'
> 627 <unknown>
> 80 <unknown>
> 36 <unknown>
> 64 <unknown>
> 64 <unknown>
> 53 <unknown>
> ^C-bash-3.2#
>
> Thanks,
> Chip Bennett
>
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