Date: Tue, 10 Dec 2013 15:59:38 -0800 From: hiren panchasara <hiren.panchasara@gmail.com> To: David Wolfskill <david@catwhisker.org> Cc: freebsd-dtrace@freebsd.org Subject: Re: Examples from www.dtracebook.com Message-ID: <CALCpEUGms0S%2BQue%2B6TmAZmRW4t8LZh02r-q%2Bvf1WupDkwcpH-Q@mail.gmail.com> In-Reply-To: <20131210234714.GQ1681@albert.catwhisker.org> References: <CALCpEUFnwN%2BmwTDyq-_q3x8jkk8EBfzMMyRzVeHDrHq=j-nqVg@mail.gmail.com> <20131210234714.GQ1681@albert.catwhisker.org>
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On Tue, Dec 10, 2013 at 3:47 PM, David Wolfskill <david@catwhisker.org> wrote: > On Tue, Dec 10, 2013 at 03:43:16PM -0800, hiren panchasara wrote: >> http://www.dtracebook.com/index.php/Introduction_to_DTrace:read-syscall.d >> >> $ sudo dtrace -n 'syscall::read:entry /execname != "dtrace"/ { >> @reads[execname, fds[arg0].fi_pathname] = count(); }' >> dtrace: invalid probe specifier syscall::read:entry /execname != >> "dtrace"/ { @reads[execname, fds[arg0].fi_pathname] = count(); }: in >> action list: fds has not yet been declared or assigned >> >> This is on FreeBSD -head. >> >> >> $ sudo dtrace -l | grep " read entry" >> 49341 syscall freebsd32 read entry >> 50413 syscall freebsd read entry >> >> What am I missing? What does "invalid probe specifier " mean here? >> .... > > Exactly what the message says: "fds has not yet been declared or > assigned". We don't presently have the fds array -- see p. 131 of the > book. Ah, thanks David :-) $ sudo dtrace -n 'syscall::read:entry /execname != "dtrace"/ { @reads[execname] = count(); }' dtrace: description 'syscall::read:entry ' matched 2 probes ^C devd 1 stty 2 sendmail 7 top 10 bash 54 sshd 297 grep 5856 First column is proc name and second one is number of read(2) calls. cheers, Hiren ps: I will keep posting here as I find something that I do not understand.
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