dtrace discuss - Apr 2007 - n00b question

... so be kind.  I''m just getting into dtrace.

In that context, I picked up this script from the short HOWTO on sun.com:

#!/usr/sbin/dtrace -s

proc:::signal-send
{
        printf("%d was sent to %s by ", args[2],
args[1]->pr_fname);
        system("getent passwd %d | cut -d: -f5", uid);
}

When executed on my u40 running s10u3, I get this result:

42 # ./allsignals.d
dtrace: script ''./allsignals.d'' matched 1 probe
dtrace: could not enable tracing: Destructive actions not allowed
43 #

which is not the expected result according to the howto.

It would appear to be some kind of permissions problem, but

43 # id
uid=0(root) gid=0(root)

So basically there''s just something I don''t understand (and
potentially a bug in the howto doc.)

Thanks

Charlie Martin
-- 
Laissez-nous faire, laissez-nous passer.
Le monde va de lui-m?me.

Charles Martin writes:
> #!/usr/sbin/dtrace -s
Change that to "-ws".

system() is considered a "destructive action" and requires the
"-w"
flag to enable.

-- 
James Carlson, Solaris Networking              <james.d.carlson at
sun.com>
Sun Microsystems / 1 Network Drive         71.232W   Vox +1 781 442 2084
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