Greetings to everyone.
I wrote a script to calculate how much time is spent on the system
calls originating from a specific executable:
#!/usr/sbin/dtrace -s
/*
* Generate table statistics on how much time is spent on every system call,
* for a given program (its name is assigned to $1).
*/
#pragma D option quiet
syscall:::entry
/execname == $1/
{
self->sstart = timestamp;
}
syscall:::return
/execname == $1/
{
@timestats[probefunc] = avg(timestamp - self->sstart);
@cntstats[probefunc] = count();
self->sstart = 0;
}
tick-1sec
{
printf("%20s | %20s | %5s\n", "Function", "<ns> over 1-sec period",
"Count");
printa("%20s %...@d %...@d\n", @timestats, @cntstats);
printf("\n");
}
Here's the deal:
1. If I leave $1 without double quotes " and the execname I pass has a
dot in it, it (accidentally?) works ok:
$ pfexec ./temp.sh
...
In another terminal:
$ pfexec ./lala.d temp.sh
Function | <ns> over 1-sec period | Count
getgid 873 2
getuid 981 2
umask 1032 2
sysconfig 1077 9
getrlimit 1279 1
llseek 1290 4
gtime 1365 1
getpid 1437 25
2. If I leave $1 without double quotes " and the execname doesn't have
a dot in it, it fails with:
$ pfexec ./lala.d temp
dtrace: failed to compile script ./lala.d: line 11: failed to resolve
temp: Unknown variable name
3. If I surround $1 with double quotes, it fails not matter what the
supplied argument is:
$ pfexec ./lala.d temp.sh
dtrace: failed to compile script ./lala.d: line 31: extraneous
argument 'temp.sh' ($1 is not referenced)
$ pfexec ./lala.d temp
dtrace: failed to compile script ./lala.d: line 31: extraneous
argument 'temp' ($1 is not referenced)
I guess that I'm wrong in all 3 cases, but just being lucky in 1).
How could I pass an argument (possibly containing spaces) to dtrace
script and use that as a predicate for execname ?
Best regards,
Stathis
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