Skip site navigation (1)Skip section navigation (2) 
Date:      Tue, 30 Aug 2022 17:49:21 +0200
From:      Mateusz Piotrowski <0mp@FreeBSD.org>
To:        freebsd-dtrace@freebsd.org
Subject:   Converting int to a string in DTrace
Message-ID:  <317C65CC-5BF0-422D-80E9-4340CD241569@FreeBSD.org>
index | next in thread | raw e-mail 

[-- Attachment #1 --]
Hello everyone,

Is it possible to convert an int to a string in DTrace?

E.g., I'd like the following script to work (it's an example from dtrace_io(4), but with device unit number added):

#!/usr/sbin/dtrace -s

#pragma D option quiet

io:::start
{
        this->unit_number = args[1]->unit_number >= 0 ? (string)args[1]->unit_number : "";
        @[args[1]->device_name, this->unit_number, execname, pid] = sum(args[0]->bio_bcount);
}

END
{
        printf("%10s%-3s %20s %10s %15s\n", "DEVICE", "", "APP", "PID", "BYTES");
        printa("%10s%-3s %20s %10d %15@d\n", @);
}

(Of course, the `(string)` cast does not work here because it's just not how DTrace works.)

Best,
Mateusz
[-- Attachment #2 --]
<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hello everyone,<div class=""><br class=""></div><div class="">Is it possible to convert an int to a string in DTrace?</div><div class=""><br class=""></div><div class="">E.g., I'd like the following script to work (it's an example from dtrace_io(4), but with device unit number added):</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><div class="">#!/usr/sbin/dtrace -s</div></div><div class=""><div class=""><br class=""></div></div><div class=""><div class="">#pragma D option quiet</div></div><div class=""><div class=""><br class=""></div></div><div class=""><div class="">io:::start</div></div><div class=""><div class="">{</div></div><div class=""><div class="">&nbsp; &nbsp; &nbsp; &nbsp; this-&gt;unit_number = args[1]-&gt;unit_number &gt;= 0 ? (string)args[1]-&gt;unit_number : "";</div></div><div class=""><div class="">&nbsp; &nbsp; &nbsp; &nbsp; @[args[1]-&gt;device_name, this-&gt;unit_number, execname, pid] = sum(args[0]-&gt;bio_bcount);</div></div><div class=""><div class="">}</div></div><div class=""><div class=""><br class=""></div></div><div class=""><div class="">END</div></div><div class=""><div class="">{</div></div><div class=""><div class="">&nbsp; &nbsp; &nbsp; &nbsp; printf("%10s%-3s %20s %10s %15s\n", "DEVICE", "", "APP", "PID", "BYTES");</div></div><div class=""><div class="">&nbsp; &nbsp; &nbsp; &nbsp; printa("%10s%-3s %20s %10d %15@d\n", @);</div></div><div class=""><div class="">}</div></div></blockquote><div class=""><div class=""><br class=""></div></div><div class="">(Of course, the `(string)` cast does not work here because it's just not how DTrace works.)</div><div class=""><br class=""></div><div class="">Best,</div><div class="">Mateusz</div></body></html>
home | help

Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?317C65CC-5BF0-422D-80E9-4340CD241569>