From nobody Tue Aug 30 15:58:26 2022 X-Original-To: freebsd-dtrace@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4MHBml5YqQz4Zmt3 for ; Tue, 30 Aug 2022 15:58:31 +0000 (UTC) (envelope-from domagoj.stolfa@gmail.com) Received: from mail-wm1-x333.google.com (mail-wm1-x333.google.com [IPv6:2a00:1450:4864:20::333]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1D4" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4MHBmk4YDVz41T9 for ; Tue, 30 Aug 2022 15:58:30 +0000 (UTC) (envelope-from domagoj.stolfa@gmail.com) Received: by mail-wm1-x333.google.com with SMTP id n23-20020a7bc5d7000000b003a62f19b453so10216068wmk.3 for ; Tue, 30 Aug 2022 08:58:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; 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Tue, 30 Aug 2022 08:58:28 -0700 (PDT) Received: from [10.16.0.14] ([141.98.252.163]) by smtp.gmail.com with ESMTPSA id e7-20020a5d4e87000000b0022587413219sm10043566wru.16.2022.08.30.08.58.26 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 30 Aug 2022 08:58:27 -0700 (PDT) Content-Type: multipart/alternative; boundary="------------1viIHluN1HYGP4F0X3I01dDB" Message-ID: Date: Tue, 30 Aug 2022 16:58:26 +0100 List-Id: A discussion list for developers working on DTrace in FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-dtrace List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-dtrace@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.0 Subject: Re: Converting int to a string in DTrace To: freebsd-dtrace@freebsd.org References: <317C65CC-5BF0-422D-80E9-4340CD241569@FreeBSD.org> From: Domagoj Stolfa In-Reply-To: <317C65CC-5BF0-422D-80E9-4340CD241569@FreeBSD.org> X-Rspamd-Queue-Id: 4MHBmk4YDVz41T9 X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; 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RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::333:from]; DKIM_TRACE(0.00)[gmail.com:+]; RCVD_TLS_LAST(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+,1:+,2:~]; MLMMJ_DEST(0.00)[freebsd-dtrace@freebsd.org] X-ThisMailContainsUnwantedMimeParts: N This is a multi-part message in MIME format. --------------1viIHluN1HYGP4F0X3I01dDB Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi Mateusz: I believe that lltostr might be what you're looking for?         this->unit_number = args[1]->unit_number >= 0 ? lltostr(args[1]->unit_number) : ""; -- Domagoj On 8/30/2022 4:49 PM, Mateusz Piotrowski wrote: > 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 --------------1viIHluN1HYGP4F0X3I01dDB Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 8bit

Hi Mateusz:


I believe that lltostr might be what you're looking for?


        this->unit_number = args[1]->unit_number >= 0 ? lltostr(args[1]->unit_number) : "";


--
Domagoj

On 8/30/2022 4:49 PM, Mateusz Piotrowski wrote:
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
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