Date: Sun, 17 Nov 2013 12:06:47 +0800 (SGT) From: Prashanth Kumar <pra_udupi@yahoo.co.in> To: Mark Johnston <markj@freebsd.org> Cc: "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> Subject: Re: Fw: your mail Message-ID: <1384661207.68304.YahooMailBasic@web192604.mail.sg3.yahoo.com> In-Reply-To: <20131117044801.GB64214@charmander>
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Hi Mark,
It was tested on FreeBSD 9.2 and FreeBSD 10 Beta - i386.I did not=20
test it on AMD 64.
Regards
Prashanth
--------------------------------------------
On Sun, 17/11/13, Mark Johnston <markj@freebsd.org> wrote:
Subject: Re: Fw: your mail
To: "Prashanth Kumar" <pra_udupi@yahoo.co.in>
Cc: "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org>
Date: Sunday, 17 November, 2013, 10:18 AM
=20
On Tue, Nov 12, 2013 at 08:42:39PM
+0800, Prashanth Kumar wrote:
> Hi Mark
>=20
> ---------------------------------------
> /* scan.c */
>=20
> #include <stdio.h>
>=20
> int main()
> {
> =A0=A0=A0 int str[10];
>=20
> =A0=A0=A0 if (scanf("%s", str) > 0)
> =A0=A0=A0 =A0=A0=A0 printf("name %s\n", str);
>=20
> =A0=A0=A0 return 0;
> }
> -----------------------------
> > "dtrace -n 'pid$target:::entry' -c scanf"
>=20
> if you run the above dtrace command on the program ,
dtrace will not exit and hung in input.
=20
I can't reproduce that problem. If I use
'pid$target:::entry', dtrace(1)
matches ~3000 probes and usually exits immediately with
"processing aborted: No error".
=20
If I instead use 'pid$target:ld-elf.so.*::entry', I get:
=20
markj@charmander: ~/src/dtrace/tls $ sudo dtrace -n
'pid$target:ld-elf.so.*::entry' -c ./test
dtrace: description 'pid$target:ld-elf.so.*::entry' matched
21 probes
CPU=A0 =A0=A0=A0ID=A0 =A0 =A0 =A0
=A0 =A0 =A0 =A0 =A0 =A0 FUNCTION:NAME
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
mark
name: mark
dtrace: pid 75490 has exited
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39804=A0 =A0 =A0 =A0 =A0
=A0=A0=A0__tls_get_addr:entry=20
=A0 2=A0 39786=A0 =A0 =A0 =A0 =A0
=A0 _rtld_addr_phdr:entry=20
=20
What version of FreeBSD are you using? Are you i386 or
amd64? (I'm on
amd64.)
=20
-Mark
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