Date: Tue, 10 Dec 2013 20:00:42 -0500 From: Mark Johnston <markj@freebsd.org> To: hiren panchasara <hiren.panchasara@gmail.com> Cc: freebsd-dtrace@freebsd.org Subject: Re: Examples from www.dtracebook.com Message-ID: <20131211010042.GB4080@raichu> In-Reply-To: <CALCpEUEPaiRkNfxBPynvOE7c_xOvtjt_CRSBLUpUDDPwTHscyQ@mail.gmail.com> References: <CALCpEUFnwN%2BmwTDyq-_q3x8jkk8EBfzMMyRzVeHDrHq=j-nqVg@mail.gmail.com> <20131210234714.GQ1681@albert.catwhisker.org> <CALCpEUGms0S%2BQue%2B6TmAZmRW4t8LZh02r-q%2Bvf1WupDkwcpH-Q@mail.gmail.com> <CALCpEUE7%2BPY9tCdc3R-cXfeXCy%2BRYmz9aNTKcbwat3tgvniORQ@mail.gmail.com> <20131211003245.GA4080@raichu> <CALCpEUEPaiRkNfxBPynvOE7c_xOvtjt_CRSBLUpUDDPwTHscyQ@mail.gmail.com>
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On Tue, Dec 10, 2013 at 04:54:36PM -0800, hiren panchasara wrote: > On Tue, Dec 10, 2013 at 4:32 PM, Mark Johnston <markj@freebsd.org> wrote: > > On Tue, Dec 10, 2013 at 04:26:54PM -0800, hiren panchasara wrote: > >> $ sudo dtrace -n 'proc:::exec-success { trace(curpsinfo->pr_psargs); }' > >> dtrace: description 'proc:::exec-success ' matched 1 probe > >> CPU ID FUNCTION:NAME > >> 5 48876 :exec-success /bin/sh /usr/bin/man ls > >> 2 48876 :exec-success /sbin/sysctl -n hw.machine_arch > >> 6 48876 :exec-success /sbin/sysctl -n hw.machine > >> 0 48876 :exec-success /usr/bin/locale > >> 7 48876 :exec-success /usr/bin/zcat > >> /usr/share/man/man1/ls.1.gz > >> 2 48876 :exec-success head -1 > >> 1 48876 :exec-success tbl > >> 6 48876 :exec-success groff -S -P-h -Wall > >> -mtty-char -man -Tascii -P-c > >> 7 48876 :exec-success /usr/bin/zcat > >> /usr/share/man/man1/ls.1.gz > >> 3 48876 :exec-success less > >> 3 48876 :exec-success troff -Wall -mtty-char > >> -man -Tascii > >> 7 48876 :exec-success grotty -h -c > >> > >> > >> 6 48876 :exec-success top > >> 7 48876 :exec-success ps awwux > >> 7 48876 :exec-success iostat > >> 5 48876 :exec-success vmstat 1 > >> 4 48876 :exec-success bash > >> 4 48876 :exec-success whois > >> 5 48876 :exec-success whoami > >> 4 48876 :exec-success devinfo > >> 4 48876 :exec-success dmesg > >> 6 48876 :exec-success pciconf -lv > >> > >> I am getting interesting info only when "man" is executed and not for > >> any other command. What does that tell me? How is man special? Other > >> programs must also be doing exec(2), no? > > > > /usr/bin/man is a shell script. You'll see similar output for any > > executable that starts with a shebang. > > Thanks Mark for responding but that doesn't seem true. > > I tried apropos(1) without luck. I get the following with "apropos dtrace": mark@raichu: ~ $ sudo dtrace -n 'proc:::exec-success {trace(curpsinfo->pr_psargs);}' Password: dtrace: description 'proc:::exec-success ' matched 1 probe CPU ID FUNCTION:NAME 4 35852 :exec-success /bin/sh /usr/bin/apropos dtrace 2 35852 :exec-success grep -Ehi -- dtrace /usr/share/man/whatis /usr/local/man/whatis /usr/share/openssl/man/whatis /usr/local/lib/perl5/5.14/man/whatis /usr/local/lib/perl5/5.14/perl/man/whatis 2 35852 :exec-success /usr/bin/less -i I don't really know what you mean by "interesting info." The other programs you ran (whoami, pciconf, dmesg, devinfo) above don't call execv().
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