Date: Tue, 10 Dec 2013 17:10:07 -0800 From: hiren panchasara <hiren.panchasara@gmail.com> To: Mark Johnston <markj@freebsd.org> Cc: freebsd-dtrace@freebsd.org Subject: Re: Examples from www.dtracebook.com Message-ID: <CALCpEUFyM_jvZ=f4bv-H%2BA0aBGr=2L0Mv1QmvkgFxou2dZ_K7g@mail.gmail.com> In-Reply-To: <20131211010042.GB4080@raichu> 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> <20131211010042.GB4080@raichu>
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On Tue, Dec 10, 2013 at 5:00 PM, Mark Johnston <markj@freebsd.org> wrote: > 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(). My bad. I am now seeing the o/p what you are seeing above. "interesting info" == exec calls :p Thanks a lot, Hiren
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