Well it turns out that various proc commands (pldd, pstack to name a few)
send process control messages to the process by writing to /proc/PID/ctl.
One of those commands is PCRUN which makes the process runnable.
I noticed though that if I stopped the process outside of DTrace with pstop,
the process stayed stopped even after running these procfs commands.
So all I had to do to work around this was add a pstop command after the DTrace
stop():
stop();
system("pstop %d",pid)
... collect till my heart's content
system("prun %d",pid);
Jim
> Hi,
>
> I'm using the rexit/stop()/prun() dance to capture
> process exit in order to grab various procfs commands
> on exit. Works fine for simple program like "sleep".
> But for Java (and other threaded customer apps) it
> runs one or 2 of the p-commands, but the process goes
> away before I can get all I want:
>
> $ cat exit.d
> #!/usr/sbin/dtrace -qws
>
> syscall::rexit:entry
> /execname == "sleep" || execname == "java"/
> {
> stop();
> system("pargs %d",pid);
> system ("pldd %d",pid);
> system ("pfiles %d",pid);
> system ("pstack %d",pid);
> system ("prun %d",pid);
>
>
> $ ./exit.d&
> [1] 22487
>
> OK, now test a "sleep" exit:
>
> bash-3.00$ sleep 5
> 22488: sleep 5
> argv[0]: sleep
> argv[1]: 5
> 22488: sleep 5
> /lib/libc.so.1
> /usr/lib/locale/en_US.ISO8859-1/en_US.ISO8859-1.so.3
> 22488: sleep 5
> Current rlimit: 256 file descriptors
> 0: S_IFCHR mode:0620 dev:287,0 ino:12582952 uid:5667
> gid:7 rdev:24,18
> O_RDWR
> /devices/pseudo/p...@0:18
> 1: S_IFCHR mode:0620 dev:287,0 ino:12582952
> uid:5667 gid:7 rdev:24,18
> O_RDWR
> /devices/pseudo/p...@0:18
> 2: S_IFCHR mode:0620 dev:287,0 ino:12582952
> uid:5667 gid:7 rdev:24,18
> O_RDWR
> /devices/pseudo/p...@0:18
> 2488: sleep 5
> feea4d18 ecvt (2, 8047290, 8047296, 0, 8047298,
> 8047306)
>
> Looks like all the p-commands completed. But for
> java:
>
> 0$ /usr/java/bin/java -version
> java version "1.5.0_20"
> Java(TM) 2 Runtime Environment, Standard Edition
> (build 1.5.0_20-b02)
> Java HotSpot(TM) Client VM (build 1.5.0_20-b02, mixed
> mode, sharing)
> 22513: /usr/java/bin/java -version
> argv[0]: /usr/java/bin/java
> argv[1]: -version
> 22513: /usr/java/bin/java -version
> /lib/libthread.so.1
> /lib/libdl.so.1
> /lib/libc.so.1
> /usr/jdk/instances/jdk1.5.0/jre/lib/i386/client/libjvm
> .so
> /lib/libsocket.so.1
> /usr/lib/libsched.so.1
> /usr/lib/libCrun.so.1
> /lib/libm.so.1
> /lib/libnsl.so.1
> /lib/libm.so.2
> /lib/libscf.so.1
> /lib/libdoor.so.1
> /lib/libuutil.so.1
> /lib/libgen.so.1
> /lib/libmd.so.1
> /lib/libmp.so.2
> /usr/jdk/instances/jdk1.5.0/jre/lib/i386/native_thread
> s/libhpi.so
> /usr/jdk/instances/jdk1.5.0/jre/lib/i386/libverify.so
> /usr/jdk/instances/jdk1.5.0/jre/lib/i386/libjava.so
> /usr/jdk/instances/jdk1.5.0/jre/lib/i386/libzip.so
> /usr/lib/locale/en_US.ISO8859-1/en_US.ISO8859-1.so.3
> bash-3.00$ pfiles: cannot examine 22513: no such
> process
> pstack: cannot examine 22513: no such process or core
> file
> prun: cannot control 22513: no such process
>
>
> Any ideas? Something is telling the process to
> continue.
>
> Jim
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