continuously monitor program

[nychris]

I have a systemtap script (loop.stp) that continuously runs and prints output periodically. I want to monitor this output from a perl script. Why does this code below not print anything? If I change this to /bin/ps, it does print the entire output when the command exits. I need it to print output as it occurs since the program will never end.

open(STAP, "/root/loop.stp");
while ( <STAP> ) {
  print;
}

 

[nychris]

Typo above, I forgot the pipe. This only prints when the command exits, not in real time.

open(STAP, "/root/loop.stp |");
while ( <STAP> ) {
  print;
}

--
Chris
RHCE, SCSA, AIX5L, LPIC, CNE, CCNA, MCSE

 

[nychris]

FYI, forgot to include this in the original post. If I change the program to monitor another perl script and add "$| = 1" in the other perl script, this works. I need to do the equivalent in the systemtap script somehow.

Thanks!