attaching to foreground process with strace in sh script
By Katsumii-Oracle on 1 25, 2013
Apparently, it is not only the Oracle employees who use strace on foreground to process to get some info.
To find out how it is implemented, I have traced Oracle foreground processes.
Last week, I had to do same in shell script for trouble shooting. Here are the lines.
I think one can do same with dtrace or debugger.
#!/bin/bash ( sleep 3 ora_fg_pid=$(pgrep -P $(pgrep -P $$ sqlplus)) lsof -p $ora_fg_pid > /tmp/$ora_fg_pid.strace echo -e "\n= = = =strace begings here= = = =\n" >> /tmp/$ora_fg_pid.strace strace -fp $ora_fg_pid >> /tmp/$ora_fg_pid.strace 2>&1 ) & sqlplus -S scott/tiger <<EOF --Wait for strace to attach. execute user_lock.sleep(500) --Do real stuff. select * from dual / EOF