Obtaining path name from PID

Hi, this is a programming question that I have not been able to find an answer to, so I'm hoping someone here can help...
I am writing a C++ program that will be called by several different scripts. The program needs to log its invocations into a file and we would like to record the full path name of the calling script (e.g. /abc/defgh/script1.sh).
Rather than have the calling scripts explicitly pass their full path, I would prefer to have the called program determine it's caller's path. I know I can get the caller's PID but is there a way to translate that to the pathname? I tried opening /proc/<pid>/psinfo and looking up the 'pr_fname' member of the 'prpsinfo_t' structure but that didn't work.
Any ideas?
Thanks in advance for any help.
spc

you might want to take a look at pwdx and the proc
man page in section 4. But be aware that a the point
that you determine the working directory of the
parrent process, it might have a different cwd than
at the time your program was exec'ed.
TomTom,
thanks for the response. I did look at proc(4) and that's why I mentioned looking up the /proc/<pid>/psinfo file for each process. Unfortunately that did not give me the information I was looking for.
As for pwdx it gives the current working directory of a process - not the directory where it was run from (e.g. a script could reside at /tmp/abc.sh but have /home/t/test as its cwd). Do you know how to determine the pathname of the script?
thanks,
spc

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