Programming :: Get The Creation Time Of A Process Via Pid In C++

Scenario: ( in C++ code)

I need a process A to be able to get the start time of process B. I have the PID of the process B.

I would have thought there would be a simple system call to make by passing in the pid of Process B, but I don't thing there is??!!

So my other thought is to create a script that will be passed the pid and either I can read the file creation of /proc/<PID>/stat or I could also parse the start time of ps on the <PID>. This script can be ran from the C++ code. My difficulty is capturing this information in the C++ code. If I run exec ( or system if not a script) I need the results in a program variable....not stdout.

My only solution is write it to a tmp file and read it back into the program variable. Seems rather arguious but a least it would work.

Background - I need to port Windows code ( GetProcessTimes(creationtime,...))