I started making a small research on my jailbroken iOS device and I was wondering which files does a specific process touches while I was using it. In order to do so, I wanted to use the famous lsof , so I downloaded the package from saurik's packages using Cydia, only to find out that the given lsof is not working on my device: lsof: PID 40 information error: Cannot allocate memory lsof: PID 39 information error: Cannot allocate memory lsof: PID 38 information error: Cannot allocate memory lsof: PID 37 information error: Cannot allocate memory lsof: PID 36 information error: Cannot allocate memory lsof: PID 35 information error: Cannot allocate memory lsof: PID 33 information error: Cannot allocate memory lsof: PID 31 information error: Cannot allocate memory After trying to figure it out, I decided that it would be the best to just try compiling my own lsof and use it on the device (I also liked the challenge :-) ) So my journey begins with downloading lsof from Apple'