How long do the symlinks form the File Descriptors in /proc/PID/fd/ are kept?
During the complete life of the process?
What about when this is a multi-threaded process?
Do I have the guaranty that after hours of work, all files that were open during some point in time will be listed here? Currently, the links in here are all numbered from 0 to n, with no number missing in between. Can the case occur that a number is missing? Or do a file simply disappears at same point, with no indication that it was ever open?