Re: how to know the files opened by a process

For an OS that has a /proc, you can File::Find on the /proc/\d+/fd/ nodes. They will be a symlink to the opened files of each process currently running.

# ls -l /proc/####/fd/
total 3
lr-x------ 1 root root 64 Dec 26 02:46 0 -> /proc/kmsg
lrwx------ 1 root root 64 Dec 26 02:46 1 -> socket:[11384]
lr-x------ 1 root root 64 Dec 26 02:46 2 -> /boot/System.map-2.6.14-2-
+k7
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Re^2: how to know the files opened by a process by tirwhan (Abbot) on Dec 26, 2005 at 09:38 UTC
This will only give you the opened file descriptors for the process, it does not give you memory-mapped files(`/proc/###/maps`), the current working directory (`/proc/###/cwd`) or indeed the binary itself(`/proc/###/exe`). (All of these are for Linux btw, I have no idea whether this is the same on Sun OS) In answer to the OP's question, I once looked for the same thing and don't know of an existing module that does this. If you're looking for a cross-platform solution I'd suggest going with McDarrens suggestion to use the lsof binary and parse its output(that's what I did, I'd post code, but I don't own it and it was bog-standard parsing stuff anyway). It'll be easier to compensate for syntax and output differences of lsof than to mimic its behaviour on different platforms. A computer is a state machine. Threads are for people who can't program state machines. -- Alan Cox	[reply] [d/l] [select]

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Re^2: how to know the files opened by a process
by tirwhan (Abbot) on Dec 26, 2005 at 09:38 UTC

This will only give you the opened file descriptors for the process, it does not give you memory-mapped files(/proc/###/maps), the current working directory (/proc/###/cwd) or indeed the binary itself(/proc/###/exe). (All of these are for Linux btw, I have no idea whether this is the same on Sun OS)

In answer to the OP's question, I once looked for the same thing and don't know of an existing module that does this. If you're looking for a cross-platform solution I'd suggest going with McDarrens suggestion to use the lsof binary and parse its output(that's what I did, I'd post code, but I don't own it and it was bog-standard parsing stuff anyway). It'll be easier to compensate for syntax and output differences of lsof than to mimic its behaviour on different platforms.

A computer is a state machine. Threads are for people who can't program state machines. -- Alan Cox

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