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4
votes
2answers
1k views

What is the referent of a file descriptor?

My understanding is that a file descriptor is an integer which is a key in the kernel's per-process mapping to objects such as open()ed files, pipes, sockets, etc. Is there a proper, short, and ...
12
votes
2answers
4k views

/proc/PID/fd/X link number

In Linux, in /proc/PID/fd/X, the links for file descriptors that are pipes or sockets have a number, like: l-wx------ 1 user user 64 Mar 24 00:05 1 -> pipe:[6839] l-wx------ 1 user user 64 Mar 24 ...
14
votes
2answers
3k views

How do open files behave on linux systems?

I just renamed a log file to "foo.log.old", and assumed that the application will start writing a new logfile at "foo.log". I was surprised to discover that it tracked the logfile to its new name, and ...
4
votes
2answers
433 views

retrieving names of all open pdf files (in evince or otherwise)

I constantly have many PDF files open. These are usually downloaded using chrome and immediately opened using evince. I sometimes want to persist the state of all my open PDF files, so I could ...
1
vote
1answer
253 views

Release a port owned by third party application?

I have been consulted about any way to release a port owned by a third party application that is listening to it. Say the application uses sockets and is listening for an specific port the root now ...
4
votes
1answer
1k views

How do I tell a script to wait for a process to start accepting requests on a port?

I need a command that will wait for a process to start accepting requests on a specific port. Is there something in linux that does that? while (checkAlive -host localhost -port 13000 == false) ...
1
vote
1answer
185 views

Prevent libflashplayer.so from deleting a file?

I'm trying the preview release of Flash Player "Square" for Linux and noticed that video files are now being deleted from the /tmp/ folder. Yet the files are still in use (I can see them with lsof): ...
17
votes
4answers
4k views

How do I find out which processes are preventing unmounting of a device?

Sometimes, I would like to umount a usb device, but I get a drive is busy error. How do I find out which processes or programs are accessing the device?
9
votes
1answer
128 views

Strategies for maintaining a reference to a file after it was moved or renamed?

I've had a mac at work lately, and was amazed to see that Xcode would still find my latest project after I renamed its folder and moved it someplace else. Now I understand that this is the result of ...
11
votes
5answers
3k views

What is using this network socket?

I'm trying to use NTP to update the time on my machine. However, it gives me an error: host # ntpdate ntp1.example.org 10 Aug 12:38:50 ntpdate[7696]: the NTP socket is in use, exiting What does the ...
8
votes
6answers
2k views

How do I set a limit on the number of files Linux can have open?

I plan to run a Java app using nohup ... &. The limit must apply to commands like this.