In Linux you can check /proc//fd directory – for every open fd there will be a file, named as handle. I’m almost sure this way is non-portable. Alternatively you can use lsof – available for Linux, AIX, FreeBSD and NetBSD, according to man lsof .

How do I monitor file descriptors in Linux?

Linux: Find Out How Many File Descriptors Are Being Used

1. Step # 1 Find Out PID. To find out PID for mysqld process, enter: …
2. Step # 2 List File Opened By a PID # 28290. Use the lsof command or /proc/$PID/ file system to display open fds (file descriptors), run: …
3. Tip: Count All Open File Handles. …
4. More about /proc/PID/file & procfs File System.

21 авг. 2007 г.

What are file handles in Linux?

A file descriptor (Unix, Linux) or a file handle (Windows) is the connection id (generally to a file) from the Operating system in order to perform IO operations (Input/Ouput of Bytes). … You can also see a file descriptor as an object that a process uses to: read or write to an open file. open network sockets.