TCP

Socket File Descriptors and Their Kernel Structures A socket is a special type of file descriptor (FD) in Linux, represented as socket:[inode]. Unlike regular file FDs, socket FDs point to in-memory kernel structures, not disk inodes. The /proc/<pid>/fd directory lists all FDs for a process, including sockets. The inode number of a socket can be used to inspect its details via tools like ss and /proc/net/tcp. Example: Checking Open FDs for Process 216 ls -l /proc/216/fd Output: ...