close (nr 3)

Linux Signature

int close(int fd);

Description

Closes a file descriptor so that it no longer refers to any file and may be reused.

Current Implementation

Looks up fd in the current process’s file descriptor table. If found, calls FileHandle::close() on the handle and sets the table slot to None, making the fd number available for reuse.

• Returns 0 on success.
• Returns -EBADF (-9) if the fd is not open or out of range.

Source: osl/src/syscalls/fs.rs — sys_close

Future Work

• Flush pending writes for writable file handles before closing.
• Free resources held by the handle (e.g. release VFS locks).