sys_close_range(9)

✨ NAME ✨

Bestie, meet sys_close_range 💖 — the call that closes all file descriptors in a given range. This page is straight from the Kernel API Manual, and it's here to explain the whole sys_close_range(9) situation with zero gatekeeping 🫶.

🦋 SYNOPSIS 🦋

long sys_close_range (unsigned int fd , unsigned int max_fd , unsigned int flags );

🎀 ARGUMENTS 🎀

• fd — starting file descriptor to close. That's where the range begins, periodt 💅.
• max_fd — last file descriptor to close. That's the end of the range, iykyk.
• flags — CLOSE_RANGE flags. Yep, that's the flag situation ✨.

💅 DESCRIPTION 💅

Okay so here's the tea ☕: this closes a range of file descriptors. All file descriptors from fd up to and including max_fd are closed — yes, max_fd is included, bestie, don't forget it 🔥.

Currently, errors to close a given file descriptor are ignored 🙈. That's the documented behaviour: ignored.

🔥 SEE ALSO 🔥

Kernel file ./fs/file.c — go peek if you're nosy 👀 — and the related pages are:

• __file_ref_put(9)
• fd_install(9)
• file_close_fd_locked(9)
• last_fd(9)
• file_close_fd(9)
• get_file_rcu(9)
• get_file_active(9)
• receive_fd(9)

That's the whole page, bestie 🎀 source/version: ./fs, date: October 2026. sys_close_range(9) out 💅✨