last_fd(9)

last_fd(9) 🎀

okay bestie, this is the Kernel API Manual page for last_fd, and it's lowkey a tiny little icon. it does exactly one job and does it slayfully ✨

NAME 🌸

last_fd — return last valid index into fd table

SYNOPSIS ✨

unsigned last_fd (struct fdtable *fdt );

ARGUMENTS 🫶

• fdt — File descriptor table.

CONTEXT 💅

Either rcu read lock or files_lock must be held. no cap, that's the vibe check: you gotta have one of those held before you call this 🫶

RETURN 🎀

Last valid index into fdtable.

SEE ALSO 🔥

Kernel file ./fs/file.c __file_ref_put(9), fd_install(9), file_close_fd_locked(9), sys_close_range(9), file_close_fd(9), get_file_rcu(9), get_file_active(9), receive_fd(9).

okay that's the whole thing, bestie 💖 this page is from ./fs, dated October 2026, and it's the last_fd(9) manual page. go forth and hold that lock 🫶✨