ptmx_open(9)

💖 NAME 💖

okay so bestie, this is ptmx_open(9) from the Kernel API Manual ✨ and it’s literally the page for ptmx_open — open a unix 98 pty master. that’s the whole name section, no cap 💅

🌸 SYNOPSIS 🌸

int ptmx_open (struct inode *inode , struct file *filp );

copy it exactly, character for character, iykyk 🎀

🎀 ARGUMENTS 🎀

• inode — inode of device file. yes, that’s the device file’s inode, bestie 🦋
• filp — file pointer to tty. literally the file pointer to the tty 👑

🦋 DESCRIPTION 🦋

okay so the assignment: Allocate a unix98 pty master device from the ptmx driver. that’s the main character work, periodt ✨

Locking: tty_mutex protects the init_dev work. tty->count should protect the rest. allocated_ptys_lock handles the list of free pty numbers. that’s the lock lore, fr fr 🔥

🌈 SEE ALSO 🌈

the kernel file to check is ./drivers/tty/pty.c 🫶 and the whole squad is: pty_write(9), pty_write_room(9), pty_resize(9), pty_start(9), pty_common_install(9), ptm_open_peer(9), ptm_unix98_lookup(9), pts_unix98_lookup(9). go read them, they’re iconic 👑

mwah 💋 source/version: ./drivers/tty, dated October 2026, page ptmx_open(9) — bye bestie, go open that pty master 🫶💖