ptm_open_peer(9)

💖 NAME 💖

okay so bestie, you're looking at the Kernel API Manual page for ptm_open_peer(9) — and yes, the function is literally named ptm_open_peer. It does one thing and it does it iconically:

• ptm_open_peer — open the peer of a pty. periodt. 💅

---

✨ SYNOPSIS ✨

the signature is giving main character energy:

int ptm_open_peer (struct file *master , struct tty_struct *tty , int
       flags );

---

🎀 ARGUMENTS 🎀

• master — the open struct file of the ptmx device node. that's the whole vibe.
• tty — the master of the pty being opened. iconic.
• flags — the flags for open. yes, those flags. 🦋

---

🦋 DESCRIPTION 🦋

okay so the ~point~ here is to provide a race free way for userspace to open the slave end of a pty. that's the entire serve. 🔥

it's for the situation where they have the master fd and cannot access or trust the mount namespace /dev/pts was mounted inside. no cap, that's the exact scenario. 🙈

---

🔥 SEE ALSO 🔥

Kernel file ./drivers/tty/pty.c is the source-y bestie, and these are the friends:

• pty_write(9)
• pty_write_room(9)
• pty_resize(9)
• pty_start(9)
• pty_common_install(9)
• ptm_unix98_lookup(9)
• pts_unix98_lookup(9)
• ptmx_open(9)

---

that's the whole page, bestie 🫶 source/version is ./drivers/tty and the date is October 2026 — slay and goodbye 💋✨