put_itimerspec64(9)

put_itimerspec64(9) — the Kernel API Manual, bestie edition 💅

okay so like, welcome to the put_itimerspec64(9) page from the Kernel API Manual ✨ — yes that's a section 9 page, kernel-internals territory, and yes you're gonna slay it.

---

🌸 NAME 🌸

put_itimerspec64 — the little function that converts a &struct itimerspec64 into __kernel_itimerspec format and then copies the latter over to userspace 🫶

Like, it's giving "kernel side in, user side out." Translation era fr fr.

---

✨ SYNOPSIS ✨

int put_itimerspec64 (const struct itimerspec64 *it , struct
__kernel_itimerspec __user *uit );

that's the whole signature, no cap 😌

---

🎀 ARGUMENTS 🎀

• it — the input struct itimerspec64, literally the thing you're converting from 💖
• uit — the user's struct __kernel_itimerspec, aka where it ends up 🦋

---

⭐ RETURN ⭐

0 on success, or a negative errno on error. that's it, that's the vibe check ✅

ngl bestie, always check the return value. negative errno is not a cute look to ignore 🙈

---

💜 SEE ALSO 💜

the main character file here is ./kernel/time/time.c, and honestly the whole time-conversion friend group showed up 👑

• jiffies_to_msecs(9)
• jiffies_to_usecs(9)
• mktime64(9)
• set_normalized_timespec64(9)
• ns_to_timespec64(9)
• __msecs_to_jiffies(9)
• __usecs_to_jiffies(9)
• timespec64_to_jiffies(9)
• jiffies_to_timespec64(9)
• jiffies_to_clock_t(9)
• clock_t_to_jiffies(9)
• jiffies_64_to_clock_t(9)
• nsec_to_clock_t(9)
• jiffies64_to_nsecs(9)
• jiffies64_to_msecs(9)
• nsecs_to_jiffies64(9)
• nsecs_to_jiffies(9)
• timespec64_add_safe(9)
• get_timespec64(9)
• put_timespec64(9)
• get_old_timespec32(9)
• put_old_timespec32(9)
• get_itimerspec64(9)
• get_old_itimerspec32(9)
• put_old_itimerspec32(9)

like, the entire time-conversion group chat 😭💀 go read them, iykyk.

---

and that's the page!! this lil icon lives in ./kernel/time and the source/version is ./kernel/time with a date of October 2026 — so yeah, mark your calendars bestie 🗓️💖 mwah, go convert some timer specs, periodt 🧚✨