---
name: "proc_pid_timers"
section: "5"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/proc_pid_timers"
---

# proc\_pid\_timers(5)

POSIX timers

## NAME

/proc/pid/timers - POSIX timers

## DESCRIPTION

- */proc/*pid*/timers* (since Linux 3.10)

  A list of the POSIX timers for this process. Each timer is listed with a line that starts with the string "ID:". For example:

-

  ```
  ID: 1
  signal: 60/00007fff86e452a8
  notify: signal/pid.2634
  ClockID: 0
  ID: 0
  signal: 60/00007fff86e452a8
  notify: signal/pid.2634
  ClockID: 1
  ```

-

  The lines shown for each timer have the following meanings:

  - *ID*

    The ID for this timer. This is not the same as the timer ID returned by [**timer\_create**(2)](/timer_create/2.md); rather, it is the same kernel-internal ID that is available via the *si\_timerid* field of the *siginfo\_t* structure (see [**sigaction**(2)](/sigaction/2.md)).

  - *signal*

    This is the signal number that this timer uses to deliver notifications followed by a slash, and then the *sigev\_value* value supplied to the signal handler. Valid only for timers that notify via a signal.

  - *notify*

    The part before the slash specifies the mechanism that this timer uses to deliver notifications, and is one of "thread", "signal", or "none". Immediately following the slash is either the string "tid" for timers with **SIGEV\_THREAD\_ID** notification, or "pid" for timers that notify by other mechanisms. Following the "." is the PID of the process (or the kernel thread ID of the thread)  that will be delivered a signal if the timer delivers notifications via a signal.

  - *ClockID*

    This field identifies the clock that the timer uses for measuring time. For most clocks, this is a number that matches one of the user-space **CLOCK\_\*** constants exposed via *\<time.h\>*. **CLOCK\_PROCESS\_CPUTIME\_ID** timers display with a value of -6 in this field. **CLOCK\_THREAD\_CPUTIME\_ID** timers display with a value of -2 in this field.

-

  This file is available only when the kernel was configured with **CONFIG\_CHECKPOINT\_RESTORE**.

## SEE ALSO

[**proc**(5)](/proc/5.md)