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website/content/en/status/report-2023-01-2023-03/timerfd.adoc

=== Native Linux timerfd === Native Linux timerfd
Links: + Links: +
link:https://reviews.freebsd.org/D38459[Differential revision] URL: link:https://reviews.freebsd.org/D38459[https://reviews.freebsd.org/D38459] link:https://reviews.freebsd.org/D38459[Differential revision] URL: link:https://reviews.freebsd.org/D38459[https://reviews.freebsd.org/D38459]
Contact: Jake Freeland <jfree@FreeBSD.org> Contact: Jake Freeland <jfree@FreeBSD.org>
The timerfd facility is a set of Linux-standard system calls that operate on interval timers. The timerfd facility is a set of Linux-standard system calls that operate on interval timers.
These timers are analogous to per-process timers but are represented by a file descriptor, rather than a process. These timers are analogous to per-process timers but are represented by a file descriptor, rather than a process.
These file descriptors may be passed to other processes, are preserved across fork(2), and may be monitored via kevent(2), poll(2), or select(2). These file descriptors may be passed to other processes, are preserved across man:fork[2], and may be monitored via man:kevent[2], man:poll[2], or man:select[2].
A timerfd implementation in FreeBSD already exists for Linux compatibility, but A timerfd implementation in FreeBSD already exists for Linux compatibility, but link:https://reviews.freebsd.org/D38459[this differential revision] makes the interface native.
grahamperrinUnsubmitted
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These file descriptors may be passed to other processes, are preserved across man:fork[2], and may be monitored via man:kevent[2], man:poll[2], or man:select[2].
- A timerfd implementation in FreeBSD already exists for Linux compatibility, but
- link:https://reviews.freebsd.org/D38459[this differential revision]
- makes the interface native.
+ A timerfd implementation in FreeBSD already exists for Linux compatibility, but link:https://reviews.freebsd.org/D38459[this differential revision] makes the interface native.
The goal behind this change is to ease the FreeBSD porting process for programs that include timerfd.
grahamperrin:
link:https://reviews.freebsd.org/D38459[this differential revision]
makes the interface native.
The goal behind this change is to ease the FreeBSD porting process for programs that include timerfd. The goal behind this change is to ease the FreeBSD porting process for programs that include timerfd.
This specific implementation avoids adding new names to the system call table. This specific implementation avoids adding new names to the system call table.
Instead, timerfd_create() is wrapped by the specialfd() system call. Instead, `timerfd_create()` is wrapped by the `specialfd()` system call.
The timerfd_gettime() and timerfd_settime() calls are wrapped ioctl()s. The `timerfd_gettime() and `timerfd_settime()` calls are wrapped `ioctl()` s.
Developers that wish to support FreeBSD should avoid using timerfd. Developers that wish to support FreeBSD should avoid using timerfd.
The kqueue() EVFILT_TIMER filter is preferred for establishing arbitrary timers. The `kqueue()` `EVFILT_TIMER` filter is preferred for establishing arbitrary timers.