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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | NOTES | SEE ALSO | COLOPHON |
SD_EVENT_NOW(3) sd_event_now SD_EVENT_NOW(3)
sd_event_now - Retrieve current event loop iteration timestamp
#include <systemd/sd-event.h>
int sd_event_now(sd_event *event, clockid_t clock, uint64_t *usec);
sd_event_now() returns the time when the most recent event loop
iteration began. A timestamp is taken right after returning from the
event sleep, and before dispatching any event sources. The event
parameter specifies the event loop object to retrieve the timestamp
from. The clock parameter specifies the clock to retrieve the
timestamp for, and is one of CLOCK_REALTIME (or equivalently
CLOCK_REALTIME_ALARM), CLOCK_MONOTONIC, or CLOCK_BOOTTIME (or
equivalently CLOCK_BOOTTIME_ALARM), see clock_gettime(2) for more
information on the various clocks. The retrieved timestamp is stored
in the usec parameter, in µs since the clock's epoch. If this
function is invoked before the first event loop iteration, the
current time is returned, as reported by clock_gettime(). To
distinguish this case from a regular invocation the return value will
be positive, and zero when the returned timestamp refers to an actual
event loop iteration.
If the first event loop iteration has not run yet sd_event_now()
writes current time to usec and returns a positive return value.
Otherwise, it will write the requested timestamp to usec and return
0. On failure, the call returns a negative errno-style error code.
Returned values may indicate the following problems:
-EINVAL
An invalid parameter was passed.
-EOPNOTSUPP
Unsupported clock type.
-ECHILD
The event loop object was created in a different process.
These APIs are implemented as a shared library, which can be compiled
and linked to with the libsystemd pkg-config(1) file.
systemd(1), sd-event(3), sd_event_new(3), sd_event_add_time(3),
clock_gettime(2)
This page is part of the systemd (systemd system and service manager)
project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a bug
report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩. This
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systemd 234 SD_EVENT_NOW(3)
Pages that refer to this page: sd-event(3), sd_event_add_child(3), sd_event_add_defer(3), sd_event_add_io(3), sd_event_add_signal(3), sd_event_add_time(3), systemd.directives(7), systemd.index(7)