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posix: clock: implement clock_getres()

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clock_getres() is required by the POSIX_TIMERS Option Group
as detailed in Section E.1 of IEEE-1003.1-2017.

The POSIX_TIMERS Option Group is required for PSE51, PSE52,
PSE53, and PSE54 conformance, and is otherwise mandatory for
any POSIX conforming system as per Section A.2.1.3 of
IEEE-1003-1.2017.

With this, we have complete support for the POSIX_TIMERS
Option Group.

Signed-off-by: Christopher Friedt <cfriedt@meta.com>
This commit is contained in:
Christopher Friedt 2024-03-20 18:02:34 -04:00 committed by Chris Friedt
parent 06f6c5c992
commit d36dd8097e
2 changed files with 23 additions and 0 deletions
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1
include/zephyr/posix/time.h
View file

@ -87,6 +87,7 @@ static inline int32_t _ts_to_ms(const struct timespec *to)
}
int clock_gettime(clockid_t clock_id, struct timespec *ts);
int clock_getres(clockid_t clock_id, struct timespec *ts);
int clock_settime(clockid_t clock_id, const struct timespec *ts);
int clock_getcpuclockid(pid_t pid, clockid_t *clock_id);
/* Timer APIs */

22
lib/posix/options/clock.c
View file

@ -97,6 +97,28 @@ int clock_gettime(clockid_t clock_id, struct timespec *ts)
return 0;
}
int clock_getres(clockid_t clock_id, struct timespec *res)
{
BUILD_ASSERT(CONFIG_SYS_CLOCK_TICKS_PER_SEC > 0 &&
CONFIG_SYS_CLOCK_TICKS_PER_SEC <= NSEC_PER_SEC,
"CONFIG_SYS_CLOCK_TICKS_PER_SEC must be > 0 and <= NSEC_PER_SEC");
if (!(clock_id == CLOCK_MONOTONIC || clock_id == CLOCK_REALTIME ||
clock_id == CLOCK_PROCESS_CPUTIME_ID)) {
errno = EINVAL;
return -1;
}
if (res != NULL) {
*res = (struct timespec){
.tv_sec = 0,
.tv_nsec = NSEC_PER_SEC / CONFIG_SYS_CLOCK_TICKS_PER_SEC,
};
}
return 0;
}
/**
* @brief Set the time of the specified clock.
*