posix: implement clock_getcpuclockid function

Implements clock_getcpuclockid function Fixes #59954 Signed-off-by: Jai Arora <infolinesoni@gmail.com>
zephyrproject-rtos · Jan 8, 2024 · a3573a9 · a3573a9
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diff --git a/include/zephyr/posix/time.h b/include/zephyr/posix/time.h
@@ -69,6 +69,10 @@ extern "C" {
 #define CLOCK_REALTIME 1
 #endif
 
+#ifndef CLOCK_PROCESS_CPUTIME_ID
+#define CLOCK_PROCESS_CPUTIME_ID 2
+#endif
+
 #ifndef CLOCK_MONOTONIC
 #define CLOCK_MONOTONIC 4
 #endif
@@ -84,6 +88,7 @@ static inline int32_t _ts_to_ms(const struct timespec *to)
 
 int clock_gettime(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 */
 int timer_create(clockid_t clockId, struct sigevent *evp, timer_t *timerid);
 int timer_delete(timer_t timerid);

diff --git a/lib/posix/clock.c b/lib/posix/clock.c
@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <zephyr/posix/time.h>
 #include <zephyr/posix/sys/time.h>
+#include <zephyr/posix/unistd.h>
 #include <zephyr/internal/syscall_handler.h>
 #include <zephyr/spinlock.h>
 
@@ -222,3 +223,15 @@ int gettimeofday(struct timeval *tv, void *tz)
 
 	return res;
 }
+
+int clock_getcpuclockid(pid_t pid, clockid_t *clock_id)
+{
+	/* We don't allow any process ID but our own.  */
+	if (pid != 0 && pid != getpid()) {
+		return EPERM;
+	}
+
+	*clock_id = CLOCK_PROCESS_CPUTIME_ID;
+
+	return 0;
+}