From: Timo Sirainen <timo.sirainen@open-xchange.com>
Date: Mon, 3 Feb 2020 10:57:52 +0000 (+0200)
Subject: lib: Add i_nanoseconds() and i_microseconds()
X-Git-Tag: 2.3.10~96
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2666cfb8d5d234d73f3c24df477544c685524ab7;p=thirdparty%2Fdovecot%2Fcore.git

lib: Add i_nanoseconds() and i_microseconds()
---

diff --git a/src/lib/test-time-util.c b/src/lib/test-time-util.c
index b947a20c8b..823f76d880 100644
--- a/src/lib/test-time-util.c
+++ b/src/lib/test-time-util.c
@@ -335,6 +335,25 @@ static void test_strftime_fixed(void)
 	test_end();
 }
 
+static void test_micro_nanoseconds(void)
+{
+	uint64_t secs, usecs, nsecs;
+
+	test_begin("i_microseconds() and i_nanoseconds()");
+
+	secs = time(NULL);
+	usecs = i_microseconds();
+	nsecs = i_nanoseconds();
+
+	/* Assume max 1 seconds time difference between the calls. That should
+	   be more than enough, while still not failing if there are temporary
+	   hangs when running in heavily loaded systems. */
+	test_assert(usecs/1000000 - secs <= 1);
+	test_assert(nsecs/1000 - usecs <= 1000000);
+
+	test_end();
+}
+
 void test_time_util(void)
 {
 	test_timeval_cmp();
@@ -343,4 +362,5 @@ void test_time_util(void)
 	test_time_to_local_day_start();
 	test_strftime_now();
 	test_strftime_fixed();
+	test_micro_nanoseconds();
 }
diff --git a/src/lib/time-util.c b/src/lib/time-util.c
index 32688c1cd4..7e269cd38b 100644
--- a/src/lib/time-util.c
+++ b/src/lib/time-util.c
@@ -13,6 +13,15 @@ void i_gettimeofday(struct timeval *tv_r)
 		i_fatal("gettimeofday() failed: %m");
 }
 
+uint64_t i_nanoseconds(void)
+{
+	struct timespec ts;
+
+	if (clock_gettime(CLOCK_REALTIME, &ts) < 0)
+		i_fatal("clock_gettime() failed: %m");
+	return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
+}
+
 int timeval_cmp(const struct timeval *tv1, const struct timeval *tv2)
 {
 	if (tv1->tv_sec < tv2->tv_sec)
diff --git a/src/lib/time-util.h b/src/lib/time-util.h
index 139ebf6506..d872158527 100644
--- a/src/lib/time-util.h
+++ b/src/lib/time-util.h
@@ -5,6 +5,12 @@
 
 /* Same as gettimeofday(), but call i_fatal() if the call fails. */
 void i_gettimeofday(struct timeval *tv_r);
+/* Return nanoseconds since UNIX epoch (1970-01-01). */
+uint64_t i_nanoseconds(void);
+/* Return microseconds since UNIX epoch (1970-01-01). */
+static inline uint64_t i_microseconds(void) {
+	return i_nanoseconds() / 1000;
+}
 
 /* Returns -1 if tv1<tv2, 1 if tv1>tv2, 0 if they're equal. */
 int timeval_cmp(const struct timeval *tv1, const struct timeval *tv2);