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-rw-r--r--src/basic/time-util.c37
-rw-r--r--src/basic/time-util.h1
2 files changed, 24 insertions, 14 deletions
diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index 7ca764abeb..edd9179cb8 100644
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -1080,22 +1080,31 @@ bool timezone_is_valid(const char *name) {
return true;
}
-clockid_t clock_boottime_or_monotonic(void) {
- static clockid_t clock = -1;
- int fd;
-
- if (clock != -1)
- return clock;
-
- fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
- if (fd < 0)
- clock = CLOCK_MONOTONIC;
- else {
- safe_close(fd);
- clock = CLOCK_BOOTTIME;
+bool clock_boottime_supported(void) {
+ static int supported = -1;
+
+ /* Note that this checks whether CLOCK_BOOTTIME is available in general as well as available for timerfds()! */
+
+ if (supported < 0) {
+ int fd;
+
+ fd = timerfd_create(CLOCK_BOOTTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+ if (fd < 0)
+ supported = false;
+ else {
+ safe_close(fd);
+ supported = true;
+ }
}
- return clock;
+ return supported;
+}
+
+clockid_t clock_boottime_or_monotonic(void) {
+ if (clock_boottime_supported())
+ return CLOCK_BOOTTIME;
+ else
+ return CLOCK_MONOTONIC;
}
int get_timezone(char **tz) {
diff --git a/src/basic/time-util.h b/src/basic/time-util.h
index 77e3cd08d4..a5e3f567ec 100644
--- a/src/basic/time-util.h
+++ b/src/basic/time-util.h
@@ -112,6 +112,7 @@ bool ntp_synced(void);
int get_timezones(char ***l);
bool timezone_is_valid(const char *name);
+bool clock_boottime_supported(void);
clockid_t clock_boottime_or_monotonic(void);
#define xstrftime(buf, fmt, tm) \