nspawn: make -U a tiny bit smarter

[elogind.git] / src / basic / time-util.c

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index bcf1d177e30c5a634c840d589db99a2fad20f6e6..2a3957d97ae2f1f2f596fac71f4979792a4faa60 100644 (file)
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -570,12 +570,12 @@ int parse_timestamp(const char *t, usec_t *usec) {
                 goto from_tm;
 
         } else if (streq(t, "yesterday")) {
-                tm.tm_mday --;
+                tm.tm_mday--;
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
                 goto from_tm;
 
         } else if (streq(t, "tomorrow")) {
-                tm.tm_mday ++;
+                tm.tm_mday++;
                 tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
                 goto from_tm;
         }
@@ -1075,22 +1075,31 @@ 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) {