tree-wide: remove Lennart's copyright lines

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

diff --git a/src/basic/time-util.c b/src/basic/time-util.c
index dc8db13c261a5327451ec4f27833ffd5a449c8e6..6bd86bf4d39405a08cc3591c34978677d00b7628 100644 (file)
--- a/src/basic/time-util.c
+++ b/src/basic/time-util.c
@@ -1,9 +1,4 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
-/***
-  This file is part of systemd.
-
-  Copyright 2010 Lennart Poettering
-***/
 
 #include <errno.h>
 #include <limits.h>
@@ -1326,6 +1321,9 @@ bool timezone_is_valid(const char *name, int log_level) {
         if (slash)
                 return false;
 
+        if (p - name >= PATH_MAX)
+                return false;
+
         t = strjoina("/usr/share/zoneinfo/", name);
 
         fd = open(t, O_RDONLY|O_CLOEXEC);
@@ -1496,3 +1494,27 @@ bool in_utc_timezone(void) {
 
         return timezone == 0 && daylight == 0;
 }
+
+int time_change_fd(void) {
+
+        /* We only care for the cancellation event, hence we set the timeout to the latest possible value. */
+        static const struct itimerspec its = {
+                .it_value.tv_sec = TIME_T_MAX,
+        };
+
+        _cleanup_close_ int fd;
+
+        assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX));
+
+        /* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever CLOCK_REALTIME makes a jump relative to
+         * CLOCK_MONOTONIC. */
+
+        fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
+        if (fd < 0)
+                return -errno;
+
+        if (timerfd_settime(fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0)
+                return -errno;
+
+        return TAKE_FD(fd);
+}