Initial commitHEADmaster

2 files changed, 76 insertions, 0 deletions

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..f88526b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,17 @@
+CC ?= gcc
+CFLAGS ?= -O2 -pipe
+LDFLAGS ?= -s -static
+DESTDIR =
+
+.PHONY: all
+
+all: set_time
+
+set_time:
+	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) set_time.c
+
+install: set_time
+	install -D set_time $(DESTDIR)/sbin/set_time
+
+clean:
+	rm -f set_time
diff --git a/set_time.c b/set_time.c
new file mode 100644
index 0000000..9ed5398
--- /dev/null
+++ b/set_time.c
@@ -0,0 +1,59 @@
+/* set_time.c - save/restore system time based on mtime of current program file
+ *
+ * Based on fake-hwclock.c by Xan Manning from
+ * https://github.com/xanmanning/alarm-fake-hwclock/fake-hwclock.c
+ *
+ * Original license:
+ * -----------------------------------------------------------------------------
+ * "THE (COFFEE)WARE LICENSE" (Rev. 1):
+ * 
+ * <xan.manning@gmail.com> 
+ * wrote this file. As long as you retain this notice you can do whatever you
+ * want with this stuff. If we meet some day, and you think this stuff is
+ * worth it, you can buy me the above drink(s) in return.
+ *
+ * Xan Manning
+ * ----------------------------------------------------------------------------- 
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <utime.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+
+int main(int argc, char *argv[])
+{
+	struct stat sb;
+	time_t current_time;
+
+	current_time = time(NULL);
+	if (current_time == (time_t)-1) {
+		fprintf(stderr, "failed to get current time\n");
+		return 1;
+	}
+
+	if (stat(argv[0], &sb) == -1) {
+		fprintf(stderr, "stat failed: %s\n", argv[0]);
+		return 1;
+	}
+
+	if (current_time > sb.st_mtime) {
+		struct utimbuf utb = { current_time, current_time };
+		if (utime(argv[0], &utb) == -1) {
+			fprintf(stderr, "utime failed\n");
+			return 1;
+		}
+		printf("Current time saved\n");
+	}
+	else {
+		struct timespec ts = { current_time + 2, 0 };
+		if (clock_settime(CLOCK_REALTIME, &ts) == -1) {
+			fprintf(stderr, "clock_settime failed\n");
+			return 1;
+		}
+		printf("System time set\n");
+	}
+
+	return 0;
+}