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authorRich Felker <dalias@aerifal.cx>2011-04-05 15:38:20 -0400
committerRich Felker <dalias@aerifal.cx>2011-04-05 15:38:20 -0400
commitf209440bcfb5bee2386f00392f00f68c716850ce (patch)
treed65931cea9bcfec75a326655e966e9bf2ec021d2 /src/linux/adjtime.c
parent2c4e9e6e4b570f4dbbcc5f2402b0257a3b43380a (diff)
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implement the adjtime and adjtimex functions (nonstandard)
Diffstat (limited to 'src/linux/adjtime.c')
-rw-r--r--src/linux/adjtime.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/linux/adjtime.c b/src/linux/adjtime.c
new file mode 100644
index 00000000..fa8af9f0
--- /dev/null
+++ b/src/linux/adjtime.c
@@ -0,0 +1,27 @@
+#define _GNU_SOURCE
+#include <sys/time.h>
+#include <sys/timex.h>
+#include <errno.h>
+#include "syscall.h"
+
+int adjtime(const struct timeval *in, struct timeval *out)
+{
+	struct timex tx = { 0 };
+	if (in) {
+		if (in->tv_sec > 1000 || in->tv_usec > 1000000000) {
+			errno = EINVAL;
+			return -1;
+		}
+		tx.offset = in->tv_sec*1000000 + in->tv_usec;
+		tx.modes = ADJ_OFFSET_SINGLESHOT;
+	}
+	if (syscall(SYS_adjtimex, &tx) < 0) return -1;
+	if (out) {
+		out->tv_sec = tx.offset / 1000000;
+		if ((out->tv_usec = tx.offset % 1000000) < 0) {
+			out->tv_sec--;
+			out->tv_usec += 1000000;
+		}
+	}
+	return 0;
+}