X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Futils.c;h=08139e5e2cb23d691c92c6800cef841e2362bc57;hp=3442bef8922a276120e70cab43d3b46ca97ec05f;hb=2daf65025e0fe5c15179dc4bfb26f875e3d31a26;hpb=9a6545985844978f34f88b82bf1bcd649968c0a3

diff --git a/src/common/utils.c b/src/common/utils.c
index 3442bef89..08139e5e2 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -41,6 +41,7 @@
 
 #include "utils.h"
 #include "defaults.h"
+#include "time.h"
 
 /*
  * Return a partial realpath(3) of the path even if the full path does not
@@ -1645,3 +1646,38 @@ int utils_show_help(int section, const char *page_name,
 end:
 	return ret;
 }
+
+LTTNG_HIDDEN
+int timespec_to_ms(struct timespec ts, unsigned long *ms)
+{
+	unsigned long res, remain_ms;
+
+	if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
+		errno = EOVERFLOW;
+		return -1;	/* multiplication overflow */
+	}
+	res = ts.tv_sec * MSEC_PER_SEC;
+	remain_ms = ULONG_MAX - res;
+	if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
+		errno = EOVERFLOW;
+		return -1;	/* addition overflow */
+	}
+	res += ts.tv_nsec / NSEC_PER_MSEC;
+	*ms = res;
+	return 0;
+}
+
+LTTNG_HIDDEN
+struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
+{
+	uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
+			(uint64_t) t1.tv_nsec;
+	uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
+			(uint64_t) t2.tv_nsec;
+	uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
+	struct timespec res;
+
+	res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
+	res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
+	return res;
+}