From e61a128e795e103758720c5f5e5fae86132d5269 Mon Sep 17 00:00:00 2001
From: Linem Davton <linemdavton@gmail.com>
Date: Fri, 3 May 2024 16:44:04 +0200
Subject: [PATCH] high resolution system time

---
 .gitignore      |  1 +
 clock_res.sh    | 31 +++++++++++++++++++++++++++++++
 high_res_time.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100644 .gitignore
 create mode 100755 clock_res.sh
 create mode 100644 high_res_time.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..567609b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+build/
diff --git a/clock_res.sh b/clock_res.sh
new file mode 100755
index 0000000..5e5a5c3
--- /dev/null
+++ b/clock_res.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Define a temporary source file
+SOURCE_FILE=$(mktemp /tmp/clock_getres.XXXXXX.c)
+
+# Create a C program to get clock resolutions
+cat <<EOF >$SOURCE_FILE
+#include <stdio.h>
+#include <time.h>
+
+void print_clock_res(clockid_t clk_id, const char* name) {
+    struct timespec res;
+    clock_getres(clk_id, &res);
+    printf("%s resolution: %ld seconds, %ld nanoseconds\\n", name, res.tv_sec, res.tv_nsec);
+}
+
+int main() {
+    print_clock_res(CLOCK_REALTIME, "CLOCK_REALTIME");
+    print_clock_res(CLOCK_MONOTONIC, "CLOCK_MONOTONIC");
+    return 0;
+}
+EOF
+
+# Compile the C program
+gcc -o /tmp/clock_getres $SOURCE_FILE
+
+# Run the compiled program
+/tmp/clock_getres
+
+# Clean up
+rm $SOURCE_FILE /tmp/clock_getres
diff --git a/high_res_time.c b/high_res_time.c
new file mode 100644
index 0000000..03e948c
--- /dev/null
+++ b/high_res_time.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <time.h>
+
+void print_clock_res(clockid_t clk_id, const char *name) {
+  struct timespec res;
+  clock_getres(clk_id, &res);
+  printf("%s resolution: %ld seconds, %ld nanoseconds\n", name, res.tv_sec,
+         res.tv_nsec);
+}
+
+void print_formatted_time(struct timespec *ts) {
+  char buffer[100];
+  struct tm *tm_info;
+
+  tm_info = localtime(&ts->tv_sec); // Convert time_t seconds to struct tm
+  strftime(buffer, sizeof(buffer), "%a %H:%M:%S",
+           tm_info); // Format date and time
+
+  long milliseconds =
+      ts->tv_nsec / 1000000; // Convert nanoseconds to milliseconds
+  long microseconds = (ts->tv_nsec % 1000000) / 1000; // Remaining microseconds
+  long nanoseconds = ts->tv_nsec % 1000;              // Remaining nanoseconds
+
+  printf("%s.%03ld,%03ld,%03ld\n", buffer, milliseconds, microseconds,
+         nanoseconds);
+}
+
+int main() {
+  struct timespec ts;
+  if (clock_gettime(CLOCK_REALTIME, &ts) == 0) {
+    printf("CLOCK_REALTIME:  ");
+    print_formatted_time(&ts);
+  } else {
+    perror("Failed to get CLOCK_REALTIME");
+  }
+
+  if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
+    printf("CLOCK_MONOTONIC:  %ld seconds, %ld nanoseconds\n", ts.tv_sec,
+           ts.tv_nsec);
+  } else {
+    perror("Failed to get CLOCK_MONOTONIC");
+  }
+  return 0;
+}