Add: set_log_tz

base/logging.c

@@ -34,6 +34,13 @@
  */
 #define G_LOG_DOMAIN "libgvm base"
 
+/**
+ * @brief Timezone to use for logs.
+ *
+ * NULL means to use the current timezone.
+ */
+static gchar *log_tz = NULL;
+
 /**
  * @struct gvm_logging_t
  * @brief Logging stores the parameters loaded from a log configuration
@@ -69,7 +76,13 @@ get_time (gchar *time_fmt)
 {
   time_t now;
   struct tm ts;
-  gchar buf[80];
+  gchar buf[80], *original_tz;
+
+  if (log_tz) {
+    original_tz = getenv ("TZ") ? g_strdup (getenv ("TZ")) : NULL;
+    setenv ("TZ", log_tz, 1);
+    tzset ();
+  }
 
   /* Get the current time. */
   now = time (NULL);
@@ -78,6 +91,18 @@ get_time (gchar *time_fmt)
   localtime_r (&now, &ts);
   strftime (buf, sizeof (buf), time_fmt, &ts);
 
+  if (log_tz) {
+    /* Revert to stored TZ. */
+    if (original_tz)
+      {
+        setenv ("TZ", original_tz, 1);
+        g_free (original_tz);
+        tzset ();
+      }
+    else
+      unsetenv ("TZ");
+  }
+
   return g_strdup_printf ("%s", buf);
 }
 
@@ -873,6 +898,21 @@ check_log_file (gvm_logging_t *log_domain_entry)
   return 0;
 }
 
+/**
+ * @brief Set the log timezone.
+ *
+ * This is the timezone used for dates in log messages. If NULL then
+ * the current timezone is used.
+ *
+ * @param tz Timezone.
+ */
+void
+set_log_tz (const gchar *tz)
+{
+  g_free (log_tz);
+  log_tz = tz ? g_strdup (tz) : NULL;
+}
+
 /**
  * @brief Sets up routing of logdomains to log handlers.
  *

base/logging.h

@@ -54,4 +54,7 @@ get_log_reference (void);
 void
 free_log_reference (void);
 
+void
+set_log_tz (const gchar *);
+
 #endif /* not _GVM_LOGGING_H */