Add a portable tor_timercmp

We can't use the platform timercmp, because
  1) some platforms don't have them
  2) some that do have them only support certain relational operators

1 files changed, 7 insertions, 0 deletions

diff --git a/src/common/compat.h b/src/common/compat.h
index 5b6cfc40b5..2471e6b830 100644
--- a/src/common/compat.h
+++ b/src/common/compat.h
@@ -332,6 +332,13 @@ struct tm *tor_localtime_r(const time_t *timep, struct tm *result);
 struct tm *tor_gmtime_r(const time_t *timep, struct tm *result);
 #endif
 
+/** Return true iff the tvp is related to uvp according to the relational
+ * operator cmp.  Recognized values for cmp are ==, <=, <, >=, and >. */
+#define tor_timercmp(tvp, uvp, cmp)                                     \
+  (((tvp)->tv_sec == (uvp)->tv_sec) ?                                   \
+   ((tvp)->tv_usec cmp  (uvp)->tv_usec) :                               \
+   ((tvp)->tv_sec cmp  (uvp)->tv_sec))
+
 /* ===== File compatibility */
 int replace_file(const char *from, const char *to);
 int touch_file(const char *fname);