Index: support/rotatelogs.c
===================================================================
--- support/rotatelogs.c	(revision 910985)
+++ support/rotatelogs.c	(working copy)
@@ -70,7 +70,7 @@
         fprintf(stderr, "%s\n", reason);
     }
     fprintf(stderr,
-            "Usage: %s [-l] [-f] <logfile> "
+            "Usage: %s [-l] [-f] [-t] <logfile> "
             "{<rotation time in seconds>|<rotation size in megabytes>} "
             "[offset minutes from UTC]\n\n",
             argv0);
@@ -91,7 +91,10 @@
             "starts (N.B. if using a rotation time,\nthe time will always "
             "be a multiple of the rotation time, so you can synchronize\n"
             "cron scripts with it). At the end of each rotation time or "
-            "when the file size\nis reached a new log is started.\n");
+            "when the file size\nis reached a new log is started. If the "
+            "-t option is specified, the specified\nfile will be truncated "
+            "instead of rotated, and is useful where tail is used to\n"
+            "process logs in real time.\n");
     exit(1);
 }
 
@@ -122,6 +125,7 @@
     int bypass_io = 0;
     int now = 0;
     const char *szLogRoot;
+    int truncate = 0;
     apr_file_t *f_stdin, *nLogFD = NULL, *nLogFDprev = NULL;
     apr_pool_t *pool;
     apr_pool_t *pfile = NULL;
@@ -137,7 +141,7 @@
 
     apr_pool_create(&pool, NULL);
     apr_getopt_init(&opt, pool, argc, argv);
-    while ((rv = apr_getopt(opt, "lf", &c, &optarg)) == APR_SUCCESS) {
+    while ((rv = apr_getopt(opt, "lft", &c, &optarg)) == APR_SUCCESS) {
         switch (c) {
         case 'l':
             use_localtime = 1;
@@ -145,6 +149,9 @@
         case 'f':
             bypass_io = 1;
             break;
+        case 't':
+            truncate = 1;
+            break;
         }
     }
 
@@ -248,12 +255,18 @@
                 apr_strftime(buf2, &rs, sizeof(buf2), szLogRoot, &e);
             }
             else {
-                sprintf(buf2, "%s.%010d", szLogRoot, tLogStart);
+                if (truncate) {
+                    snprintf(buf2, sizeof(buf2), "%s", szLogRoot);
+                }
+                else {
+                    snprintf(buf2, sizeof(buf2), "%s.%010d", szLogRoot,
+                        tLogStart);
+                }
             }
             tLogEnd = tLogStart + tRotation;
             pfile_prev = pfile;
             apr_pool_create(&pfile, pool);
-            rv = apr_file_open(&nLogFD, buf2, APR_WRITE | APR_CREATE | APR_APPEND,
+            rv = apr_file_open(&nLogFD, buf2, APR_WRITE | APR_CREATE | APR_APPEND | (truncate ? APR_TRUNCATE : 0),
                                APR_OS_DEFAULT, pfile);
             if (rv != APR_SUCCESS) {
                 char error[120];