trace control finished

[lttv.git] / ltt / branches / poly / lttctl / lttctl.c

diff --git a/ltt/branches/poly/lttctl/lttctl.c b/ltt/branches/poly/lttctl/lttctl.c
index 19605c2e55888f86cf6cef78db4bce75058ff168..679936c1e3a7ced259d54f8c1ec31f4394930ce2 100644 (file)
--- a/ltt/branches/poly/lttctl/lttctl.c
+++ b/ltt/branches/poly/lttctl/lttctl.c
@@ -43,6 +43,7 @@ static char *trace_name = NULL;
 static char *mode_name = NULL;
 static unsigned subbuf_size = 0;
 static unsigned n_subbufs = 0;
+static unsigned append_trace = 0;
 static enum trace_mode mode = LTT_TRACE_NORMAL;
 static enum trace_ctl_op op = CTL_OP_NONE;
 static char *channel_root = NULL;
@@ -83,6 +84,7 @@ void show_arguments(void)
        printf("-z            Size of the subbuffers (will be rounded to next page size)\n");
        printf("-x            Number of subbuffers\n");
        printf("-e            Get XML facilities description\n");
+       printf("-a            Append to trace\n");
        printf("\n");
 }
 
@@ -203,6 +205,9 @@ int parse_arguments(int argc, char **argv)
                                                        ret = -1;
                                                }
                                                break;
+          case 'a':
+            append_trace = 1;
+            break;
                                        default:
                                                printf("Invalid argument '%s'.\n", argv[argn]);
                                                printf("\n");
@@ -288,7 +293,7 @@ int create_eventdefs(void)
   strncat(eventdefs_path, "/eventdefs/", PATH_MAX - trace_root_len);
   size_t eventdefs_path_len = strlen(eventdefs_path);
   ret = mkdir(eventdefs_path, S_IRWXU|S_IRWXG|S_IRWXO);
-  if(ret == -1 && errno != EEXIST) {
+  if(ret == -1 && (!append_trace || errno != EEXIST)) {
     perror("Cannot create eventdefs directory");
     goto error;
   }
@@ -398,9 +403,13 @@ int lttctl_daemon(struct lttctl_handle *handle, char *trace_name)
 
        } else if(pid == 0) {
                /* child */
-    
-               int ret =       execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
-                     channel_path, "-d", NULL);
+    int ret;
+    if(append_trace) 
+               ret =   execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
+                       channel_path, "-d", "-a", NULL);
+    else
+               ret =   execlp(lttd_path, lttd_path, "-t", trace_root, "-c",
+                       channel_path, "-d", NULL);
                if(ret) {
                        perror("Error in executing the lttd daemon");
                        exit(-1);