trace-cmd: Add -t to force use of TCP for live connection

Add the option -t for use with -N on record, to force the use
of TCP instead of UDP in recording the trace output. This makes
the connection more reliable at the cost of performance and
noise in the trace.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/trace-cmd.c b/trace-cmd.c
index 432523e..49110f3 100644
--- a/trace-cmd.c
+++ b/trace-cmd.c
@@ -1253,7 +1253,7 @@ void usage(char **argv)
                "usage:\n"
                " %s record [-v][-e event [-f filter]][-p plugin][-F][-d][-o file] \\\n"
                "           [-s usecs][-O option ][-l func][-g func][-n func]\n"
-               "           [-P pid][-N host:port][command ...]\n"
+               "           [-P pid][-N host:port][-t][command ...]\n"
                "          -e run command with event enabled\n"
                "          -f filter for previous -e event\n"
                "          -p run command with plugin enabled\n"
@@ -1268,6 +1268,7 @@ void usage(char **argv)
                "          -O option to enable (or disable)\n"
                "          -s sleep interval between recording (in usecs) [default: 1000]\n"
                "          -N host:port to connect to (see listen)\n"
+               "          -t used with -N, forces use of tcp in live trace\n"
                "\n"
                " %s start [-e event][-p plugin][-d][-O option ][-P pid]\n"
                "          Uses same options as record, but does not run a command.\n"
@@ -1363,7 +1364,7 @@ int main (int argc, char **argv)
                    (strcmp(argv[1], "start") == 0) ||
                    ((extract = strcmp(argv[1], "extract") == 0))) {
 
-                while ((c = getopt(argc-1, argv+1, "+he:f:Fp:do:O:s:vg:l:n:P:N:")) >= 0) {
+                while ((c = getopt(argc-1, argv+1, "+he:f:Fp:do:O:s:vg:l:n:P:N:t")) >= 0) {
                         switch (c) {
                         case 'h':
                                 usage(argv);
@@ -1463,6 +1464,9 @@ int main (int argc, char **argv)
                                         die("-N incompatible with -o");
                                 host = optarg;
                                 break;
+                        case 't':
+                                use_tcp = 1;
+                                break;
                         }
                 }