Initialize all stack variables to zero, fix uninitialized loglevel variables

[lttng-tools.git] / src / bin / lttng / commands / calibrate.c

diff --git a/src/bin/lttng/commands/calibrate.c b/src/bin/lttng/commands/calibrate.c
index a0e852f8b03984836717c4d5c5317c08d7cbb696..61b588e1294eead110e14bb5e043f0d74318b065 100644 (file)
--- a/src/bin/lttng/commands/calibrate.c
+++ b/src/bin/lttng/commands/calibrate.c
@@ -48,6 +48,7 @@ enum {
        OPT_FUNCTION_ENTRY,
        OPT_SYSCALL,
        OPT_USERSPACE,
+       OPT_LIST_OPTIONS,
 };
 
 static struct lttng_handle *handle;
@@ -75,6 +76,7 @@ static struct poptOption long_options[] = {
        {"function:entry", 0,   POPT_ARG_NONE, 0, OPT_FUNCTION_ENTRY, 0, 0},
 #endif
        {"syscall",        0,   POPT_ARG_NONE, 0, OPT_SYSCALL, 0, 0},
+       {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
        {0, 0, 0, 0, 0, 0, 0}
 };
 
@@ -86,14 +88,15 @@ static void usage(FILE *ofp)
        fprintf(ofp, "usage: lttng calibrate [options] [calibrate_options]\n");
        fprintf(ofp, "\n");
        fprintf(ofp, "  -h, --help               Show this help\n");
-       fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
+       fprintf(ofp, "      --list-options       Simple listing of options\n");
+       fprintf(ofp, "  -k, --kernel             Apply to the kernel tracer\n");
 #if 0
-       fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
-       fprintf(ofp, "                           If no CMD, the domain used is UST global\n");
-       fprintf(ofp, "                           or else the domain is UST EXEC_NAME\n");
+       fprintf(ofp, "  -u, --userspace [CMD]    Apply to the user-space tracer (domain: UST\n");
+       fprintf(ofp, "                           EXEC_NAME). If no CMD, the domain is UST global.\n";
+       fprintf(ofp, "                           (-k preempts -u)\n");
        fprintf(ofp, "  -p, --pid PID            If -u, apply to specific PID (domain: UST PID)\n");
 #else
-       fprintf(ofp, "  -u, --userspace          Apply for the user-space tracer\n");
+       fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
 #endif
        fprintf(ofp, "\n");
        fprintf(ofp, "Calibrate options:\n");
@@ -114,9 +117,9 @@ static void usage(FILE *ofp)
 }
 
 /*
- *  calibrate_lttng
+ * Calibrate LTTng.
  *
- *  Calibrate LTTng.
+ * Returns a CMD_* error.
  */
 static int calibrate_lttng(void)
 {
@@ -124,6 +127,9 @@ static int calibrate_lttng(void)
        struct lttng_domain dom;
        struct lttng_calibrate calibrate;
 
+       memset(&dom, 0, sizeof(dom));
+       memset(&calibrate, 0, sizeof(calibrate));
+
        /* Create lttng domain */
        if (opt_kernel) {
                dom.type = LTTNG_DOMAIN_KERNEL;
@@ -131,13 +137,13 @@ static int calibrate_lttng(void)
                dom.type = LTTNG_DOMAIN_UST;
        } else {
                ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
-               ret = CMD_UNDEFINED;
+               ret = CMD_ERROR;
                goto error;
        }
 
        handle = lttng_create_handle(NULL, &dom);
        if (handle == NULL) {
-               ret = -1;
+               ret = CMD_ERROR;
                goto error;
        }
 
@@ -168,6 +174,8 @@ static int calibrate_lttng(void)
                goto error;
        }
 
+       ret = CMD_SUCCESS;
+
 error:
        lttng_destroy_handle(handle);
 
@@ -175,13 +183,13 @@ error:
 }
 
 /*
- *  cmd_calibrate
+ * Calibrate LTTng tracer.
  *
- *  Calibrate LTTng tracer.
+ * Returns a CMD_* error.
  */
 int cmd_calibrate(int argc, const char **argv)
 {
-       int opt, ret;
+       int opt, ret = CMD_SUCCESS;
        static poptContext pc;
 
        pc = poptGetContext(NULL, argc, argv, long_options, 0);
@@ -193,8 +201,7 @@ int cmd_calibrate(int argc, const char **argv)
        while ((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt) {
                case OPT_HELP:
-                       usage(stderr);
-                       ret = CMD_SUCCESS;
+                       usage(stdout);
                        goto end;
                case OPT_TRACEPOINT:
                        ret = CMD_UNDEFINED;
@@ -217,6 +224,9 @@ int cmd_calibrate(int argc, const char **argv)
                case OPT_USERSPACE:
                        opt_userspace = 1;
                        break;
+               case OPT_LIST_OPTIONS:
+                       list_cmd_options(stdout, long_options);
+                       goto end;
                default:
                        usage(stderr);
                        ret = CMD_UNDEFINED;
@@ -227,5 +237,6 @@ int cmd_calibrate(int argc, const char **argv)
        ret = calibrate_lttng();
 
 end:
+       poptFreeContext(pc);
        return ret;
 }