Improve error handling of lttng cli

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

diff --git a/src/bin/lttng/commands/list.c b/src/bin/lttng/commands/list.c
index f09edaef474ce76660fd67aad1867d42bc7b4550..4def4e7a2ee3aa050599a661aeb162d5c2d179cb 100644 (file)
--- a/src/bin/lttng/commands/list.c
+++ b/src/bin/lttng/commands/list.c
@@ -43,6 +43,7 @@ const char *indent8 = "        ";
 enum {
        OPT_HELP = 1,
        OPT_USERSPACE,
+       OPT_LIST_OPTIONS,
 };
 
 static struct lttng_handle *handle;
@@ -60,6 +61,7 @@ static struct poptOption long_options[] = {
 #endif
        {"channel",   'c', POPT_ARG_STRING, &opt_channel, 0, 0, 0},
        {"domain",    'd', POPT_ARG_VAL, &opt_domain, 1, 0, 0},
+       {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
        {0, 0, 0, 0, 0, 0, 0}
 };
 
@@ -68,7 +70,7 @@ static struct poptOption long_options[] = {
  */
 static void usage(FILE *ofp)
 {
-       fprintf(ofp, "usage: lttng list [[-k] [-u] [-p PID] [SESSION [<options>]]]\n");
+       fprintf(ofp, "usage: lttng list [SESSION [<OPTIONS>]]\n");
        fprintf(ofp, "\n");
        fprintf(ofp, "With no arguments, list available tracing session(s)\n");
        fprintf(ofp, "\n");
@@ -76,6 +78,7 @@ static void usage(FILE *ofp)
        fprintf(ofp, "With -u alone, list available userspace events\n");
        fprintf(ofp, "\n");
        fprintf(ofp, "  -h, --help              Show this help\n");
+       fprintf(ofp, "      --list-options       Simple listing of options\n");
        fprintf(ofp, "  -k, --kernel            Select kernel domain\n");
        fprintf(ofp, "  -u, --userspace         Select user-space domain.\n");
 #if 0
@@ -176,8 +179,9 @@ static void print_events(struct lttng_event *event)
 
                        ret = snprintf(ll_value, LTTNG_SYMBOL_NAME_LEN,
                                " (%lld)", (long long) event->loglevel_value);
-                       if (ret < 0)
+                       if (ret < 0) {
                                ERR("snprintf error");
+                       }
                }
                MSG("%s%s%s%s%s%s (type: tracepoint)%s", indent6,
                                event->name,
@@ -212,11 +216,6 @@ static void print_events(struct lttng_event *event)
                MSG("%s (type: noop)%s", indent6,
                                enabled_string(event->enabled));
                break;
-       case LTTNG_EVENT_TRACEPOINT_LOGLEVEL:
-               MSG("%s%s (type: tracepoint loglevel)%s", indent6,
-                       event->name,
-                       enabled_string(event->enabled));
-               break;
        case LTTNG_EVENT_ALL:
                /* We should never have "all" events in list. */
                assert(0);
@@ -390,10 +389,10 @@ static int list_channels(const char *channel_name)
        count = lttng_list_channels(handle, &channels);
        if (count < 0) {
                ret = count;
-               goto error;
+               goto error_channels;
        } else if (count == 0) {
-               MSG("No channel found");
-               goto end;
+               ERR("Channel %s not found", channel_name);
+               goto error;
        }
 
        if (channel_name == NULL) {
@@ -422,14 +421,16 @@ static int list_channels(const char *channel_name)
        }
 
        if (!chan_found && channel_name != NULL) {
-               MSG("Channel %s not found", channel_name);
+               ERR("Channel %s not found", channel_name);
+               goto error;
        }
 
-end:
-       free(channels);
        ret = CMD_SUCCESS;
 
 error:
+       free(channels);
+
+error_channels:
        return ret;
 }
 
@@ -476,7 +477,7 @@ static int list_sessions(const char *session_name)
        free(sessions);
 
        if (!session_found && session_name != NULL) {
-               MSG("Session %s not found", session_name);
+               ERR("Session %s not found", session_name);
        }
 
        if (session_name == NULL) {
@@ -542,6 +543,7 @@ int cmd_list(int argc, const char **argv)
 
        if (argc < 1) {
                usage(stderr);
+               ret = CMD_ERROR;
                goto end;
        }
 
@@ -551,11 +553,14 @@ int cmd_list(int argc, const char **argv)
        while ((opt = poptGetNextOpt(pc)) != -1) {
                switch (opt) {
                case OPT_HELP:
-                       usage(stderr);
+                       usage(stdout);
                        goto end;
                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;
@@ -576,6 +581,7 @@ int cmd_list(int argc, const char **argv)
 
        handle = lttng_create_handle(session_name, &domain);
        if (handle == NULL) {
+               ret = CMD_FATAL;
                goto end;
        }
 
@@ -583,18 +589,21 @@ int cmd_list(int argc, const char **argv)
                if (!opt_kernel && !opt_userspace) {
                        ret = list_sessions(NULL);
                        if (ret < 0) {
+                               ret = CMD_ERROR;
                                goto end;
                        }
                }
                if (opt_kernel) {
                        ret = list_kernel_events();
                        if (ret < 0) {
+                               ret = CMD_ERROR;
                                goto end;
                        }
                }
                if (opt_userspace) {
                        ret = list_ust_events();
                        if (ret < 0) {
+                               ret = CMD_ERROR;
                                goto end;
                        }
                }
@@ -602,12 +611,16 @@ int cmd_list(int argc, const char **argv)
                /* List session attributes */
                ret = list_sessions(session_name);
                if (ret < 0) {
+                       ret = CMD_ERROR;
                        goto end;
                }
 
                /* Domain listing */
                if (opt_domain) {
                        ret = list_domains(session_name);
+                       if (ret < 0) {
+                               ret = CMD_ERROR;
+                       }
                        goto end;
                }
 
@@ -615,13 +628,14 @@ int cmd_list(int argc, const char **argv)
                        /* Channel listing */
                        ret = list_channels(opt_channel);
                        if (ret < 0) {
+                               ret = CMD_ERROR;
                                goto end;
                        }
                } else {
                        /* We want all domain(s) */
                        nb_domain = lttng_list_domains(session_name, &domains);
                        if (nb_domain < 0) {
-                               ret = nb_domain;
+                               ret = CMD_ERROR;
                                goto end;
                        }
 
@@ -643,11 +657,13 @@ int cmd_list(int argc, const char **argv)
 
                                handle = lttng_create_handle(session_name, &domains[i]);
                                if (handle == NULL) {
+                                       ret = CMD_FATAL;
                                        goto end;
                                }
 
                                ret = list_channels(opt_channel);
                                if (ret < 0) {
+                                       ret = CMD_ERROR;
                                        goto end;
                                }
                        }
@@ -660,5 +676,6 @@ end:
        }
        lttng_destroy_handle(handle);
 
+       poptFreeContext(pc);
        return ret;
 }