X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fenable_events.c;h=cdd137cc9193d3aed0efdfee037546b97c958402;hp=3e3f050d15086a1a67f57010da4e5b91d4d1030f;hb=178191b3899f114001f000c2e7f46909969f9c6f;hpb=a6de644ce2a57ee9a89caa85a270a13a88559af2 diff --git a/src/bin/lttng/commands/enable_events.c b/src/bin/lttng/commands/enable_events.c index 3e3f050d1..cdd137cc9 100644 --- a/src/bin/lttng/commands/enable_events.c +++ b/src/bin/lttng/commands/enable_events.c @@ -41,6 +41,7 @@ static char *opt_probe; static char *opt_function; static char *opt_function_entry_symbol; static char *opt_channel_name; +static char *opt_filter; #if 0 /* Not implemented yet */ static char *opt_cmd_name; @@ -58,6 +59,7 @@ enum { OPT_LOGLEVEL, OPT_LOGLEVEL_ONLY, OPT_LIST_OPTIONS, + OPT_FILTER, }; static struct lttng_handle *handle; @@ -69,13 +71,7 @@ static struct poptOption long_options[] = { {"all", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0}, {"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0}, {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0}, -#if 0 - /* Not implemented yet */ - {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0}, - {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0}, -#else {"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0}, -#endif {"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0}, {"probe", 0, POPT_ARG_STRING, &opt_probe, OPT_PROBE, 0, 0}, {"function", 0, POPT_ARG_STRING, &opt_function, OPT_FUNCTION, 0, 0}, @@ -90,6 +86,7 @@ static struct poptOption long_options[] = { {"loglevel", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL, 0, 0}, {"loglevel-only", 0, POPT_ARG_STRING, 0, OPT_LOGLEVEL_ONLY, 0, 0}, {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, + {"filter", 'f', POPT_ARG_STRING, &opt_filter, OPT_FILTER, 0, 0}, {0, 0, 0, 0, 0, 0, 0} }; @@ -98,22 +95,16 @@ static struct poptOption long_options[] = { */ static void usage(FILE *ofp) { - fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n"); + fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [-k|-u] [OPTIONS] \n"); fprintf(ofp, "\n"); + fprintf(ofp, "Options:\n"); fprintf(ofp, " -h, --help Show this help\n"); fprintf(ofp, " --list-options Simple listing of options\n"); - fprintf(ofp, " -s, --session Apply to session name\n"); - fprintf(ofp, " -c, --channel Apply to this channel\n"); + fprintf(ofp, " -s, --session NAME Apply to session name\n"); + fprintf(ofp, " -c, --channel NAME Apply to this channel\n"); fprintf(ofp, " -a, --all Enable all tracepoints and syscalls\n"); fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n"); -#if 0 - fprintf(ofp, " -u, --userspace [CMD] Apply to 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, " -p, --pid PID If -u, apply to specific PID (domain: UST PID)\n"); -#else fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n"); -#endif fprintf(ofp, "\n"); fprintf(ofp, "Event options:\n"); fprintf(ofp, " --tracepoint Tracepoint event (default)\n"); @@ -162,6 +153,29 @@ static void usage(FILE *ofp) fprintf(ofp, " TRACE_DEBUG_LINE = 13\n"); fprintf(ofp, " TRACE_DEBUG = 14\n"); fprintf(ofp, " (shortcuts such as \"system\" are allowed)\n"); + fprintf(ofp, " --filter \'expression\'\n"); + fprintf(ofp, " Filter expression on event fields,\n"); + fprintf(ofp, " event recording depends on evaluation.\n"); + fprintf(ofp, " Only specify on first activation of\n"); + fprintf(ofp, " a given event within a session.\n"); + fprintf(ofp, " Filter only allowed when enabling\n"); + fprintf(ofp, " events within a session before tracing\n"); + fprintf(ofp, " is started. If the filter fails to link\n"); + fprintf(ofp, " with the event within the traced domain,\n"); + fprintf(ofp, " the event will be discarded. Currently,\n"); + fprintf(ofp, " filter is only implemented for the user-space\n"); + fprintf(ofp, " tracer.\n"); + fprintf(ofp, " Expression examples:.\n"); + fprintf(ofp, " \n"); + fprintf(ofp, " 'intfield > 500 && intfield < 503'\n"); + fprintf(ofp, " '(stringfield == \"test\" || intfield != 10) && intfield > 33'\n"); + fprintf(ofp, " 'doublefield > 1.1 && intfield < 5.3'\n"); + fprintf(ofp, " \n"); + fprintf(ofp, " Wildcards are allowed at the end of strings:\n"); + fprintf(ofp, " 'seqfield1 == \"te*\"'\n"); + fprintf(ofp, " In string literals, the escape character is '\\'.\n"); + fprintf(ofp, " Use '\\*' for the '*' character, and '\\\\' for\n"); + fprintf(ofp, " the '\\' character.\n"); fprintf(ofp, "\n"); } @@ -287,6 +301,7 @@ int loglevel_str_to_value(const char *inputstr) static int enable_events(char *session_name) { int err, ret = CMD_SUCCESS, warn = 0; + unsigned int event_enabled = 0; char *event_name, *channel_name = NULL; struct lttng_event ev; struct lttng_domain dom; @@ -294,6 +309,14 @@ static int enable_events(char *session_name) memset(&ev, 0, sizeof(ev)); memset(&dom, 0, sizeof(dom)); + if (opt_kernel) { + if (opt_filter) { + ERR("Filter not implement for kernel tracing yet"); + ret = CMD_ERROR; + goto error; + } + } + /* Create lttng domain */ if (opt_kernel) { dom.type = LTTNG_DOMAIN_KERNEL; @@ -336,7 +359,7 @@ static int enable_events(char *session_name) ev.loglevel = loglevel_str_to_value(opt_loglevel); if (ev.loglevel == -1) { ERR("Unknown loglevel %s", opt_loglevel); - ret = -1; + ret = -LTTNG_ERR_INVALID; goto error; } } else { @@ -344,29 +367,34 @@ static int enable_events(char *session_name) } } + /* Reset flag before enabling a new event. */ + event_enabled = 0; + ret = lttng_enable_event(handle, &ev, channel_name); if (ret < 0) { switch (-ret) { - case LTTCOMM_KERN_EVENT_EXIST: + case LTTNG_ERR_KERN_EVENT_EXIST: WARN("Kernel events already enabled (channel %s, session %s)", channel_name, session_name); - goto end; + break; default: ERR("Events: %s (channel %s, session %s)", lttng_strerror(ret), channel_name, session_name); break; } + goto end; } + event_enabled = 1; switch (opt_event_type) { case LTTNG_EVENT_TRACEPOINT: if (opt_loglevel) { MSG("All %s tracepoints are enabled in channel %s for loglevel %s", - opt_kernel ? "kernel" : "UST", channel_name, - opt_loglevel); + opt_kernel ? "kernel" : "UST", channel_name, + opt_loglevel); } else { MSG("All %s tracepoints are enabled in channel %s", - opt_kernel ? "kernel" : "UST", channel_name); + opt_kernel ? "kernel" : "UST", channel_name); } break; @@ -379,11 +407,11 @@ static int enable_events(char *session_name) case LTTNG_EVENT_ALL: if (opt_loglevel) { MSG("All %s events are enabled in channel %s for loglevel %s", - opt_kernel ? "kernel" : "UST", channel_name, - opt_loglevel); + opt_kernel ? "kernel" : "UST", channel_name, + opt_loglevel); } else { MSG("All %s events are enabled in channel %s", - opt_kernel ? "kernel" : "UST", channel_name); + opt_kernel ? "kernel" : "UST", channel_name); } break; default: @@ -393,6 +421,42 @@ static int enable_events(char *session_name) */ goto error; } + if (opt_filter && event_enabled) { + ret = lttng_set_event_filter(handle, &ev, channel_name, + opt_filter); + if (ret < 0) { + fprintf(stderr, "Ret filter: %d\n", ret); + switch (-ret) { + case LTTNG_ERR_FILTER_EXIST: + WARN("Filter on events is already enabled" + " (channel %s, session %s)", + channel_name, session_name); + break; + case LTTNG_ERR_FILTER_INVAL: + case LTTNG_ERR_FILTER_NOMEM: + ERR("%s", lttng_strerror(ret)); + default: + ERR("Setting filter: '%s'", opt_filter); + /* + * The event was successfully enabled before so when + * failing to set a filter, disable the event. This has + * been discussed in bug #343 on why we do that. + */ + err = lttng_disable_event(handle, ev.name, channel_name); + if (err < 0) { + ERR("Disabling all events after filter error: %s", + lttng_strerror(err)); + } else { + WARN("All events of channel %s have been disabled due " + "to a filter error", channel_name); + } + break; + } + goto error; + } else { + MSG("Filter '%s' successfully set", opt_filter); + } + } goto end; } @@ -488,7 +552,7 @@ static int enable_events(char *session_name) ev.loglevel = loglevel_str_to_value(opt_loglevel); if (ev.loglevel == -1) { ERR("Unknown loglevel %s", opt_loglevel); - ret = -1; + ret = -LTTNG_ERR_INVALID; goto error; } } else { @@ -500,11 +564,14 @@ static int enable_events(char *session_name) goto error; } + /* Reset flag before enabling a new event. */ + event_enabled = 0; + ret = lttng_enable_event(handle, &ev, channel_name); if (ret < 0) { /* Turn ret to positive value to handle the positive error code */ switch (-ret) { - case LTTCOMM_KERN_EVENT_EXIST: + case LTTNG_ERR_KERN_EVENT_EXIST: WARN("Kernel event %s already enabled (channel %s, session %s)", event_name, channel_name, session_name); break; @@ -517,6 +584,43 @@ static int enable_events(char *session_name) } else { MSG("%s event %s created in channel %s", opt_kernel ? "kernel": "UST", event_name, channel_name); + event_enabled = 1; + } + if (opt_filter && event_enabled) { + ret = lttng_set_event_filter(handle, &ev, channel_name, + opt_filter); + if (ret < 0) { + switch (-ret) { + case LTTNG_ERR_FILTER_EXIST: + WARN("Filter on event %s is already enabled" + " (channel %s, session %s)", + event_name, channel_name, session_name); + break; + case LTTNG_ERR_FILTER_INVAL: + case LTTNG_ERR_FILTER_NOMEM: + ERR("%s", lttng_strerror(ret)); + default: + ERR("Setting filter for event %s: '%s'", ev.name, + opt_filter); + /* + * The event was successfully enabled before so when + * failing to set a filter, disable the event. This has + * been discussed in bug #343 on why we do that. + */ + err = lttng_disable_event(handle, ev.name, channel_name); + if (err < 0) { + ERR("Disabling event %s after filter error: %s", + ev.name, lttng_strerror(err)); + } else { + WARN("Event %s of channel %s has been disabled due " + "to a filter error", ev.name, channel_name); + } + break; + } + goto error; + } else { + MSG("Filter '%s' successfully set", opt_filter); + } } /* Next event */ @@ -585,6 +689,8 @@ int cmd_enable_events(int argc, const char **argv) case OPT_LIST_OPTIONS: list_cmd_options(stdout, long_options); goto end; + case OPT_FILTER: + break; default: usage(stderr); ret = CMD_UNDEFINED;