X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=lttng%2Fcommands%2Fenable_channels.c;h=5c9af1d9c8517b7c6e2998295e26516fb78b9590;hp=1bdf60667964ff9d75614dd1e60100b5e8b9537b;hb=5edd7e09e892604b00ca937c0f1bc887bb5a842c;hpb=7f275dfd12eb129d8c40c35b789a5853569decee diff --git a/lttng/commands/enable_channels.c b/lttng/commands/enable_channels.c index 1bdf60667..5c9af1d9c 100644 --- a/lttng/commands/enable_channels.c +++ b/lttng/commands/enable_channels.c @@ -31,11 +31,12 @@ #include "../utils.h" static char *opt_channels; -static char *opt_kernel; +static int opt_kernel; static char *opt_cmd_name; static char *opt_session_name; static int opt_pid_all; static int opt_userspace; +static char *opt_cmd_name; static pid_t opt_pid; static struct lttng_channel chan; @@ -50,12 +51,14 @@ enum { OPT_USERSPACE, }; +static struct lttng_handle *handle; + static struct poptOption long_options[] = { /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, {"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0}, {"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0}, - {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0}, + {"userspace", 'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0}, {"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0}, {"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0}, {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0}, @@ -82,64 +85,105 @@ static void usage(FILE *ofp) fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n"); fprintf(ofp, "\n"); fprintf(ofp, "Channel options:\n"); - fprintf(ofp, " --discard Discard event when buffers are full (default)\n"); - fprintf(ofp, " --overwrite Flight recorder mode\n"); - fprintf(ofp, " --subbuf-size Subbuffer size in bytes (default: 4096)\n"); - fprintf(ofp, " --num-subbuf Number of subbufers (default: 2)\n"); - fprintf(ofp, " --switch-timer Switch timer interval in usec (default: 0)\n"); - fprintf(ofp, " --read-timer Read timer interval in usec (default: 200)\n"); + fprintf(ofp, " --discard Discard event when buffers are full%s\n", + DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)"); + fprintf(ofp, " --overwrite Flight recorder mode%s\n", + DEFAULT_CHANNEL_OVERWRITE ? " (default)" : ""); + fprintf(ofp, " --subbuf-size Subbuffer size in bytes\n"); + fprintf(ofp, " (default: %u, kernel default: %u)\n", + DEFAULT_CHANNEL_SUBBUF_SIZE, + DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE); + fprintf(ofp, " --num-subbuf Number of subbufers\n"); + fprintf(ofp, " (default: %u, kernel default: %u)\n", + DEFAULT_CHANNEL_SUBBUF_NUM, + DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM); + fprintf(ofp, " --switch-timer Switch timer interval in usec (default: %u)\n", + DEFAULT_CHANNEL_SWITCH_TIMER); + fprintf(ofp, " --read-timer Read timer interval in usec (default: %u)\n", + DEFAULT_CHANNEL_READ_TIMER); fprintf(ofp, "\n"); } /* - * enable_channel - * - * Adding channel using the lttng API. + * Set default attributes depending on those already defined from the command + * line. */ -static int enable_channel(void) +static void set_default_attr(struct lttng_domain *dom) +{ + struct lttng_channel_attr default_attr; + + /* Set attributes */ + lttng_channel_set_default_attr(dom, &default_attr); + + if (chan.attr.overwrite == -1) { + chan.attr.overwrite = default_attr.overwrite; + } + if (chan.attr.subbuf_size == -1) { + chan.attr.subbuf_size = default_attr.subbuf_size; + } + if (chan.attr.num_subbuf == -1) { + chan.attr.num_subbuf = default_attr.num_subbuf; + } + if (chan.attr.switch_timer_interval == -1) { + chan.attr.switch_timer_interval = default_attr.switch_timer_interval; + } + if (chan.attr.read_timer_interval == -1) { + chan.attr.read_timer_interval = default_attr.read_timer_interval; + } + if (chan.attr.output == -1) { + chan.attr.output = default_attr.output; + } +} + +/* + * Adding channel using the lttng API. + */ +static int enable_channel(char *session_name) { int ret = CMD_SUCCESS; char *channel_name; struct lttng_domain dom; - if (set_session_name(opt_session_name) < 0) { - ret = CMD_ERROR; + if (opt_kernel) { + dom.type = LTTNG_DOMAIN_KERNEL; + } else if (opt_pid != 0) { + dom.type = LTTNG_DOMAIN_UST_PID; + dom.attr.pid = opt_pid; + DBG("PID %d set to lttng handle", opt_pid); + } else if (opt_userspace && opt_cmd_name == NULL) { + dom.type = LTTNG_DOMAIN_UST; + } else if (opt_userspace && opt_cmd_name != NULL) { + dom.type = LTTNG_DOMAIN_UST_EXEC_NAME; + strncpy(dom.attr.exec_name, opt_cmd_name, NAME_MAX); + } else { + ERR("Please specify a tracer (--kernel or --userspace)"); + ret = CMD_NOT_IMPLEMENTED; goto error; } - if (opt_kernel) { - dom.type = LTTNG_DOMAIN_KERNEL; + set_default_attr(&dom); + + handle = lttng_create_handle(session_name, &dom); + if (handle == NULL) { + ret = -1; + goto error; } - /* Strip event list */ + /* Strip channel list (format: chan1,chan2,...) */ channel_name = strtok(opt_channels, ","); while (channel_name != NULL) { - /* Kernel tracer action */ - if (opt_kernel) { - DBG("Enabling kernel channel %s", channel_name); - - /* Copy channel name and normalize it */ - strncpy(chan.name, channel_name, NAME_MAX); - chan.name[NAME_MAX - 1] = '\0'; - - ret = lttng_enable_channel(&dom, &chan); - if (ret < 0) { - goto error; - } else { - MSG("Kernel channel enabled %s", channel_name); - } - } else if (opt_userspace) { /* User-space tracer action */ - /* - * TODO: Waiting on lttng UST 2.0 - */ - if (opt_pid_all) { - } else if (opt_pid != 0) { - } - ret = CMD_NOT_IMPLEMENTED; + /* Copy channel name and normalize it */ + strncpy(chan.name, channel_name, NAME_MAX); + chan.name[NAME_MAX - 1] = '\0'; + + DBG("Enabling channel %s", channel_name); + + ret = lttng_enable_channel(handle, &chan); + if (ret < 0) { goto error; } else { - ERR("Please specify a tracer (--kernel or --userspace)"); - goto error; + MSG("Channel enabled %s for session %s", + channel_name, session_name); } /* Next event */ @@ -147,31 +191,31 @@ static int enable_channel(void) } error: + lttng_destroy_handle(handle); + return ret; } /* - * init_channel_config - * - * Default value for channel configuration. + * Default value for channel configuration. */ static void init_channel_config(void) { - chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; - chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE; - chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM; - chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; - chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; - chan.attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; + /* + * Put -1 everywhere so we can identify those set by the command line and + * those needed to be set by the default values. + */ + memset(&chan.attr, -1, sizeof(chan.attr)); } /* - * Add channel to trace session + * Add channel to trace session */ int cmd_enable_channels(int argc, const char **argv) { int opt, ret; static poptContext pc; + char *session_name = NULL; init_channel_config(); @@ -184,10 +228,6 @@ int cmd_enable_channels(int argc, const char **argv) usage(stderr); ret = CMD_SUCCESS; goto end; - case OPT_USERSPACE: - opt_userspace = 1; - opt_cmd_name = poptGetOptArg(pc); - break; case OPT_DISCARD: chan.attr.overwrite = 0; DBG("Channel set to discard"); @@ -212,6 +252,9 @@ int cmd_enable_channels(int argc, const char **argv) chan.attr.read_timer_interval = atoi(poptGetOptArg(pc)); DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval); break; + case OPT_USERSPACE: + opt_userspace = 1; + break; default: usage(stderr); ret = CMD_UNDEFINED; @@ -227,7 +270,17 @@ int cmd_enable_channels(int argc, const char **argv) goto end; } - ret = enable_channel(); + if (!opt_session_name) { + session_name = get_session_name(); + if (session_name == NULL) { + ret = -1; + goto end; + } + } else { + session_name = opt_session_name; + } + + ret = enable_channel(session_name); end: return ret;