--- /dev/null
+/*
+ * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ */
+
+#define _LGPL_SOURCE
+#include <popt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <ctype.h>
+
+#include <common/sessiond-comm/sessiond-comm.h>
+#include <common/utils.h>
+#include <common/mi-lttng.h>
+
+#include <lttng/domain-internal.h>
+
+#include "../command.h"
+#include "../utils.h"
+
+
+static struct lttng_channel chan_opts;
+static char *opt_channels;
+static int opt_kernel;
+static char *opt_session_name;
+static int opt_userspace;
+static char *opt_output;
+static int opt_buffer_uid;
+static int opt_buffer_pid;
+static int opt_buffer_global;
+static struct {
+ bool set;
+ uint64_t interval;
+} opt_monitor_timer;
+static struct {
+ bool set;
+ int64_t value;
+} opt_blocking_timeout;
+
+static struct mi_writer *writer;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-enable-channel.1.h>
+;
+#endif
+
+enum {
+ OPT_HELP = 1,
+ OPT_DISCARD,
+ OPT_OVERWRITE,
+ OPT_SUBBUF_SIZE,
+ OPT_NUM_SUBBUF,
+ OPT_SWITCH_TIMER,
+ OPT_MONITOR_TIMER,
+ OPT_READ_TIMER,
+ OPT_USERSPACE,
+ OPT_LIST_OPTIONS,
+ OPT_TRACEFILE_SIZE,
+ OPT_TRACEFILE_COUNT,
+ OPT_BLOCKING_TIMEOUT,
+};
+
+static struct lttng_handle *handle;
+
+const char *output_mmap = "mmap";
+const char *output_splice = "splice";
+
+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_NONE, 0, OPT_USERSPACE, 0, 0},
+ {"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
+ {"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
+ {"subbuf-size", 0, POPT_ARG_STRING, 0, OPT_SUBBUF_SIZE, 0, 0},
+ {"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
+ {"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
+ {"monitor-timer", 0, POPT_ARG_INT, 0, OPT_MONITOR_TIMER, 0, 0},
+ {"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
+ {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+ {"output", 0, POPT_ARG_STRING, &opt_output, 0, 0, 0},
+ {"buffers-uid", 0, POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0},
+ {"buffers-pid", 0, POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0},
+ {"buffers-global", 0, POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
+ {"tracefile-size", 'C', POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
+ {"tracefile-count", 'W', POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
+ {"blocking-timeout", 0, POPT_ARG_INT, 0, OPT_BLOCKING_TIMEOUT, 0, 0},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+
+/*
+ * Set default attributes depending on those already defined from the command
+ * line.
+ */
+static void set_default_attr(struct lttng_domain *dom)
+{
+ struct lttng_channel_attr default_attr;
+
+ memset(&default_attr, 0, sizeof(default_attr));
+
+ /* Set attributes */
+ lttng_channel_set_default_attr(dom, &default_attr);
+
+ if (chan_opts.attr.overwrite == -1) {
+ chan_opts.attr.overwrite = default_attr.overwrite;
+ }
+ if (chan_opts.attr.subbuf_size == -1) {
+ chan_opts.attr.subbuf_size = default_attr.subbuf_size;
+ }
+ if (chan_opts.attr.num_subbuf == -1) {
+ chan_opts.attr.num_subbuf = default_attr.num_subbuf;
+ }
+ if (chan_opts.attr.switch_timer_interval == -1) {
+ chan_opts.attr.switch_timer_interval = default_attr.switch_timer_interval;
+ }
+ if (chan_opts.attr.read_timer_interval == -1) {
+ chan_opts.attr.read_timer_interval = default_attr.read_timer_interval;
+ }
+ if ((int) chan_opts.attr.output == -1) {
+ chan_opts.attr.output = default_attr.output;
+ }
+ if (chan_opts.attr.tracefile_count == -1) {
+ chan_opts.attr.tracefile_count = default_attr.tracefile_count;
+ }
+ if (chan_opts.attr.tracefile_size == -1) {
+ chan_opts.attr.tracefile_size = default_attr.tracefile_size;
+ }
+}
+
+/*
+ * Adding channel using the lttng API.
+ */
+static int enable_channel(char *session_name)
+{
+ struct lttng_channel *channel = NULL;
+ int ret = CMD_SUCCESS, warn = 0, error = 0, success = 0;
+ char *channel_name;
+ struct lttng_domain dom;
+
+ memset(&dom, 0, sizeof(dom));
+
+ /* Validate options. */
+ if (opt_kernel) {
+ if (opt_blocking_timeout.set) {
+ ERR("Retry timeout option not supported for kernel domain (-k)");
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ /* Create lttng domain */
+ if (opt_kernel) {
+ dom.type = LTTNG_DOMAIN_KERNEL;
+ dom.buf_type = LTTNG_BUFFER_GLOBAL;
+ if (opt_buffer_uid || opt_buffer_pid) {
+ ERR("Buffer type not supported for domain -k");
+ ret = CMD_ERROR;
+ goto error;
+ }
+ } else if (opt_userspace) {
+ dom.type = LTTNG_DOMAIN_UST;
+ if (opt_buffer_pid) {
+ dom.buf_type = LTTNG_BUFFER_PER_PID;
+ } else {
+ if (opt_buffer_global) {
+ ERR("Buffer type not supported for domain -u");
+ ret = CMD_ERROR;
+ goto error;
+ }
+ dom.buf_type = LTTNG_BUFFER_PER_UID;
+ }
+ } else {
+ /* Checked by the caller. */
+ abort();
+ }
+
+ set_default_attr(&dom);
+
+ if (chan_opts.attr.tracefile_size == 0 && chan_opts.attr.tracefile_count) {
+ ERR("Missing option --tracefile-size. "
+ "A file count without a size won't do anything.");
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ if ((chan_opts.attr.tracefile_size > 0) &&
+ (chan_opts.attr.tracefile_size < chan_opts.attr.subbuf_size)) {
+ WARN("Tracefile size rounded up from (%" PRIu64 ") to subbuffer size (%" PRIu64 ")",
+ chan_opts.attr.tracefile_size, chan_opts.attr.subbuf_size);
+ chan_opts.attr.tracefile_size = chan_opts.attr.subbuf_size;
+ }
+
+ /* Setting channel output */
+ if (opt_output) {
+ if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) {
+ chan_opts.attr.output = LTTNG_EVENT_MMAP;
+ } else if (!strncmp(output_splice, opt_output, strlen(output_splice))) {
+ chan_opts.attr.output = LTTNG_EVENT_SPLICE;
+ } else {
+ ERR("Unknown output type %s. Possible values are: %s, %s\n",
+ opt_output, output_mmap, output_splice);
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ handle = lttng_create_handle(session_name, &dom);
+ if (handle == NULL) {
+ ret = -1;
+ goto error;
+ }
+
+ /* Mi open channels element */
+ if (lttng_opt_mi) {
+ LTTNG_ASSERT(writer);
+ ret = mi_lttng_channels_open(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ /* Strip channel list (format: chan1,chan2,...) */
+ channel_name = strtok(opt_channels, ",");
+ while (channel_name != NULL) {
+ void *extended_ptr;
+
+ /* Validate channel name's length */
+ if (strlen(channel_name) >= sizeof(chan_opts.name)) {
+ ERR("Channel name is too long (max. %zu characters)",
+ sizeof(chan_opts.name) - 1);
+ error = 1;
+ goto skip_enable;
+ }
+
+ /*
+ * A dynamically-allocated channel is used in order to allow
+ * the configuration of extended attributes (post-2.9).
+ */
+ channel = lttng_channel_create(&dom);
+ if (!channel) {
+ ERR("Unable to create channel object");
+ error = 1;
+ goto error;
+ }
+
+ /* Copy channel name */
+ strcpy(channel->name, channel_name);
+ channel->enabled = 1;
+ extended_ptr = channel->attr.extended.ptr;
+ memcpy(&channel->attr, &chan_opts.attr, sizeof(chan_opts.attr));
+ channel->attr.extended.ptr = extended_ptr;
+ if (opt_monitor_timer.set) {
+ ret = lttng_channel_set_monitor_timer_interval(channel,
+ opt_monitor_timer.interval);
+ if (ret) {
+ ERR("Failed to set the channel's monitor timer interval");
+ error = 1;
+ goto error;
+ }
+ }
+ if (opt_blocking_timeout.set) {
+ ret = lttng_channel_set_blocking_timeout(channel,
+ opt_blocking_timeout.value);
+ if (ret) {
+ ERR("Failed to set the channel's blocking timeout");
+ error = 1;
+ goto error;
+ }
+ }
+
+ DBG("Enabling channel %s", channel_name);
+
+ ret = lttng_enable_channel(handle, channel);
+ if (ret < 0) {
+ success = 0;
+ switch (-ret) {
+ case LTTNG_ERR_KERN_CHAN_EXIST:
+ case LTTNG_ERR_UST_CHAN_EXIST:
+ case LTTNG_ERR_CHAN_EXIST:
+ WARN("Channel %s: %s (session %s)", channel_name,
+ lttng_strerror(ret), session_name);
+ warn = 1;
+ break;
+ case LTTNG_ERR_INVALID_CHANNEL_NAME:
+ ERR("Invalid channel name: \"%s\". "
+ "Channel names may not start with '.', and "
+ "may not contain '/'.", channel_name);
+ error = 1;
+ break;
+ default:
+ ERR("Channel %s: %s (session %s)", channel_name,
+ lttng_strerror(ret), session_name);
+ error = 1;
+ break;
+ }
+ } else {
+ MSG("%s channel %s enabled for session %s",
+ lttng_domain_type_str(dom.type),
+ channel_name, session_name);
+ success = 1;
+ }
+
+skip_enable:
+ if (lttng_opt_mi) {
+ /* Mi print the channel element and leave it open */
+ ret = mi_lttng_channel(writer, channel, 1);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ /* Individual Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_command_success, success);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ /* Close channel element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ /* Next channel */
+ channel_name = strtok(NULL, ",");
+ lttng_channel_destroy(channel);
+ channel = NULL;
+ }
+
+ if (lttng_opt_mi) {
+ /* Close channels element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ ret = CMD_SUCCESS;
+
+error:
+ if (channel) {
+ lttng_channel_destroy(channel);
+ }
+ /* If more important error happen bypass the warning */
+ if (!ret && warn) {
+ ret = CMD_WARNING;
+ }
+ /* If more important error happen bypass the warning */
+ if (!ret && error) {
+ ret = CMD_ERROR;
+ }
+
+ lttng_destroy_handle(handle);
+
+ return ret;
+}
+
+/*
+ * Default value for channel configuration.
+ */
+static void init_channel_config(void)
+{
+ /*
+ * 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_opts.attr, -1, sizeof(chan_opts.attr));
+ chan_opts.attr.extended.ptr = NULL;
+}
+
+/*
+ * Add channel to trace session
+ */
+int cmd_enable_channels(int argc, const char **argv)
+{
+ int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
+ static poptContext pc;
+ char *session_name = NULL;
+ char *opt_arg = NULL;
+ const char *leftover = NULL;
+
+ init_channel_config();
+
+ pc = poptGetContext(NULL, argc, argv, long_options, 0);
+ poptReadDefaultConfig(pc, 0);
+
+ while ((opt = poptGetNextOpt(pc)) != -1) {
+ switch (opt) {
+ case OPT_HELP:
+ SHOW_HELP();
+ goto end;
+ case OPT_DISCARD:
+ chan_opts.attr.overwrite = 0;
+ DBG("Channel set to discard");
+ break;
+ case OPT_OVERWRITE:
+ chan_opts.attr.overwrite = 1;
+ DBG("Channel set to overwrite");
+ break;
+ case OPT_SUBBUF_SIZE:
+ {
+ uint64_t rounded_size;
+ int order;
+
+ /* Parse the size */
+ opt_arg = poptGetOptArg(pc);
+ if (utils_parse_size_suffix(opt_arg, &chan_opts.attr.subbuf_size) < 0 || !chan_opts.attr.subbuf_size) {
+ ERR("Wrong value in --subbuf-size parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ order = get_count_order_u64(chan_opts.attr.subbuf_size);
+ LTTNG_ASSERT(order >= 0);
+ rounded_size = 1ULL << order;
+ if (rounded_size < chan_opts.attr.subbuf_size) {
+ ERR("The subbuf size (%" PRIu64 ") is rounded and overflows!",
+ chan_opts.attr.subbuf_size);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (rounded_size != chan_opts.attr.subbuf_size) {
+ WARN("The subbuf size (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
+ chan_opts.attr.subbuf_size, rounded_size);
+ chan_opts.attr.subbuf_size = rounded_size;
+ }
+
+ /* Should now be power of 2 */
+ LTTNG_ASSERT(!((chan_opts.attr.subbuf_size - 1) & chan_opts.attr.subbuf_size));
+
+ DBG("Channel subbuf size set to %" PRIu64, chan_opts.attr.subbuf_size);
+ break;
+ }
+ case OPT_NUM_SUBBUF:
+ {
+ uint64_t rounded_size;
+ int order;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+ chan_opts.attr.num_subbuf = strtoull(opt_arg, NULL, 0);
+ if (errno != 0 || !chan_opts.attr.num_subbuf || !isdigit(opt_arg[0])) {
+ ERR("Wrong value in --num-subbuf parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ order = get_count_order_u64(chan_opts.attr.num_subbuf);
+ LTTNG_ASSERT(order >= 0);
+ rounded_size = 1ULL << order;
+ if (rounded_size < chan_opts.attr.num_subbuf) {
+ ERR("The number of subbuffers (%" PRIu64 ") is rounded and overflows!",
+ chan_opts.attr.num_subbuf);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (rounded_size != chan_opts.attr.num_subbuf) {
+ WARN("The number of subbuffers (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
+ chan_opts.attr.num_subbuf, rounded_size);
+ chan_opts.attr.num_subbuf = rounded_size;
+ }
+
+ /* Should now be power of 2 */
+ LTTNG_ASSERT(!((chan_opts.attr.num_subbuf - 1) & chan_opts.attr.num_subbuf));
+
+ DBG("Channel subbuf num set to %" PRIu64, chan_opts.attr.num_subbuf);
+ break;
+ }
+ case OPT_SWITCH_TIMER:
+ {
+ uint64_t v;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+
+ if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+ ERR("Wrong value for --switch-timer parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (v != (uint32_t) v) {
+ ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ chan_opts.attr.switch_timer_interval = (uint32_t) v;
+ DBG("Channel switch timer interval set to %d %s",
+ chan_opts.attr.switch_timer_interval,
+ USEC_UNIT);
+ break;
+ }
+ case OPT_READ_TIMER:
+ {
+ uint64_t v;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+
+ if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+ ERR("Wrong value for --read-timer parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (v != (uint32_t) v) {
+ ERR("32-bit overflow in --read-timer parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ chan_opts.attr.read_timer_interval = (uint32_t) v;
+ DBG("Channel read timer interval set to %d %s",
+ chan_opts.attr.read_timer_interval,
+ USEC_UNIT);
+ break;
+ }
+ case OPT_MONITOR_TIMER:
+ {
+ uint64_t v;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+
+ if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+ ERR("Wrong value for --monitor-timer parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ opt_monitor_timer.interval = (uint64_t) v;
+ opt_monitor_timer.set = true;
+ DBG("Channel monitor timer interval set to %" PRIu64 " %s",
+ opt_monitor_timer.interval,
+ USEC_UNIT);
+ break;
+ }
+ case OPT_BLOCKING_TIMEOUT:
+ {
+ uint64_t v;
+ long long v_msec;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+
+ if (strcmp(opt_arg, "inf") == 0) {
+ opt_blocking_timeout.value = (int64_t) -1;
+ opt_blocking_timeout.set = true;
+ DBG("Channel blocking timeout set to infinity");
+ break;
+ }
+
+ if (utils_parse_time_suffix(opt_arg, &v) < 0) {
+ ERR("Wrong value for --blocking-timeout parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /*
+ * While LTTng-UST and LTTng-tools will accept a
+ * blocking timeout expressed in µs, the current
+ * tracer implementation relies on poll() which
+ * takes an "int timeout" parameter expressed in
+ * msec.
+ *
+ * Since the error reporting from the tracer is
+ * not precise, we perform this check here to
+ * provide a helpful error message in case of
+ * overflow.
+ *
+ * The setter (liblttng-ctl) also performs an
+ * equivalent check.
+ */
+ v_msec = v / 1000;
+ if (v_msec != (int32_t) v_msec) {
+ ERR("32-bit milliseconds overflow in --blocking-timeout parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ opt_blocking_timeout.value = (int64_t) v;
+ opt_blocking_timeout.set = true;
+ DBG("Channel blocking timeout set to %" PRId64 " %s%s",
+ opt_blocking_timeout.value,
+ USEC_UNIT,
+ opt_blocking_timeout.value == 0 ?
+ " (non-blocking)" : "");
+ break;
+ }
+ case OPT_USERSPACE:
+ opt_userspace = 1;
+ break;
+ case OPT_TRACEFILE_SIZE:
+ opt_arg = poptGetOptArg(pc);
+ if (utils_parse_size_suffix(opt_arg, &chan_opts.attr.tracefile_size) < 0) {
+ ERR("Wrong value in --tracefile-size parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ DBG("Maximum tracefile size set to %" PRIu64,
+ chan_opts.attr.tracefile_size);
+ break;
+ case OPT_TRACEFILE_COUNT:
+ {
+ unsigned long v;
+
+ errno = 0;
+ opt_arg = poptGetOptArg(pc);
+ v = strtoul(opt_arg, NULL, 0);
+ if (errno != 0 || !isdigit(opt_arg[0])) {
+ ERR("Wrong value in --tracefile-count parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ if (v != (uint32_t) v) {
+ ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg);
+ ret = CMD_ERROR;
+ goto end;
+ }
+ chan_opts.attr.tracefile_count = (uint32_t) v;
+ DBG("Maximum tracefile count set to %" PRIu64,
+ chan_opts.attr.tracefile_count);
+ break;
+ }
+ case OPT_LIST_OPTIONS:
+ list_cmd_options(stdout, long_options);
+ goto end;
+ default:
+ ret = CMD_UNDEFINED;
+ goto end;
+ }
+ }
+
+ ret = print_missing_or_multiple_domains(
+ opt_kernel + opt_userspace, false);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (chan_opts.attr.overwrite == 1 && opt_blocking_timeout.set &&
+ opt_blocking_timeout.value != 0) {
+ ERR("You cannot specify --overwrite and --blocking-timeout=N, "
+ "where N is different than 0");
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Mi check */
+ if (lttng_opt_mi) {
+ writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
+ if (!writer) {
+ ret = -LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ /* Open command element */
+ ret = mi_lttng_writer_command_open(writer,
+ mi_lttng_element_command_enable_channels);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Open output element */
+ ret = mi_lttng_writer_open_element(writer,
+ mi_lttng_element_command_output);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ }
+
+ opt_channels = (char*) poptGetArg(pc);
+ if (opt_channels == NULL) {
+ ERR("Missing channel name.\n");
+ ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+
+ leftover = poptGetArg(pc);
+ if (leftover) {
+ ERR("Unknown argument: %s", leftover);
+ ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+
+ if (!opt_session_name) {
+ session_name = get_session_name();
+ if (session_name == NULL) {
+ command_ret = CMD_ERROR;
+ success = 0;
+ goto mi_closing;
+ }
+ } else {
+ session_name = opt_session_name;
+ }
+
+ command_ret = enable_channel(session_name);
+ if (command_ret) {
+ success = 0;
+ }
+
+mi_closing:
+ /* Mi closing */
+ if (lttng_opt_mi) {
+ /* Close output element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ goto end;
+ }
+
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_command_success, success);
+ if (ret) {
+ goto end;
+ }
+
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ goto end;
+ }
+ }
+
+end:
+ /* Mi clean-up */
+ if (writer && mi_lttng_writer_destroy(writer)) {
+ /* Preserve original error code */
+ ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
+ }
+
+ if (!opt_session_name && session_name) {
+ free(session_name);
+ }
+
+ /* Overwrite ret if an error occurred when enable_channel */
+ ret = command_ret ? command_ret : ret;
+ poptFreeContext(pc);
+ return ret;
+}
projects / lttng-tools.git / blobdiff