--- /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 <common/mi-lttng.h>
+#include <lttng/domain-internal.h>
+
+#include "../command.h"
+
+static char *opt_channels;
+static int opt_kernel;
+static char *opt_session_name;
+static int opt_userspace;
+
+#ifdef LTTNG_EMBED_HELP
+static const char help_msg[] =
+#include <lttng-disable-channel.1.h>
+;
+#endif
+
+enum {
+ OPT_HELP = 1,
+ OPT_USERSPACE,
+ OPT_LIST_OPTIONS,
+};
+
+static struct lttng_handle *handle;
+static struct mi_writer *writer;
+
+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},
+ {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+
+static int mi_partial_channel_print(char *channel_name, unsigned int enabled,
+ int success)
+{
+ int ret;
+
+ LTTNG_ASSERT(writer);
+ LTTNG_ASSERT(channel_name);
+
+ /* Open channel element */
+ ret = mi_lttng_writer_open_element(writer, config_element_channel);
+ if (ret) {
+ goto end;
+ }
+
+ /* Name */
+ ret = mi_lttng_writer_write_element_string(writer, config_element_name,
+ channel_name);
+ if (ret) {
+ goto end;
+ }
+
+ /* Enabled ? */
+ ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled,
+ enabled);
+ if (ret) {
+ goto end;
+ }
+
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_success, success);
+ if (ret) {
+ goto end;
+ }
+
+ /* Closing channel element */
+ ret = mi_lttng_writer_close_element(writer);
+
+end:
+ return ret;
+}
+
+/*
+ * Disabling channel using the lttng API.
+ */
+static int disable_channels(char *session_name)
+{
+ int ret = CMD_SUCCESS, warn = 0, success;
+
+ /* Normal case for disable channed is enabled = 0 */
+ unsigned int enabled = 0;
+ char *channel_name;
+ struct lttng_domain dom;
+
+ memset(&dom, 0, sizeof(dom));
+
+ /* Create lttng domain */
+ if (opt_kernel) {
+ dom.type = LTTNG_DOMAIN_KERNEL;
+ } else if (opt_userspace) {
+ dom.type = LTTNG_DOMAIN_UST;
+ } else {
+ /* Checked by the caller. */
+ abort();
+ }
+
+ handle = lttng_create_handle(session_name, &dom);
+ if (handle == NULL) {
+ ret = -1;
+ goto error;
+ }
+
+ /* Prepare MI */
+ if (lttng_opt_mi) {
+ /* open a channels element */
+ ret = mi_lttng_writer_open_element(writer, config_element_channels);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+
+ }
+
+ /* Strip channel list */
+ channel_name = strtok(opt_channels, ",");
+ while (channel_name != NULL) {
+ DBG("Disabling channel %s", channel_name);
+
+ ret = lttng_disable_channel(handle, channel_name);
+ if (ret < 0) {
+ ERR("Channel %s: %s (session %s)", channel_name,
+ lttng_strerror(ret), session_name);
+ warn = 1;
+
+ /*
+ * Mi:
+ * We assume that if an error occurred the channel is still active.
+ * This might not be the case but is a good assumption.
+ * The client should look at the stderr stream
+ * for more informations.
+ */
+ enabled = 1;
+ success = 0;
+
+ } else {
+ MSG("%s channel %s disabled for session %s",
+ lttng_domain_type_str(dom.type),
+ channel_name, session_name);
+ enabled = 0;
+ success = 1;
+ }
+
+ /* Print the channel */
+ if (lttng_opt_mi) {
+ ret = mi_partial_channel_print(channel_name, enabled, success);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+ /* Next channel */
+ channel_name = strtok(NULL, ",");
+ }
+
+ ret = CMD_SUCCESS;
+
+ /* Close Mi */
+ if (lttng_opt_mi) {
+ /* Close channels element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto error;
+ }
+ }
+
+error:
+ /* Bypass the warning if a more important error happened */
+ if (!ret && warn) {
+ ret = CMD_WARNING;
+ }
+
+ lttng_destroy_handle(handle);
+
+ return ret;
+}
+
+/*
+ * cmd_disable_channels
+ *
+ * Disable channel to trace session
+ */
+int cmd_disable_channels(int argc, const char **argv)
+{
+ int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
+ static poptContext pc;
+ char *session_name = NULL;
+ const char *leftover = NULL;
+
+ 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_USERSPACE:
+ opt_userspace = 1;
+ 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;
+ }
+
+ opt_channels = (char*) poptGetArg(pc);
+ if (opt_channels == NULL) {
+ ERR("Missing channel name(s).\n");
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ leftover = poptGetArg(pc);
+ if (leftover) {
+ ERR("Unknown argument: %s", leftover);
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ if (!opt_session_name) {
+ session_name = get_session_name();
+ if (session_name == NULL) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+ } else {
+ session_name = opt_session_name;
+ }
+
+ /* 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_disable_channel);
+ 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;
+ }
+ }
+
+ command_ret = disable_channels(session_name);
+ if (command_ret) {
+ success = 0;
+ }
+
+ /* Mi closing */
+ if (lttng_opt_mi) {
+ /* Close output element */
+ ret = mi_lttng_writer_close_element(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Success ? */
+ ret = mi_lttng_writer_write_element_bool(writer,
+ mi_lttng_element_success, success);
+ if (ret) {
+ ret = CMD_ERROR;
+ goto end;
+ }
+
+ /* Command element close */
+ ret = mi_lttng_writer_command_close(writer);
+ if (ret) {
+ ret = CMD_ERROR;
+ 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 in disable_channels */
+ ret = command_ret ? command_ret : ret;
+
+ poptFreeContext(pc);
+ return ret;
+}
projects / lttng-tools.git / blobdiff