-/*
- * 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;
-}