+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2020 Francis Deslauriers <francis.deslauriers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#include <stdbool.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-
-#include <lttng/constant.h>
-
-#include <common/compat/errno.h>
-#include "error.h"
-#include "macros.h"
-#include "spawn-viewer.h"
-
-
-static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN;
-static const char *babeltrace2_bin = CONFIG_BABELTRACE2_BIN;
-
-/*
- * This is needed for each viewer since we are using execvp().
- */
-static const char *babeltrace_opts[] = { "babeltrace" };
-static const char *babeltrace2_opts[] = { "babeltrace2" };
-
-/*
- * Type is also use as the index in the viewers array. So please, make sure
- * your enum value is in the right order in the array below.
- */
-enum viewer_type {
- VIEWER_BABELTRACE = 0,
- VIEWER_BABELTRACE2 = 1,
- VIEWER_USER_DEFINED = 2,
-};
-
-static const struct viewer {
- const char *exec_name;
- enum viewer_type type;
-} viewers[] = {
- { "babeltrace", VIEWER_BABELTRACE },
- { "babeltrace2", VIEWER_BABELTRACE2 },
- { NULL, VIEWER_USER_DEFINED },
-};
-
-static const struct viewer *parse_viewer_option(const char *opt_viewer)
-{
- if (opt_viewer == NULL) {
- /* Default is babeltrace2 */
- return &(viewers[VIEWER_BABELTRACE2]);
- }
-
- return &(viewers[VIEWER_USER_DEFINED]);
-}
-
-/*
- * Alloc an array of string pointer from a simple string having all options
- * seperated by spaces. Also adds the trace path to the arguments.
- *
- * The returning pointer is ready to be passed to execvp().
- */
-static char **alloc_argv_from_user_opts(char *opts, const char *trace_path)
-{
- int i = 0, ignore_space = 0;
- unsigned int num_opts = 1;
- char **argv, *token = opts, *saveptr = NULL;
-
- /* Count number of arguments. */
- do {
- if (*token == ' ') {
- /* Use to ignore consecutive spaces */
- if (!ignore_space) {
- num_opts++;
- }
- ignore_space = 1;
- } else {
- ignore_space = 0;
- }
- token++;
- } while (*token != '\0');
-
- /* Add two here for the NULL terminating element and trace path */
- argv = zmalloc(sizeof(char *) * (num_opts + 2));
- if (argv == NULL) {
- goto error;
- }
-
- token = strtok_r(opts, " ", &saveptr);
- while (token != NULL) {
- argv[i] = strdup(token);
- if (argv[i] == NULL) {
- goto error;
- }
- token = strtok_r(NULL, " ", &saveptr);
- i++;
- }
-
- argv[num_opts] = (char *) trace_path;
- argv[num_opts + 1] = NULL;
-
- return argv;
-
-error:
- if (argv) {
- for (i = 0; i < num_opts + 2; i++) {
- free(argv[i]);
- }
- free(argv);
- }
-
- return NULL;
-}
-
-/*
- * Alloc an array of string pointer from an array of strings. It also adds
- * the trace path to the argv.
- *
- * The returning pointer is ready to be passed to execvp().
- */
-static char **alloc_argv_from_local_opts(const char **opts, size_t opts_len,
- const char *trace_path, bool opt_live_mode)
-{
- char **argv;
- size_t size, mem_len;
-
- /* Add one for the NULL terminating element. */
- mem_len = opts_len + 1;
- if (opt_live_mode) {
- /* Add 3 option for the live mode being "-i lttng-live URL". */
- mem_len += 3;
- } else {
- /* Add option for the trace path. */
- mem_len += 1;
- }
-
- size = sizeof(char *) * mem_len;
-
- /* Add two here for the trace_path and the NULL terminating element. */
- argv = zmalloc(size);
- if (argv == NULL) {
- goto error;
- }
-
- memcpy(argv, opts, sizeof(char *) * opts_len);
-
- if (opt_live_mode) {
- argv[opts_len] = (char *) "-i";
- argv[opts_len + 1] = (char *) "lttng-live";
- argv[opts_len + 2] = (char *) trace_path;
- argv[opts_len + 3] = NULL;
- } else {
- argv[opts_len] = (char *) trace_path;
- argv[opts_len + 1] = NULL;
- }
-
-error:
- return argv;
-}
-
-
-/*
- * Spawn viewer with the trace directory path.
- */
-int spawn_viewer(const char *trace_path, char *opt_viewer, bool opt_live_mode)
-{
- int ret = 0;
- struct stat status;
- const char *viewer_bin = NULL;
- const struct viewer *viewer;
- char **argv = NULL;
-
- /* Check for --viewer option. */
- viewer = parse_viewer_option(opt_viewer);
- if (viewer == NULL) {
- ret = -1;
- goto error;
- }
-
-retry_viewer:
- switch (viewer->type) {
- case VIEWER_BABELTRACE2:
- if (stat(babeltrace2_bin, &status) == 0) {
- viewer_bin = babeltrace2_bin;
- } else {
- viewer_bin = viewer->exec_name;
- }
- argv = alloc_argv_from_local_opts(babeltrace2_opts,
- ARRAY_SIZE(babeltrace2_opts), trace_path,
- opt_live_mode);
- break;
- case VIEWER_BABELTRACE:
- if (stat(babeltrace_bin, &status) == 0) {
- viewer_bin = babeltrace_bin;
- } else {
- viewer_bin = viewer->exec_name;
- }
- argv = alloc_argv_from_local_opts(babeltrace_opts,
- ARRAY_SIZE(babeltrace_opts), trace_path,
- opt_live_mode);
- break;
- case VIEWER_USER_DEFINED:
- argv = alloc_argv_from_user_opts(opt_viewer, trace_path);
- if (argv) {
- viewer_bin = argv[0];
- }
- break;
- default:
- abort();
- }
-
- if (argv == NULL || !viewer_bin) {
- ret = -1;
- goto error;
- }
-
- DBG("Using %s viewer", viewer_bin);
-
- ret = execvp(viewer_bin, argv);
- if (ret) {
- if (errno == ENOENT && viewer->exec_name) {
- if (viewer->type == VIEWER_BABELTRACE2) {
- /* Fallback to legacy babeltrace. */
- DBG("Default viewer \"%s\" not installed on the system, falling back to \"%s\"",
- viewers[VIEWER_BABELTRACE2].exec_name,
- viewers[VIEWER_BABELTRACE].exec_name);
- viewer = &viewers[VIEWER_BABELTRACE];
- free(argv);
- argv = NULL;
- goto retry_viewer;
- } else {
- ERR("Default viewer \"%s\" (and fallback \"%s\") not found on the system",
- viewers[VIEWER_BABELTRACE2].exec_name,
- viewers[VIEWER_BABELTRACE].exec_name);
- }
- } else {
- PERROR("Failed to launch \"%s\" viewer", viewer_bin);
- }
- ret = -1;
- goto error;
- }
-
- /*
- * This function should never return if successfull because `execvp(3)`
- * onle returns if an error has occurred.
- */
- LTTNG_ASSERT(ret != 0);
-error:
- free(argv);
- return ret;
-}
projects / lttng-tools.git / blobdiff