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trace-capture.c
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trace-capture.c
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/*
* Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <fcntl.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <signal.h>
#include <unistd.h>
#include <pthread.h>
#include <gtk/gtk.h>
#include <errno.h>
#include <getopt.h>
#include "trace-cmd.h"
#include "trace-gui.h"
#include "kernel-shark.h"
#include "version.h"
#define default_output_file "trace.dat"
#define PLUGIN_NONE "NONE"
#define DIALOG_WIDTH 820
#define DIALOG_HEIGHT 600
#define CAP_STOP "Stop"
#define DEFAULT_MAX_BUF_SIZE 1000000
struct trace_capture {
struct pevent *pevent;
struct shark_info *info;
GtkWidget *main_dialog;
GtkWidget *command_entry;
GtkWidget *file_entry;
GtkWidget *output_text;
GtkTextBuffer *output_buffer;
GtkWidget *event_view;
GtkWidget *plugin_combo;
GtkWidget *settings_combo;
GtkWidget *run_button;
GtkWidget *max_num_entry;
pthread_t thread;
gboolean kill_thread;
gboolean capture_done;
gboolean load_file;
int command_input_fd;
int command_output_fd;
int command_pid;
};
static int is_just_ws(const char *str)
{
int i;
for (i = 0; str[i]; i++)
if (!isspace(str[i]))
break;
return !str[i];
}
static gboolean settings_saved;
static GString *get_home_settings_new(void)
{
char *path = getenv("HOME");
GString *str;
str = g_string_new(path);
g_string_append(str, "/.trace-cmd/settings/");
return str;
}
static int create_home_settings(void)
{
char *path = getenv("HOME");
GString *str;
struct stat st;
int ret;
str = g_string_new(path);
g_string_append(str, "/.trace-cmd");
ret = stat(str->str, &st);
if (ret < 0) {
ret = mkdir(str->str, 0755);
if (ret < 0) {
warning("Can not create %s", str->str);
goto out;
}
}
g_string_append(str, "/settings");
ret = stat(str->str, &st);
if (ret < 0) {
ret = mkdir(str->str, 0755);
if (ret < 0) {
warning("Can not create %s", str->str);
goto out;
}
}
ret = 0;
out:
g_string_free(str, TRUE);
return ret;
}
static GtkTreeModel *create_settings_model(gpointer data)
{
struct dirent *dent;
GtkListStore *list;
GtkTreeIter iter;
struct stat st;
GString *str;
DIR *dir;
int ret;
list = gtk_list_store_new(2, G_TYPE_STRING, G_TYPE_STRING);
gtk_list_store_append(list, &iter);
gtk_list_store_set(list, &iter,
0, "Current",
1, "",
-1);
/* Search for user settings first */
str = get_home_settings_new();
ret = stat(str->str, &st);
if (ret < 0 || !S_ISDIR(st.st_mode))
goto read_system;
dir = opendir(str->str);
if (!dir)
goto read_system;
while ((dent = readdir(dir))) {
const char *name = dent->d_name;
GString *file;
gchar *item;
if (strcmp(name, ".") == 0 ||
strcmp(name, "..") == 0)
continue;
if (strcmp(name + strlen(name) - 4, ".kss") != 0)
continue;
file = g_string_new(str->str);
g_string_append_printf(file, "/%s", name);
/* Save the file name but remove the .kss extention */
item = g_strdup(name);
item[strlen(name) - 4] = 0;
gtk_list_store_append(list, &iter);
gtk_list_store_set(list, &iter,
0, item,
1, file->str,
-1);
g_free(item);
g_string_free(file, TRUE);
}
read_system:
g_string_free(str, TRUE);
return GTK_TREE_MODEL(list);
}
static void refresh_settings(struct trace_capture *cap)
{
GtkTreeModel *model;
model = create_settings_model(NULL);
gtk_combo_box_set_model(GTK_COMBO_BOX(cap->settings_combo), model);
g_object_unref(model);
}
static void ks_clear_capture_events(struct shark_info *info)
{
info->cap_all_events = FALSE;
tracecmd_free_list(info->cap_systems);
info->cap_systems = NULL;
free(info->cap_events);
info->cap_events = NULL;
}
static void clear_capture_events(struct trace_capture *cap)
{
ks_clear_capture_events(cap->info);
}
void kernel_shark_clear_capture(struct shark_info *info)
{
ks_clear_capture_events(info);
g_free(info->cap_plugin);
info->cap_plugin = NULL;
g_free(info->cap_settings_name);
info->cap_settings_name = NULL;
free(info->cap_file);
info->cap_file = NULL;
g_free(info->cap_buffer_output);
info->cap_buffer_output = NULL;
}
static gboolean end_capture(struct trace_capture *cap)
{
const char *filename;
const char *val;
int pid;
val = gtk_button_get_label(GTK_BUTTON(cap->run_button));
if (strcmp(val, CAP_STOP) != 0)
return FALSE;
gtk_button_set_label(GTK_BUTTON(cap->run_button), "Run");
cap->capture_done = TRUE;
pid = cap->command_pid;
cap->command_pid = 0;
if (pid) {
kill(pid, SIGINT);
gdk_threads_leave();
waitpid(pid, NULL, 0);
gdk_threads_enter();
}
if (cap->kill_thread) {
gdk_threads_leave();
pthread_join(cap->thread, NULL);
gdk_threads_enter();
cap->kill_thread = FALSE;
}
if (cap->command_input_fd) {
close(cap->command_input_fd);
cap->command_input_fd = 0;
}
if (cap->command_output_fd) {
close(cap->command_output_fd);
cap->command_output_fd = 0;
}
if (cap->load_file) {
filename = gtk_entry_get_text(GTK_ENTRY(cap->file_entry));
kernelshark_load_file(cap->info, filename);
cap->load_file = FALSE;
}
return TRUE;
}
static char *get_tracing_dir(void)
{
static char *tracing_dir;
if (tracing_dir)
return tracing_dir;
tracing_dir = tracecmd_find_tracing_dir();
return tracing_dir;
}
static int is_latency(char *plugin)
{
return strcmp(plugin, "wakeup") == 0 ||
strcmp(plugin, "wakeup_rt") == 0 ||
strcmp(plugin, "irqsoff") == 0 ||
strcmp(plugin, "preemptoff") == 0 ||
strcmp(plugin, "preemptirqsoff") == 0;
}
static int calculate_trace_cmd_words(struct trace_capture *cap)
{
int words = 4; /* trace-cmd record -o file */
int i;
if (cap->info->cap_all_events)
words += 2;
else {
if (cap->info->cap_systems) {
for (i = 0; cap->info->cap_systems[i]; i++)
words += 2;
}
if (cap->info->cap_events)
for (i = 0; cap->info->cap_events[i] >= 0; i++)
words += 2;
}
if (cap->info->cap_plugin)
words += 2;
return words;
}
static char *find_tracecmd(void)
{
struct stat st;
char *path = getenv("PATH");
char *saveptr;
char *str;
char *loc;
char *tracecmd = NULL;
int len;
int ret;
if (!path)
return NULL;
path = strdup(path);
for (str = path; ; str = NULL) {
loc = strtok_r(str, ":", &saveptr);
if (!loc)
break;
len = strlen(loc) + 11;
tracecmd = malloc_or_die(len);
snprintf(tracecmd, len, "%s/trace-cmd", loc);
ret = stat(tracecmd, &st);
if (ret >= 0 && S_ISREG(st.st_mode)) {
/* Do we have execute permissions */
if (st.st_uid == geteuid() &&
st.st_mode & S_IXUSR)
break;
if (st.st_gid == getegid() &&
st.st_mode & S_IXGRP)
break;
if (st.st_mode & S_IXOTH)
break;
}
free(tracecmd);
tracecmd = NULL;
}
free(path);
return tracecmd;
}
static int add_trace_cmd_words(struct trace_capture *cap, char **args)
{
struct event_format *event;
char **systems = cap->info->cap_systems;
const gchar *output;
int *events = cap->info->cap_events;
int words = 0;
int len;
int i;
output = gtk_entry_get_text(GTK_ENTRY(cap->file_entry));
args[words++] = find_tracecmd();
if (!args[0])
return -1;
args[words++] = strdup("record");
args[words++] = strdup("-o");
args[words++] = strdup(output);
if (cap->info->cap_plugin) {
args[words++] = strdup("-p");
args[words++] = strdup(cap->info->cap_plugin);
}
if (cap->info->cap_all_events) {
args[words++] = strdup("-e");
args[words++] = strdup("all");
} else {
if (systems) {
for (i = 0; systems[i]; i++) {
args[words++] = strdup("-e");
args[words++] = strdup(systems[i]);
}
}
if (events) {
for (i = 0; events[i] >= 0; i++) {
event = pevent_find_event(cap->pevent, events[i]);
if (!event)
continue;
args[words++] = strdup("-e");
len = strlen(event->name) + strlen(event->system) + 2;
args[words] = malloc_or_die(len);
snprintf(args[words++], len, "%s:%s",
event->system, event->name);
}
}
}
return words;
}
static gchar *get_combo_text(GtkComboBox *combo)
{
GtkTreeModel *model;
GtkTreeIter iter;
gchar *text;
model = gtk_combo_box_get_model(combo);
if (!model)
return NULL;
if (!gtk_combo_box_get_active_iter(combo, &iter))
return NULL;
gtk_tree_model_get(model, &iter,
0, &text,
-1);
return text;
}
static void update_plugin(struct trace_capture *cap)
{
cap->info->cap_plugin = get_combo_text(GTK_COMBO_BOX(cap->plugin_combo));
if (strcmp(cap->info->cap_plugin, PLUGIN_NONE) == 0) {
g_free(cap->info->cap_plugin);
cap->info->cap_plugin = NULL;
}
}
/*
* The plugin and settings combo's are set by the first item
* in the model. The can share the same code to set the model.
*
* Return TRUE if set, FALSE if name was not found.
*/
static int set_combo(GtkComboBox *combo, const char *name)
{
GtkTreeModel *model;
GtkTreeIter iter;
gchar *text;
gboolean ret;
model = gtk_combo_box_get_model(combo);
if (!model)
return FALSE;
if (!gtk_tree_model_get_iter_first(model, &iter))
return FALSE;
do {
gtk_tree_model_get(model, &iter,
0, &text,
-1);
if (strcmp(text, name) == 0) {
g_free(text);
break;
}
g_free(text);
ret = gtk_tree_model_iter_next(model, &iter);
} while (ret);
if (ret) {
/* Found */
gtk_combo_box_set_active_iter(GTK_COMBO_BOX(combo),
&iter);
return TRUE;
}
/* set to first item (default) */
gtk_tree_model_get_iter_first(model, &iter);
gtk_combo_box_set_active_iter(GTK_COMBO_BOX(combo),
&iter);
return FALSE;
}
static void set_plugin(struct trace_capture *cap)
{
GtkComboBox *combo = GTK_COMBO_BOX(cap->plugin_combo);
const gchar *plugin = cap->info->cap_plugin;
if (!plugin)
plugin = PLUGIN_NONE;
if (set_combo(combo, plugin))
return;
/* Not found? */
g_free(cap->info->cap_plugin);
cap->info->cap_plugin = NULL;
}
static void set_settings(struct trace_capture *cap)
{
GtkComboBox *combo = GTK_COMBO_BOX(cap->settings_combo);
const gchar *name = cap->info->cap_settings_name;
if (!name)
name = "";
if (set_combo(combo, name))
return;
/* Not found? */
g_free(cap->info->cap_settings_name);
cap->info->cap_settings_name = NULL;
}
static void update_events(struct trace_capture *cap)
{
struct shark_info *info = cap->info;
if (!cap->event_view)
return;
clear_capture_events(cap);
trace_extract_event_list_view(cap->event_view,
&info->cap_all_events,
&info->cap_systems,
&info->cap_events);
}
static void execute_command(struct trace_capture *cap)
{
const gchar *ccommand;
gchar *command;
gchar **args;
gboolean space;
int words;
int tc_words;
int i;
update_plugin(cap);
update_events(cap);
ccommand = gtk_entry_get_text(GTK_ENTRY(cap->command_entry));
if (!ccommand || !strlen(ccommand) || is_just_ws(ccommand)) {
words = 0;
command = NULL;
} else {
command = strdup(ccommand);
space = TRUE;
words = 0;
for (i = 0; command[i]; i++) {
if (isspace(command[i]))
space = TRUE;
else {
if (space)
words++;
space = FALSE;
}
}
}
tc_words = calculate_trace_cmd_words(cap);
args = malloc_or_die(sizeof(*args) * (tc_words + words + 1));
add_trace_cmd_words(cap, args);
words = tc_words;
space = TRUE;
for (i = 0; command && command[i]; i++) {
if (isspace(command[i])) {
space = TRUE;
command[i] = 0;
} else {
if (space) {
args[words] = &command[i];
words++;
}
space = FALSE;
}
}
args[words] = NULL;
write(1, "# ", 2);
for (i = 0; args[i]; i++) {
write(1, args[i], strlen(args[i]));
write(1, " ", 1);
}
write(1, "\n", 1);
execvp(args[0], args);
perror("execvp");
for (i = 0; args[i]; i++)
free(args[i]);
free(args);
g_free(cap->info->cap_plugin);
}
static void *monitor_pipes(void *data)
{
struct trace_capture *cap = data;
GtkTextIter start_iter;
GtkTextIter cut_iter;
GtkTextIter iter;
gchar buf[BUFSIZ+1];
struct timeval tv;
const char *val;
fd_set fds;
gboolean eof;
int max_size;
int total;
int del;
int ret;
int r;
gdk_threads_enter();
/* get the max size */
val = gtk_entry_get_text(GTK_ENTRY(cap->max_num_entry));
max_size = atoi(val);
/* Clear the buffer */
gtk_text_buffer_get_start_iter(cap->output_buffer, &start_iter);
gtk_text_buffer_get_end_iter(cap->output_buffer, &cut_iter);
gtk_text_buffer_delete(cap->output_buffer, &start_iter, &cut_iter);
total = 0;
gdk_threads_leave();
do {
FD_ZERO(&fds);
FD_SET(cap->command_input_fd, &fds);
tv.tv_sec = 6;
tv.tv_usec = 0;
ret = select(cap->command_input_fd+1, &fds, NULL, NULL, &tv);
if (ret < 0)
break;
eof = TRUE;
while ((r = read(cap->command_input_fd, buf, BUFSIZ)) > 0) {
eof = FALSE;
buf[r] = 0;
total += r;
if (total > max_size)
del = total - max_size;
else
del = 0;
gdk_threads_enter();
if (del) {
gtk_text_buffer_get_start_iter(cap->output_buffer, &start_iter);
gtk_text_buffer_get_start_iter(cap->output_buffer, &cut_iter);
gtk_text_iter_forward_chars(&cut_iter, del);
gtk_text_buffer_delete(cap->output_buffer, &start_iter, &cut_iter);
total -= del;
}
gtk_text_buffer_get_end_iter(cap->output_buffer,
&iter);
gtk_text_buffer_insert(cap->output_buffer, &iter, buf, -1);
gdk_threads_leave();
}
} while (!cap->capture_done && !eof);
if (eof) {
gdk_threads_enter();
end_capture(cap);
gdk_threads_leave();
}
pthread_exit(NULL);
}
static void run_command(struct trace_capture *cap)
{
int brass[2];
int copper[2];
int pid;
if (pipe(brass) < 0) {
warning("Could not create pipe");
return;
}
if (pipe(copper) < 0) {
warning("Could not create pipe");
goto fail_pipe;
}
if ((pid = fork()) < 0) {
warning("Could not fork process");
goto fail_fork;
}
cap->command_pid = pid;
if (!pid) {
close(brass[0]);
close(copper[1]);
close(0);
close(1);
close(2);
dup(copper[0]);
dup(brass[1]);
dup(brass[1]);
execute_command(cap);
close(1);
exit(0);
}
close(brass[1]);
close(copper[0]);
/* these should never be 0 */
if (!brass[1] || !copper[0])
warning("Pipes have zero as file descriptor");
cap->command_input_fd = brass[0];
cap->command_output_fd = copper[1];
/* Do not create a thread under the gdk lock */
gdk_threads_leave();
if (pthread_create(&cap->thread, NULL, monitor_pipes, cap) < 0)
warning("Failed to create thread");
else {
cap->kill_thread = TRUE;
cap->load_file = TRUE;
}
gdk_threads_enter();
return;
fail_fork:
close(copper[0]);
close(copper[1]);
fail_pipe:
close(brass[0]);
close(brass[1]);
}
static int trim_plugins(char **plugins)
{
int len = 0;
int i;
if (!plugins)
return 0;
for (i = 0; plugins[i]; i++) {
if (is_latency(plugins[i]))
continue;
plugins[len++] = plugins[i];
}
plugins[len] = NULL;
return len;
}
static void
file_clicked (GtkWidget *widget, gpointer data)
{
struct trace_capture *cap = data;
gchar *filename;
filename = trace_get_file_dialog_filter("Trace File", "Save",
TRACE_DIALOG_FILTER_DATA, FALSE);
if (!filename)
return;
gtk_entry_set_text(GTK_ENTRY(cap->file_entry), filename);
}
static void execute_button_clicked(struct trace_capture *cap)
{
struct stat st;
GtkResponseType ret;
const char *filename;
char *tracecmd;
if (end_capture(cap))
return;
tracecmd = find_tracecmd();
if (!tracecmd) {
warning("trace-cmd not found in path");
return;
}
free(tracecmd);
filename = gtk_entry_get_text(GTK_ENTRY(cap->file_entry));
if (stat(filename, &st) >= 0) {
ret = trace_dialog(GTK_WINDOW(cap->main_dialog), TRACE_GUI_ASK,
"The file '%s' already exists.\n"
"Are you sure you want to replace it",
filename);
if (ret == GTK_RESPONSE_NO)
return;
}
gtk_button_set_label(GTK_BUTTON(cap->run_button), CAP_STOP);
run_command(cap);
}
static int load_events(struct trace_capture *cap,
struct tracecmd_xml_handle *handle,
struct tracecmd_xml_system_node *node)
{
struct shark_info *info = cap->info;
struct tracecmd_xml_system_node *event_node;
struct event_format *event;
struct pevent *pevent = cap->pevent;
const char *name;
int *events = NULL;
int event_len = 0;
const char *system;
const char *event_name;
for (node = tracecmd_xml_node_child(node); node;
node = tracecmd_xml_node_next(node)) {
name = tracecmd_xml_node_type(node);
if (strcmp(name, "Event") != 0)
continue;
event_node = tracecmd_xml_node_child(node);
if (!event_node)
continue;
name = tracecmd_xml_node_type(event_node);
if (strcmp(name, "System") != 0)
continue;
system = tracecmd_xml_node_value(handle, event_node);
event_node = tracecmd_xml_node_next(event_node);
if (!event_node)
continue;
name = tracecmd_xml_node_type(event_node);
if (strcmp(name, "Name") != 0)
continue;
event_name = tracecmd_xml_node_value(handle, event_node);
event = pevent_find_event_by_name(pevent, system, event_name);
if (!event)
continue;
events = tracecmd_add_id(events, event->id, event_len++);
}
info->cap_events = events;
return 0;
}
static int load_cap_events(struct trace_capture *cap,
struct tracecmd_xml_handle *handle,
struct tracecmd_xml_system_node *node)
{
struct shark_info *info = cap->info;
const char *name;
char **systems = NULL;
int sys_len = 0;
ks_clear_capture_events(info);
for (node = tracecmd_xml_node_child(node); node;
node = tracecmd_xml_node_next(node)) {
name = tracecmd_xml_node_type(node);
if (strcmp(name, "CaptureType") == 0) {
name = tracecmd_xml_node_value(handle, node);
if (strcmp(name, "all events") == 0) {
info->cap_all_events = TRUE;
break;
}
continue;
} else if (strcmp(name, "System") == 0) {
name = tracecmd_xml_node_value(handle, node);
systems = tracecmd_add_list(systems, name, sys_len++);
} else if (strcmp(name, "Events") == 0)
load_events(cap, handle, node);
}
info->cap_systems = systems;
return 0;
}
static void load_settings(struct trace_capture *cap, gchar *filename)
{
struct shark_info *info = cap->info;
struct tracecmd_xml_system_node *syschild;
struct tracecmd_xml_handle *handle;
struct tracecmd_xml_system *system;
const char *plugin;
const char *name;
handle = tracecmd_xml_open(filename);
if (!handle) {
warning("Could not open %s", filename);
return;
}
system = tracecmd_xml_find_system(handle, "CaptureSettings");
if (!system)
goto out;
syschild = tracecmd_xml_system_node(system);
if (!syschild)
goto out_free_sys;
g_free(info->cap_plugin);
info->cap_plugin = NULL;
do {
name = tracecmd_xml_node_type(syschild);
if (strcmp(name, "Events") == 0) {
load_cap_events(cap, handle, syschild);
trace_update_event_view(cap->event_view,
cap->pevent,
NULL,
info->cap_all_events,
info->cap_systems,
info->cap_events);
}
else if (strcmp(name, "Plugin") == 0) {
plugin = tracecmd_xml_node_value(handle, syschild);
info->cap_plugin = g_strdup(plugin);
} else if (strcmp(name, "Command") == 0) {
name = tracecmd_xml_node_value(handle, syschild);
gtk_entry_set_text(GTK_ENTRY(cap->command_entry), name);
} else if (strcmp(name, "File") == 0) {
name = tracecmd_xml_node_value(handle, syschild);
gtk_entry_set_text(GTK_ENTRY(cap->file_entry), name);
}
syschild = tracecmd_xml_node_next(syschild);
} while (syschild);
set_plugin(cap);
out_free_sys:
tracecmd_xml_free_system(system);
out:
tracecmd_xml_close(handle);
}
static void settings_changed(GtkComboBox *combo,
gpointer data)
{
struct trace_capture *cap = data;
GtkTreeModel *model;
GtkTreeIter iter;
gchar *text;
model = gtk_combo_box_get_model(combo);
if (!model)
return;
if (!gtk_combo_box_get_active_iter(combo, &iter))
return;
gtk_tree_model_get(model, &iter,
1, &text,