/****************************************************************************
* apps/system/critmon/critmon.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <dirent.h>
#include <sched.h>
#include <syslog.h>
#include <errno.h>
#ifdef CONFIG_SYSTEM_CRITMONITOR
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_SYSTEM_CRITMONITOR_DAEMON_STACKSIZE
# define CONFIG_SYSTEM_CRITMONITOR_DAEMON_STACKSIZE 2048
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_DAEMON_PRIORITY
# define CONFIG_SYSTEM_CRITMONITOR_DAEMON_PRIORITY 50
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_INTERVAL
# define CONFIG_SYSTEM_CRITMONITOR_INTERVAL 2
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT
# define CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/proc"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct critmon_state_s
{
volatile bool started;
volatile bool stop;
pid_t pid;
char line[80];
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct critmon_state_s g_critmon;
#if CONFIG_TASK_NAME_SIZE > 0
static const char g_name[] = "Name:";
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: critmon_isolate_value
****************************************************************************/
static FAR char *critmon_isolate_value(FAR char *line)
{
FAR char *ptr;
while (isblank(*line) && *line != '\0')
{
line++;
}
ptr = line;
while (*ptr != '\n' && *ptr != '\r' && *ptr != '\0')
{
ptr++;
}
*ptr = '\0';
return line;
}
/****************************************************************************
* Name: critmon_process_directory
****************************************************************************/
static int critmon_process_directory(FAR struct dirent *entryp)
{
FAR const char *tmpstr;
FAR char *filepath;
FAR char *maxpreemp;
FAR char *maxcrit;
FAR char *maxrun;
FAR char *endptr;
FILE *stream;
int errcode;
int len;
int ret;
#if CONFIG_TASK_NAME_SIZE > 0
FAR char *name = NULL;
/* Read the task status to get the task name */
filepath = NULL;
ret = asprintf(&filepath,
CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/%s/status",
entryp->d_name);
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr,
"Csection Monitor: Failed to create path to status file: %d\n",
errcode);
return -errcode;
}
/* Open the status file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
while (fgets(g_critmon.line, 80, stream) != NULL)
{
g_critmon.line[79] = '\n';
len = strlen(g_name);
if (strncmp(g_critmon.line, g_name, len) == 0)
{
tmpstr = critmon_isolate_value(&g_critmon.line[len]);
if (*tmpstr == '\0')
{
ret = -EINVAL;
goto errout_with_stream;
}
name = strdup(tmpstr);
if (name == NULL)
{
ret = -EINVAL;
goto errout_with_stream;
}
}
}
free(filepath);
fclose(stream);
#endif
/* Read critical section information */
filepath = NULL;
ret = asprintf(&filepath,
CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/%s/critmon",
entryp->d_name);
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: "
"Failed to create path to Csection file: %d\n",
errcode);
ret = -EINVAL;
goto errout_with_name;
}
/* Open the Csection file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
/* Read the line containing the Csection max durations */
if (fgets(g_critmon.line, 80, stream) == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to read from %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
/* Input Format: X.XXXXXXXXX,X.XXXXXXXXX,X.XXXXXXXXX
* Output Format: X.XXXXXXXXX X.XXXXXXXXX X.XXXXXXXXX NNNNN <name>
*/
maxpreemp = g_critmon.line;
maxcrit = strchr(g_critmon.line, ',');
if (maxcrit != NULL)
{
*maxcrit++ = '\0';
maxrun = strchr(maxcrit, ',');
if (maxrun != NULL)
{
*maxrun++ = '\0';
endptr = strchr(maxrun, '\n');
if (endptr != NULL)
{
*endptr = '\0';
}
}
else
{
maxrun = "None";
}
}
else
{
maxcrit = "None";
maxrun = "None";
}
/* Finally, output the stack info that we gleaned from the procfs */
#if CONFIG_TASK_NAME_SIZE > 0
printf("%11s %11s %11s %5s %s\n",
maxpreemp, maxcrit, maxrun, entryp->d_name, name);
#else
printf("%11s %11s %5s\n",
maxpreemp, maxcrit, entryp->d_name);
#endif
ret = OK;
errout_with_stream:
fclose(stream);
errout_with_filepath:
free(filepath);
errout_with_name:
#if CONFIG_TASK_NAME_SIZE > 0
if (name != NULL)
{
free(name);
}
#endif
return ret;
}
/****************************************************************************
* Name: critmon_check_name
****************************************************************************/
static bool critmon_check_name(FAR char *name)
{
int i;
/* Check each character in the name */
for (i = 0; i < NAME_MAX && name[i] != '\0'; i++)
{
if (!isdigit(name[i]))
{
/* Name contains something other than a decimal numeric character */
return false;
}
}
return true;
}
/****************************************************************************
* Name: critmon_global_crit
****************************************************************************/
static void critmon_global_crit(void)
{
FAR char *filepath;
FAR char *cpu;
FAR char *maxpreemp;
FAR char *maxcrit;
FAR char *endptr;
FILE *stream;
int errcode;
int ret;
/* Read critical section information */
filepath = NULL;
ret = asprintf(&filepath,
CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/critmon");
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: "
"Failed to create path to Csection file: %d\n",
errcode);
return;
}
/* Open the Csection file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, errcode);
goto errout_with_filepath;
}
/* Read the line containing the Csection max durations for each CPU */
while (fgets(g_critmon.line, 80, stream) != NULL)
{
/* Input Format: X,X.XXXXXXXXX,X.XXXXXXXXX
* Output Format: X.XXXXXXXXX X.XXXXXXXXX CPU X
*/
cpu = g_critmon.line;
maxpreemp = strchr(g_critmon.line, ',');
if (maxpreemp != NULL)
{
*maxpreemp++ = '\0';
maxcrit = strchr(maxpreemp, ',');
if (maxcrit != NULL)
{
*maxcrit++ = '\0';
endptr = strchr(maxcrit, '\n');
if (endptr != NULL)
{
*endptr = '\0';
}
}
else
{
maxcrit = "None";
}
}
else
{
maxpreemp = "None";
maxcrit = "None";
}
/* Finally, output the stack info that we gleaned from the procfs */
printf("%11s %11s ----------- ----- CPU %s\n",
maxpreemp, maxcrit, cpu);
}
fclose(stream);
errout_with_filepath:
free(filepath);
}
/****************************************************************************
* Name: critmon_list_once
****************************************************************************/
static int critmon_list_once(void)
{
int exitcode = EXIT_SUCCESS;
int errcount = 0;
DIR *dirp;
int ret;
/* Output a Header */
#if CONFIG_TASK_NAME_SIZE > 0
printf("PRE-EMPTION CSECTION RUN PID DESCRIPTION\n");
#else
printf("PRE-EMPTION CSECTION RUN PID\n");
#endif
/* Should global usage first */
critmon_global_crit();
/* Open the top-level procfs directory */
dirp = opendir(CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT);
if (dirp == NULL)
{
/* Failed to open the directory */
fprintf(stderr, "Csection Monitor: Failed to open directory: %s\n",
CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT);
if (++errcount > 100)
{
fprintf(stderr, "Csection Monitor: Too many errors ... exiting\n");
return EXIT_FAILURE;
}
}
/* Read each directory entry */
for (; ; )
{
FAR struct dirent *entryp = readdir(dirp);
if (entryp == NULL)
{
/* Finished with this directory */
break;
}
/* Task/thread entries in the /proc directory will all be (1)
* directories with (2) all numeric names.
*/
if (DIRENT_ISDIRECTORY(entryp->d_type) &&
critmon_check_name(entryp->d_name))
{
/* Looks good -- process the directory */
ret = critmon_process_directory(entryp);
if (ret < 0)
{
/* Failed to process the thread directory */
fprintf(stderr, "Csection Monitor: "
"Failed to process sub-directory: %s\n",
entryp->d_name);
if (++errcount > 100)
{
fprintf(stderr, "Csection Monitor: "
"Too many errors ... exiting\n");
exitcode = EXIT_FAILURE;
break;
}
}
}
}
closedir(dirp);
fputc('\n', stdout);
return exitcode;
}
/****************************************************************************
* Name: critmon_daemon
****************************************************************************/
static int critmon_daemon(int argc, char **argv)
{
int exitcode = EXIT_SUCCESS;
printf("Csection Monitor: Running: %d\n", g_critmon.pid);
/* Loop until we detect that there is a request to stop. */
while (!g_critmon.stop)
{
exitcode = critmon_list_once();
if (exitcode != EXIT_SUCCESS)
{
break;
}
/* Wait for the next sample interval */
sleep(CONFIG_SYSTEM_CRITMONITOR_INTERVAL);
}
/* Stopped */
g_critmon.stop = false;
g_critmon.started = false;
printf("Csection Monitor: Stopped: %d\n", g_critmon.pid);
return exitcode;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int critmon_start_main(int argc, char **argv)
{
/* Has the monitor already started? */
sched_lock();
if (!g_critmon.started)
{
int ret;
/* No.. start it now */
/* Then start the stack monitoring daemon */
g_critmon.started = true;
g_critmon.stop = false;
ret = task_create("Csection Monitor",
CONFIG_SYSTEM_CRITMONITOR_DAEMON_PRIORITY,
CONFIG_SYSTEM_CRITMONITOR_DAEMON_STACKSIZE,
(main_t)critmon_daemon, (FAR char * const *)NULL);
if (ret < 0)
{
int errcode = errno;
printf("Csection Monitor ERROR: "
"Failed to start the stack monitor: %d\n",
errcode);
}
else
{
g_critmon.pid = ret;
printf("Csection Monitor: Started: %d\n", g_critmon.pid);
}
sched_unlock();
return 0;
}
sched_unlock();
printf("Csection Monitor: %s: %d\n",
g_critmon.stop ? "Stopping" : "Running", g_critmon.pid);
return 0;
}
int critmon_stop_main(int argc, char **argv)
{
/* Has the monitor already started? */
if (g_critmon.started)
{
/* Stop the stack monitor. The next time the monitor wakes up,
* it will see the stop indication and will exist.
*/
printf("Csection Monitor: Stopping: %d\n", g_critmon.pid);
g_critmon.stop = true;
}
printf("Csection Monitor: Stopped: %d\n", g_critmon.pid);
return 0;
}
int critmon_main(int argc, char **argv)
{
return critmon_list_once();
}
#endif /* CONFIG_SYSTEM_CRITMONITOR */