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/*****************************************************************************
*
* Copyright (c) 2014, Advanced Micro Devices, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Advanced Micro Devices, Inc. nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES, INC. BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <readline/readline.h>
#include <linux/watchdog.h>
#define WATCHDOG_APP_VERSION "0.1"
int fd; /* /dev/watchdog file descriptor */
volatile int ping;
char *show_prompt(void)
{
return "$ ";
}
void sighandler(int sig)
{
printf("\n%s", show_prompt());
}
void pinghandler(int sig)
{
ping = 0;
printf("\n");
/* Set the signal handler back to the original */
signal(SIGINT, sighandler);
}
void show_license(void)
{
printf("/*****************************************************************************\n"
"*\n"
"* Copyright (c) 2014, Advanced Micro Devices, Inc.\n"
"* All rights reserved.\n"
"*\n"
"* Redistribution and use in source and binary forms, with or without\n"
"* modification, are permitted provided that the following conditions are met:\n"
"* * Redistributions of source code must retain the above copyright\n"
"* notice, this list of conditions and the following disclaimer.\n"
"* * Redistributions in binary form must reproduce the above copyright\n"
"* notice, this list of conditions and the following disclaimer in the\n"
"* documentation and/or other materials provided with the distribution.\n"
"* * Neither the name of Advanced Micro Devices, Inc. nor the names of\n"
"* its contributors may be used to endorse or promote products derived\n"
"* from this software without specific prior written permission.\n"
"*\n"
"* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\n"
"* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n"
"* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\n"
"* DISCLAIMED. IN NO EVENT SHALL ADVANCED MICRO DEVICES, INC. BE LIABLE FOR ANY\n"
"* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\n"
"* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\n"
"* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND\n"
"* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n"
"* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\n"
"* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n"
"*\n"
"*\n"
"***************************************************************************/\n");
}
void print_usage()
{
printf("\nCommands Supported ->\n");
printf(" disablewatchdog : Disables the Watchdog Timer\n");
printf(" enablewatchdog : Enables the Watchdog Timer\n");
printf(" getfeatures : Shows the features supported by the Watchdog implementation\n");
printf(" getstatus : Gives the current status of Watchdog Timer\n");
printf(" getbootstatus : Displays the status of Watchdog Hardware after reboot or fresh boot\n");
printf(" ping : Resets Watchdog Timer at regular intervals\n");
printf(" gettimeout : Gives the value of Watchdog timeout (in frequency units)\n");
printf(" gettimeleft : Gives the current value of Watchdog Timer (in frequency units)\n");
printf(" sendmagicchar : Sends the magic character 'V' to the Watchdog device\n");
printf(" settimeout <timeout> : Sets the new value for Watchdog timeout (in frequency units)\n");
printf(" license : Displays the terms of LICENSE for this application\n");
printf(" help : Displays help text\n");
printf(" exit : Exits the application\n\n");
}
void parse_cmd(const char *cmdline)
{
if ((cmdline == NULL) || (strncmp(cmdline, "exit", 4) == 0)) {
printf("\nExiting...\n");
printf("\nIf the Watchdog Timer was not disabled, and you did not send the magic character,\n"
"Watchdog Timer is still ticking, and your system will reboot soon\n");
if(close(fd) < 0)
perror("Error closing /dev/watchdog");
exit(EXIT_SUCCESS);
} else if (strncmp(cmdline, "help", 4) == 0)
print_usage();
else if (strncmp(cmdline, "disablewatchdog", 7) == 0) {
int flags;
printf("\nDisabling watchdog timer...\n");
flags = WDIOS_DISABLECARD;
if (ioctl(fd, WDIOC_SETOPTIONS, &flags) < 0)
perror("Could not disable watchdog");
} else if (strncmp(cmdline, "enablewatchdog", 6) == 0) {
int flags;
printf("\nEnabling watchdog timer...\n");
flags = WDIOS_ENABLECARD;
if (ioctl(fd, WDIOC_SETOPTIONS, &flags) < 0)
printf("Could not enable watchdog");
} else if (strncmp(cmdline, "getfeatures", 10) == 0) {
struct watchdog_info info;
if(ioctl(fd, WDIOC_GETSUPPORT, &info) < 0)
perror("Could not get watchdog features");
printf("\nIdentity:\t\t%s\n", info.identity);
printf("Firmware Version:\t%u\n", info.firmware_version);
printf("Options Set: \n"
"%s%s%s%s%s%s%s%s%s%s%s\n",
info.options & WDIOF_OVERHEAT ? "\t\t\tReset due to CPU overheat\n": "",
info.options & WDIOF_FANFAULT ? "\t\t\tFan failed\n": "",
info.options & WDIOF_EXTERN1 ? "\t\t\tExternal relay 1\n": "",
info.options & WDIOF_EXTERN2 ? "\t\t\tExternal relay 2\n": "",
info.options & WDIOF_POWERUNDER ? "\t\t\tPower bad/power fault\n": "",
info.options & WDIOF_CARDRESET ? "\t\t\tCard previously reset the CPU\n": "",
info.options & WDIOF_POWEROVER ? "\t\t\tPower over voltage\n": "",
info.options & WDIOF_SETTIMEOUT ? "\t\t\tSet timeout (in frequency units)\n": "",
info.options & WDIOF_MAGICCLOSE ? "\t\t\tSupports magic close character\n": "",
info.options & WDIOF_PRETIMEOUT ? "\t\t\tPretimeout (in frequency units)\n": "",
info.options & WDIOF_KEEPALIVEPING ? "\t\t\tKeep alive ping reply\n": "");
} else if (strncmp(cmdline, "getstatus", 9) == 0) {
int status;
printf("\n");
if(ioctl(fd, WDIOC_GETSTATUS, &status) < 0)
perror("Could not get watchdog status");
if (status & (1 << 0))
printf("\nWatchdog device is active\n");
if (status & (1 << 1))
printf("Watchdog device opened via /dev/watchdog\n");
if (status & (1 << 2))
printf("Received magic char\n");
if (status & (1 << 3))
printf("nowayout set\n");
if (status & (1 << 4))
printf("Watchdog device unregistered\n");
} else if (strncmp(cmdline, "getbootstatus", 7) == 0) {
int bootstatus;
if(ioctl(fd, WDIOC_GETBOOTSTATUS, &bootstatus) < 0)
perror("Could not get bootstatus");
printf("\nbootstatus: \n"
"%s%s%s%s%s%s%s%s%s%s%s\n",
bootstatus & WDIOF_OVERHEAT ? "\t\t\tReset due to CPU overheat\n": "",
bootstatus & WDIOF_FANFAULT ? "\t\t\tFan failed\n": "",
bootstatus & WDIOF_EXTERN1 ? "\t\t\tExternal relay 1\n": "",
bootstatus & WDIOF_EXTERN2 ? "\t\t\tExternal relay 2\n": "",
bootstatus & WDIOF_POWERUNDER ? "\t\t\tPower bad/power fault\n": "",
bootstatus & WDIOF_CARDRESET ? "\t\t\tCard previously reset the CPU\n": "",
bootstatus & WDIOF_POWEROVER ? "\t\t\tPower over voltage\n": "",
bootstatus & WDIOF_SETTIMEOUT ? "\t\t\tSet timeout (in frequency units)\n": "",
bootstatus & WDIOF_MAGICCLOSE ? "\t\t\tSupports magic close character\n": "",
bootstatus & WDIOF_PRETIMEOUT ? "\t\t\tPretimeout (in frequency units)\n": "",
bootstatus & WDIOF_KEEPALIVEPING ? "\t\t\tKeep alive ping reply\n": "");
} else if (strncmp(cmdline, "ping", 4) == 0) {
int dummy;
printf("\nContinuosly resetting Watchdog...press Ctrl+C to stop\n");
printf("\nOnce you stop pinging, Watchog Timer will start counting down...\n");
printf("...If the Watchdog Timer was enabled\n");
/* Lets set a different handler for Ctrl+C */
signal(SIGINT, pinghandler);
ping = 1;
while (ping) {
if(ioctl(fd, WDIOC_KEEPALIVE, &dummy) < 0) {
perror("Error sending ping");
break;
}
sleep(1);
}
} else if (strncmp(cmdline, "gettimeout", 10) == 0) {
int timeout;
if(ioctl(fd, WDIOC_GETTIMEOUT, &timeout) < 0)
perror("Error getting watchdog timeout");
printf("\nCurrent setting of timeout is %d frequency units\n", timeout);
} else if (strncmp(cmdline, "gettimeleft", 11) == 0) {
int timeleft;
if(ioctl(fd, WDIOC_GETTIMELEFT, &timeleft) < 0)
perror("Error getting watchdog timeleft");
printf("\nTime left for system reboot/shutdown is %d frequency units\n", timeleft);
} else if (strncmp(cmdline, "sendmagicchar", 9) == 0) {
printf("\nSending magic character to Watchdog device...\n");
printf("\nWatchdog Timer will be stopped once you exit the application\n");
if(write(fd, "V", 1) < 0)
perror("Could not send magic character");
} else if (strncmp(cmdline, "settimeout", 10) == 0) {
const char *charp = cmdline;
int timeout;
/* Lets point to the end of first token */
charp += strlen("settimeout");
/* Skip blank characters */
while (*charp == ' ' || *charp == '\t' || *charp == '\n')
charp++;
/* Now we should be pointing to the first 'digit' character */
timeout = atoi(charp);
if(ioctl(fd, WDIOC_SETTIMEOUT, &timeout) < 0) {
perror("Could not set watchdog timeout");
return;
}
printf("\nSetting timeout to %d frequency units\n", timeout);
printf("Watchdog Timer will start counting down with the new timeout value\n");
} else if (strncmp(cmdline, "license", 7) == 0) {
show_license();
} else {
printf("\nUnknown command\n");
print_usage();
}
}
int main(void)
{
char *cmdline= NULL;
printf("Watchdog sample application version: %s\n", WATCHDOG_APP_VERSION);
printf("Copyright (c) 2014, Advanced Micro Devices, Inc.\n"
"This sample application comes with ABSOLUTELY NO WARRANTY;\n"
"This is free software, and you are welcome to redistribute it\n"
"under certain conditions; type `license' for details.\n\n");
if ((fd = open("/dev/watchdog", O_WRONLY)) < 0) {
perror("Could not open /dev/watchdog");
exit(1);
}
/* Handler for Ctrl+C */
signal(SIGINT, sighandler);
while (1) {
cmdline = readline(show_prompt());
parse_cmd(cmdline);
/* Free the memory malloc'ed by readline */
free(cmdline);
}
/* Should never reach here */
return 0;
}
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