tools/testing/selftests/watchdog/watchdog-test.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
 * Watchdog Driver Test Program
 * - Tests all ioctls
 * - Tests Magic Close - CONFIG_WATCHDOG_NOWAYOUT
 * - Could be tested against softdog driver on systems that
 *   don't have watchdog hardware.
 * - TODO:
 * - Enhance test to add coverage for WDIOC_GETTEMP.
 *
 * Reference: Documentation/watchdog/watchdog-api.rst
  */

 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include <fcntl.h>
 #include <signal.h>
 #include <getopt.h>
 #include <sys/ioctl.h>
 #include <linux/types.h>
 #include <linux/watchdog.h>

 #define DEFAULT_PING_RATE	1

 int fd;
 const char v = 'V';
 static const char sopts[] = "bdehp:st:Tn:NLf:i";
 static const struct option lopts[] = {
 	{"bootstatus",          no_argument, NULL, 'b'},
 	{"disable",             no_argument, NULL, 'd'},
 	{"enable",              no_argument, NULL, 'e'},
 	{"help",                no_argument, NULL, 'h'},
 	{"pingrate",      required_argument, NULL, 'p'},
 	{"status",              no_argument, NULL, 's'},
 	{"timeout",       required_argument, NULL, 't'},
 	{"gettimeout",          no_argument, NULL, 'T'},
 	{"pretimeout",    required_argument, NULL, 'n'},
 	{"getpretimeout",       no_argument, NULL, 'N'},
 	{"gettimeleft",		no_argument, NULL, 'L'},
 	{"file",          required_argument, NULL, 'f'},
 	{"info",		no_argument, NULL, 'i'},
 	{NULL,                  no_argument, NULL, 0x0}
 };

 /*
  * This function simply sends an IOCTL to the driver, which in turn ticks
  * the PC Watchdog card to reset its internal timer so it doesn't trigger
  * a computer reset.
  */
 static void keep_alive(void)
 {
 	int dummy;
 	int ret;

 	ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
 	if (!ret)
 		printf(".");
 }

 /*
  * The main program.  Run the program with "-d" to disable the card,
  * or "-e" to enable the card.
  */

 static void term(int sig)
 {
 	int ret = write(fd, &v, 1);

 	close(fd);
 	if (ret < 0)
 		printf("\nStopping watchdog ticks failed (%d)...\n", errno);
 	else
 		printf("\nStopping watchdog ticks...\n");
 	exit(0);
 }

 static void usage(char *progname)
 {
 	printf("Usage: %s [options]\n", progname);
 	printf(" -f, --file\t\tOpen watchdog device file\n");
 	printf("\t\t\tDefault is /dev/watchdog\n");
 	printf(" -i, --info\t\tShow watchdog_info\n");
 	printf(" -s, --status\t\tGet status & supported features\n");
 	printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n");
 	printf(" -d, --disable\t\tTurn off the watchdog timer\n");
 	printf(" -e, --enable\t\tTurn on the watchdog timer\n");
 	printf(" -h, --help\t\tPrint the help message\n");
 	printf(" -p, --pingrate=P\tSet ping rate to P seconds (default %d)\n",
 	       DEFAULT_PING_RATE);
 	printf(" -t, --timeout=T\tSet timeout to T seconds\n");
 	printf(" -T, --gettimeout\tGet the timeout\n");
 	printf(" -n, --pretimeout=T\tSet the pretimeout to T seconds\n");
 	printf(" -N, --getpretimeout\tGet the pretimeout\n");
 	printf(" -L, --gettimeleft\tGet the time left until timer expires\n");
 	printf("\n");
 	printf("Parameters are parsed left-to-right in real-time.\n");
 	printf("Example: %s -d -t 10 -p 5 -e\n", progname);
 	printf("Example: %s -t 12 -T -n 7 -N\n", progname);
 }

 struct wdiof_status {
 	int flag;
 	const char *status_str;
 };

 #define WDIOF_NUM_STATUS 8

 static const struct wdiof_status wdiof_status[WDIOF_NUM_STATUS] = {
 	{WDIOF_SETTIMEOUT,  "Set timeout (in seconds)"},
 	{WDIOF_MAGICCLOSE,  "Supports magic close char"},
 	{WDIOF_PRETIMEOUT,  "Pretimeout (in seconds), get/set"},
 	{WDIOF_ALARMONLY,  "Watchdog triggers a management or other external alarm not a reboot"},
 	{WDIOF_KEEPALIVEPING,  "Keep alive ping reply"},
 	{WDIOS_DISABLECARD,  "Turn off the watchdog timer"},
 	{WDIOS_ENABLECARD,  "Turn on the watchdog timer"},
 	{WDIOS_TEMPPANIC,  "Kernel panic on temperature trip"},
 };

 static void print_status(int flags)
 {
 	int wdiof = 0;

 	if (flags == WDIOS_UNKNOWN) {
 		printf("Unknown status error from WDIOC_GETSTATUS\n");
 		return;
 	}

 	for (wdiof = 0; wdiof < WDIOF_NUM_STATUS; wdiof++) {
 		if (flags & wdiof_status[wdiof].flag)
 			printf("Support/Status: %s\n",
 				wdiof_status[wdiof].status_str);
 	}
 }

 #define WDIOF_NUM_BOOTSTATUS 7

 static const struct wdiof_status wdiof_bootstatus[WDIOF_NUM_BOOTSTATUS] = {
 	{WDIOF_OVERHEAT, "Reset due to CPU overheat"},
 	{WDIOF_FANFAULT, "Fan failed"},
 	{WDIOF_EXTERN1, "External relay 1"},
 	{WDIOF_EXTERN2, "External relay 2"},
 	{WDIOF_POWERUNDER, "Power bad/power fault"},
 	{WDIOF_CARDRESET, "Card previously reset the CPU"},
 	{WDIOF_POWEROVER,  "Power over voltage"},
 };

 static void print_boot_status(int flags)
 {
 	int wdiof = 0;

 	if (flags == WDIOF_UNKNOWN) {
 		printf("Unknown flag error from WDIOC_GETBOOTSTATUS\n");
 		return;
 	}

 	if (flags == 0) {
 		printf("Last boot is caused by: Power-On-Reset\n");
 		return;
 	}

 	for (wdiof = 0; wdiof < WDIOF_NUM_BOOTSTATUS; wdiof++) {
 		if (flags & wdiof_bootstatus[wdiof].flag)
 			printf("Last boot is caused by: %s\n",
 				wdiof_bootstatus[wdiof].status_str);
 	}
 }

 int main(int argc, char *argv[])
 {
 	int flags;
 	unsigned int ping_rate = DEFAULT_PING_RATE;
 	int ret;
 	int c;
 	int oneshot = 0;
 	char *file = "/dev/watchdog";
 	struct watchdog_info info;
 	int temperature;

 	setbuf(stdout, NULL);

 	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
 		if (c == 'f')
 			file = optarg;
 	}

 	fd = open(file, O_WRONLY);

 	if (fd == -1) {
 		if (errno == ENOENT)
 			printf("Watchdog device (%s) not found.\n", file);
 		else if (errno == EACCES)
 			printf("Run watchdog as root.\n");
 		else
 			printf("Watchdog device open failed %s\n",
 				strerror(errno));
 		exit(-1);
 	}

 	/*
 	 * Validate that `file` is a watchdog device
 	 */
 	ret = ioctl(fd, WDIOC_GETSUPPORT, &info);
 	if (ret) {
 		printf("WDIOC_GETSUPPORT error '%s'\n", strerror(errno));
 		close(fd);
 		exit(ret);
 	}

 	optind = 0;

 	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
 		switch (c) {
 		case 'b':
 			flags = 0;
 			oneshot = 1;
 			ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
 			if (!ret)
 				print_boot_status(flags);
 			else
 				printf("WDIOC_GETBOOTSTATUS error '%s'\n", strerror(errno));
 			break;
 		case 'd':
 			flags = WDIOS_DISABLECARD;
 			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
 			if (!ret)
 				printf("Watchdog card disabled.\n");
 			else {
 				printf("WDIOS_DISABLECARD error '%s'\n", strerror(errno));
 				oneshot = 1;
 			}
 			break;
 		case 'e':
 			flags = WDIOS_ENABLECARD;
 			ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
 			if (!ret)
 				printf("Watchdog card enabled.\n");
 			else {
 				printf("WDIOS_ENABLECARD error '%s'\n", strerror(errno));
 				oneshot = 1;
 			}
 			break;
 		case 'p':
 			ping_rate = strtoul(optarg, NULL, 0);
 			if (!ping_rate)
 				ping_rate = DEFAULT_PING_RATE;
 			printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
 			break;
 		case 's':
 			flags = 0;
 			oneshot = 1;
 			ret = ioctl(fd, WDIOC_GETSTATUS, &flags);
 			if (!ret)
 				print_status(flags);
 			else
 				printf("WDIOC_GETSTATUS error '%s'\n", strerror(errno));
 			ret = ioctl(fd, WDIOC_GETTEMP, &temperature);
 			if (ret)
 				printf("WDIOC_GETTEMP: '%s'\n", strerror(errno));
 			else
 				printf("Temperature %d\n", temperature);

 			break;
 		case 't':
 			flags = strtoul(optarg, NULL, 0);
 			ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
 			if (!ret)
 				printf("Watchdog timeout set to %u seconds.\n", flags);
 			else {
 				printf("WDIOC_SETTIMEOUT error '%s'\n", strerror(errno));
 				oneshot = 1;
 			}
 			break;
 		case 'T':
 			oneshot = 1;
 			ret = ioctl(fd, WDIOC_GETTIMEOUT, &flags);
 			if (!ret)
 				printf("WDIOC_GETTIMEOUT returns %u seconds.\n", flags);
 			else
 				printf("WDIOC_GETTIMEOUT error '%s'\n", strerror(errno));
 			break;
 		case 'n':
 			flags = strtoul(optarg, NULL, 0);
 			ret = ioctl(fd, WDIOC_SETPRETIMEOUT, &flags);
 			if (!ret)
 				printf("Watchdog pretimeout set to %u seconds.\n", flags);
 			else {
 				printf("WDIOC_SETPRETIMEOUT error '%s'\n", strerror(errno));
 				oneshot = 1;
 			}
 			break;
 		case 'N':
 			oneshot = 1;
 			ret = ioctl(fd, WDIOC_GETPRETIMEOUT, &flags);
 			if (!ret)
 				printf("WDIOC_GETPRETIMEOUT returns %u seconds.\n", flags);
 			else
 				printf("WDIOC_GETPRETIMEOUT error '%s'\n", strerror(errno));
 			break;
 		case 'L':
 			oneshot = 1;
 			ret = ioctl(fd, WDIOC_GETTIMELEFT, &flags);
 			if (!ret)
 				printf("WDIOC_GETTIMELEFT returns %u seconds.\n", flags);
 			else
 				printf("WDIOC_GETTIMELEFT error '%s'\n", strerror(errno));
 			break;
 		case 'f':
 			/* Handled above */
 			break;
 		case 'i':
 			/*
 			 * watchdog_info was obtained as part of file open
 			 * validation. So we just show it here.
 			 */
 			oneshot = 1;
 			printf("watchdog_info:\n");
 			printf(" identity:\t\t%s\n", info.identity);
 			printf(" firmware_version:\t%u\n",
 			       info.firmware_version);
 			print_status(info.options);
 			break;

 		default:
 			usage(argv[0]);
 			goto end;
 		}
 	}

 	if (oneshot)
 		goto end;

 	printf("Watchdog Ticking Away!\n");

 	/*
 	 * Register the signals
 	 */
 	signal(SIGINT, term);
 	signal(SIGTERM, term);
 	signal(SIGKILL, term);
 	signal(SIGQUIT, term);

 	while (1) {
 		keep_alive();
 		sleep(ping_rate);
 	}
 end:
 	/*
 	 * Send specific magic character 'V' just in case Magic Close is
 	 * enabled to ensure watchdog gets disabled on close.
 	 */
 	ret = write(fd, &v, 1);
 	if (ret < 0)
 		printf("Stopping watchdog ticks failed (%d)...\n", errno);
 	close(fd);
 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Watchdog Driver Test Program
	* - Tests all ioctls
	* - Tests Magic Close - CONFIG_WATCHDOG_NOWAYOUT
	* - Could be tested against softdog driver on systems that
	* don't have watchdog hardware.
	* - TODO:
	* - Enhance test to add coverage for WDIOC_GETTEMP.
	*
	* Reference: Documentation/watchdog/watchdog-api.rst
	*/

	#include <errno.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <fcntl.h>
	#include <signal.h>
	#include <getopt.h>
	#include <sys/ioctl.h>
	#include <linux/types.h>
	#include <linux/watchdog.h>

	#define DEFAULT_PING_RATE 1

	int fd;
	const char v = 'V';
	static const char sopts[] = "bdehp:st:Tn:NLf:i";
	static const struct option lopts[] = {
	{"bootstatus", no_argument, NULL, 'b'},
	{"disable", no_argument, NULL, 'd'},
	{"enable", no_argument, NULL, 'e'},
	{"help", no_argument, NULL, 'h'},
	{"pingrate", required_argument, NULL, 'p'},
	{"status", no_argument, NULL, 's'},
	{"timeout", required_argument, NULL, 't'},
	{"gettimeout", no_argument, NULL, 'T'},
	{"pretimeout", required_argument, NULL, 'n'},
	{"getpretimeout", no_argument, NULL, 'N'},
	{"gettimeleft", no_argument, NULL, 'L'},
	{"file", required_argument, NULL, 'f'},
	{"info", no_argument, NULL, 'i'},
	{NULL, no_argument, NULL, 0x0}
	};

	/*
	* This function simply sends an IOCTL to the driver, which in turn ticks
	* the PC Watchdog card to reset its internal timer so it doesn't trigger
	* a computer reset.
	*/
	static void keep_alive(void)
	{
	int dummy;
	int ret;

	ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
	if (!ret)
	printf(".");
	}

	/*
	* The main program. Run the program with "-d" to disable the card,
	* or "-e" to enable the card.
	*/

	static void term(int sig)
	{
	int ret = write(fd, &v, 1);

	close(fd);
	if (ret < 0)
	printf("\nStopping watchdog ticks failed (%d)...\n", errno);
	else
	printf("\nStopping watchdog ticks...\n");
	exit(0);
	}

	static void usage(char *progname)
	{
	printf("Usage: %s [options]\n", progname);
	printf(" -f, --file\t\tOpen watchdog device file\n");
	printf("\t\t\tDefault is /dev/watchdog\n");
	printf(" -i, --info\t\tShow watchdog_info\n");
	printf(" -s, --status\t\tGet status & supported features\n");
	printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n");
	printf(" -d, --disable\t\tTurn off the watchdog timer\n");
	printf(" -e, --enable\t\tTurn on the watchdog timer\n");
	printf(" -h, --help\t\tPrint the help message\n");
	printf(" -p, --pingrate=P\tSet ping rate to P seconds (default %d)\n",
	DEFAULT_PING_RATE);
	printf(" -t, --timeout=T\tSet timeout to T seconds\n");
	printf(" -T, --gettimeout\tGet the timeout\n");
	printf(" -n, --pretimeout=T\tSet the pretimeout to T seconds\n");
	printf(" -N, --getpretimeout\tGet the pretimeout\n");
	printf(" -L, --gettimeleft\tGet the time left until timer expires\n");
	printf("\n");
	printf("Parameters are parsed left-to-right in real-time.\n");
	printf("Example: %s -d -t 10 -p 5 -e\n", progname);
	printf("Example: %s -t 12 -T -n 7 -N\n", progname);
	}

	struct wdiof_status {
	int flag;
	const char *status_str;
	};

	#define WDIOF_NUM_STATUS 8

	static const struct wdiof_status wdiof_status[WDIOF_NUM_STATUS] = {
	{WDIOF_SETTIMEOUT, "Set timeout (in seconds)"},
	{WDIOF_MAGICCLOSE, "Supports magic close char"},
	{WDIOF_PRETIMEOUT, "Pretimeout (in seconds), get/set"},
	{WDIOF_ALARMONLY, "Watchdog triggers a management or other external alarm not a reboot"},
	{WDIOF_KEEPALIVEPING, "Keep alive ping reply"},
	{WDIOS_DISABLECARD, "Turn off the watchdog timer"},
	{WDIOS_ENABLECARD, "Turn on the watchdog timer"},
	{WDIOS_TEMPPANIC, "Kernel panic on temperature trip"},
	};

	static void print_status(int flags)
	{
	int wdiof = 0;

	if (flags == WDIOS_UNKNOWN) {
	printf("Unknown status error from WDIOC_GETSTATUS\n");
	return;
	}

	for (wdiof = 0; wdiof < WDIOF_NUM_STATUS; wdiof++) {
	if (flags & wdiof_status[wdiof].flag)
	printf("Support/Status: %s\n",
	wdiof_status[wdiof].status_str);
	}
	}

	#define WDIOF_NUM_BOOTSTATUS 7

	static const struct wdiof_status wdiof_bootstatus[WDIOF_NUM_BOOTSTATUS] = {
	{WDIOF_OVERHEAT, "Reset due to CPU overheat"},
	{WDIOF_FANFAULT, "Fan failed"},
	{WDIOF_EXTERN1, "External relay 1"},
	{WDIOF_EXTERN2, "External relay 2"},
	{WDIOF_POWERUNDER, "Power bad/power fault"},
	{WDIOF_CARDRESET, "Card previously reset the CPU"},
	{WDIOF_POWEROVER, "Power over voltage"},
	};

	static void print_boot_status(int flags)
	{
	int wdiof = 0;

	if (flags == WDIOF_UNKNOWN) {
	printf("Unknown flag error from WDIOC_GETBOOTSTATUS\n");
	return;
	}

	if (flags == 0) {
	printf("Last boot is caused by: Power-On-Reset\n");
	return;
	}

	for (wdiof = 0; wdiof < WDIOF_NUM_BOOTSTATUS; wdiof++) {
	if (flags & wdiof_bootstatus[wdiof].flag)
	printf("Last boot is caused by: %s\n",
	wdiof_bootstatus[wdiof].status_str);
	}
	}

	int main(int argc, char *argv[])
	{
	int flags;
	unsigned int ping_rate = DEFAULT_PING_RATE;
	int ret;
	int c;
	int oneshot = 0;
	char *file = "/dev/watchdog";
	struct watchdog_info info;
	int temperature;

	setbuf(stdout, NULL);

	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
	if (c == 'f')
	file = optarg;
	}

	fd = open(file, O_WRONLY);

	if (fd == -1) {
	if (errno == ENOENT)
	printf("Watchdog device (%s) not found.\n", file);
	else if (errno == EACCES)
	printf("Run watchdog as root.\n");
	else
	printf("Watchdog device open failed %s\n",
	strerror(errno));
	exit(-1);
	}

	/*
	* Validate that `file` is a watchdog device
	*/
	ret = ioctl(fd, WDIOC_GETSUPPORT, &info);
	if (ret) {
	printf("WDIOC_GETSUPPORT error '%s'\n", strerror(errno));
	close(fd);
	exit(ret);
	}

	optind = 0;

	while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
	switch (c) {
	case 'b':
	flags = 0;
	oneshot = 1;
	ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
	if (!ret)
	print_boot_status(flags);
	else
	printf("WDIOC_GETBOOTSTATUS error '%s'\n", strerror(errno));
	break;
	case 'd':
	flags = WDIOS_DISABLECARD;
	ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
	if (!ret)
	printf("Watchdog card disabled.\n");
	else {
	printf("WDIOS_DISABLECARD error '%s'\n", strerror(errno));
	oneshot = 1;
	}
	break;
	case 'e':
	flags = WDIOS_ENABLECARD;
	ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
	if (!ret)
	printf("Watchdog card enabled.\n");
	else {
	printf("WDIOS_ENABLECARD error '%s'\n", strerror(errno));
	oneshot = 1;
	}
	break;
	case 'p':
	ping_rate = strtoul(optarg, NULL, 0);
	if (!ping_rate)
	ping_rate = DEFAULT_PING_RATE;
	printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
	break;
	case 's':
	flags = 0;
	oneshot = 1;
	ret = ioctl(fd, WDIOC_GETSTATUS, &flags);
	if (!ret)
	print_status(flags);
	else
	printf("WDIOC_GETSTATUS error '%s'\n", strerror(errno));
	ret = ioctl(fd, WDIOC_GETTEMP, &temperature);
	if (ret)
	printf("WDIOC_GETTEMP: '%s'\n", strerror(errno));
	else
	printf("Temperature %d\n", temperature);

	break;
	case 't':
	flags = strtoul(optarg, NULL, 0);
	ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
	if (!ret)
	printf("Watchdog timeout set to %u seconds.\n", flags);
	else {
	printf("WDIOC_SETTIMEOUT error '%s'\n", strerror(errno));
	oneshot = 1;
	}
	break;
	case 'T':
	oneshot = 1;
	ret = ioctl(fd, WDIOC_GETTIMEOUT, &flags);
	if (!ret)
	printf("WDIOC_GETTIMEOUT returns %u seconds.\n", flags);
	else
	printf("WDIOC_GETTIMEOUT error '%s'\n", strerror(errno));
	break;
	case 'n':
	flags = strtoul(optarg, NULL, 0);
	ret = ioctl(fd, WDIOC_SETPRETIMEOUT, &flags);
	if (!ret)
	printf("Watchdog pretimeout set to %u seconds.\n", flags);
	else {
	printf("WDIOC_SETPRETIMEOUT error '%s'\n", strerror(errno));
	oneshot = 1;
	}
	break;
	case 'N':
	oneshot = 1;
	ret = ioctl(fd, WDIOC_GETPRETIMEOUT, &flags);
	if (!ret)
	printf("WDIOC_GETPRETIMEOUT returns %u seconds.\n", flags);
	else
	printf("WDIOC_GETPRETIMEOUT error '%s'\n", strerror(errno));
	break;
	case 'L':
	oneshot = 1;
	ret = ioctl(fd, WDIOC_GETTIMELEFT, &flags);
	if (!ret)
	printf("WDIOC_GETTIMELEFT returns %u seconds.\n", flags);
	else
	printf("WDIOC_GETTIMELEFT error '%s'\n", strerror(errno));
	break;
	case 'f':
	/* Handled above */
	break;
	case 'i':
	/*
	* watchdog_info was obtained as part of file open
	* validation. So we just show it here.
	*/
	oneshot = 1;
	printf("watchdog_info:\n");
	printf(" identity:\t\t%s\n", info.identity);
	printf(" firmware_version:\t%u\n",
	info.firmware_version);
	print_status(info.options);
	break;

	default:
	usage(argv[0]);
	goto end;
	}
	}

	if (oneshot)
	goto end;

	printf("Watchdog Ticking Away!\n");

	/*
	* Register the signals
	*/
	signal(SIGINT, term);
	signal(SIGTERM, term);
	signal(SIGKILL, term);
	signal(SIGQUIT, term);

	while (1) {
	keep_alive();
	sleep(ping_rate);
	}
	end:
	/*
	* Send specific magic character 'V' just in case Magic Close is
	* enabled to ensure watchdog gets disabled on close.
	*/
	ret = write(fd, &v, 1);
	if (ret < 0)
	printf("Stopping watchdog ticks failed (%d)...\n", errno);
	close(fd);
	return 0;
	}