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util-linux/sys-utils/wdctl.c

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/*
* wdctl(8) - show hardware watchdog status
*
* Copyright (C) 2012 Lennart Poettering
* Copyright (C) 2012 Karel Zak <kzak@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; either version 2, or (at your option) any
* later version.
*
* 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.
*/
#include <linux/watchdog.h>
#include <sys/ioctl.h>
#include <getopt.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <assert.h>
#include "nls.h"
#include "c.h"
#include "closestream.h"
#include "optutils.h"
#include "pathnames.h"
#include "strutils.h"
#include "tt.h"
struct wdflag {
uint32_t flag;
const char *name;
const char *description;
};
static const struct wdflag wdflags[] = {
{ WDIOF_CARDRESET, "CARDRESET", N_("Card previously reset the CPU") },
{ WDIOF_EXTERN1, "EXTERN1", N_("External relay 1") },
{ WDIOF_EXTERN2, "EXTERN2", N_("External relay 2") },
{ WDIOF_FANFAULT, "FANFAULT", N_("Fan failed") },
{ WDIOF_KEEPALIVEPING, "KEEPALIVEPING", N_("Keep alive ping reply") },
{ WDIOF_MAGICCLOSE, "MAGICCLOSE", N_("Supports magic close char") },
{ WDIOF_OVERHEAT, "OVERHEAT", N_("Reset due to CPU overheat") },
{ WDIOF_POWEROVER, "POWEROVER", N_("Power over voltage") },
{ WDIOF_POWERUNDER, "POWERUNDER", N_("Power bad/power fault") },
{ WDIOF_PRETIMEOUT, "PRETIMEOUT", N_("Pretimeout (in seconds)") },
{ WDIOF_SETTIMEOUT, "SETTIMEOUT", N_("Set timeout (in seconds)") }
};
/* column names */
struct colinfo {
const char *name; /* header */
double whint; /* width hint (N < 1 is in percent of termwidth) */
int flags; /* TT_FL_* */
const char *help;
};
enum { COL_FLAG, COL_DESC, COL_STATUS, COL_BSTATUS, COL_DEVICE };
/* columns descriptions */
static struct colinfo infos[] = {
[COL_FLAG] = { "FLAG", 14, 0, N_("flag name") },
[COL_DESC] = { "DESCRIPTION", 0.1, TT_FL_TRUNC, N_("flag description") },
[COL_STATUS] = { "STATUS", 1, TT_FL_RIGHT, N_("flag status") },
[COL_BSTATUS] = { "BOOT-STATUS", 1, TT_FL_RIGHT, N_("flag boot status") },
[COL_DEVICE] = { "DEVICE", 0.1, 0, N_("watchdog device name") }
};
#define NCOLS ARRAY_SIZE(infos)
static int columns[NCOLS], ncolumns;
struct wdinfo {
char *device;
int timeout;
int timeleft;
int pretimeout;
uint32_t status;
uint32_t bstatus;
struct watchdog_info ident;
unsigned int has_timeout : 1,
has_timeleft : 1,
has_pretimeout : 1;
};
/* converts flag name to flag bit */
static long name2bit(const char *name, size_t namesz)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(wdflags); i++) {
const char *cn = wdflags[i].name;
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return wdflags[i].flag;
}
warnx(_("unknown flag: %s"), name);
return -1;
}
static int column2id(const char *name, size_t namesz)
{
size_t i;
for (i = 0; i < NCOLS; i++) {
const char *cn = infos[i].name;
if (!strncasecmp(name, cn, namesz) && !*(cn + namesz))
return i;
}
warnx(_("unknown column: %s"), name);
return -1;
}
static int get_column_id(int num)
{
assert(ARRAY_SIZE(columns) == NCOLS);
assert(num < ncolumns);
assert(columns[num] < (int) NCOLS);
return columns[num];
}
static struct colinfo *get_column_info(unsigned num)
{
return &infos[ get_column_id(num) ];
}
static void usage(FILE *out)
{
size_t i;
fputs(USAGE_HEADER, out);
fprintf(out,
_(" %s [options] [<device> ...]\n"), program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fputs(_(" -f, --flags <list> print selected flags only\n"
" -F, --noflags don't print information about flags\n"
" -I, --noident don't print watchdog identity information\n"
" -n, --noheadings don't print headings for flags table\n"
" -O, --oneline print all information on one line\n"
" -o, --output <list> output columns of the flags\n"
" -r, --raw use raw output format for flags table\n"
" -T, --notimeouts don't print watchdog timeouts\n"
" -x, --flags-only print only flags table (same as -I -T)\n"), out);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fputs(USAGE_SEPARATOR, out);
fprintf(out, _("The default device is %s.\n"), _PATH_WATCHDOG_DEV);
fputs(USAGE_SEPARATOR, out);
fputs(_("Available columns:\n"), out);
for (i = 0; i < ARRAY_SIZE(infos); i++)
fprintf(out, " %13s %s\n", infos[i].name, _(infos[i].help));
fprintf(out, USAGE_MAN_TAIL("wdctl(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void add_flag_line(struct tt *tt, struct wdinfo *wd, const struct wdflag *fl)
{
int i;
struct tt_line *line;
line = tt_add_line(tt, NULL);
if (!line) {
warn(_("failed to add line to output"));
return;
}
for (i = 0; i < ncolumns; i++) {
const char *str = NULL;
switch (get_column_id(i)) {
case COL_FLAG:
str = fl->name;
break;
case COL_DESC:
str = fl->description;
break;
case COL_STATUS:
str = wd->status & fl->flag ? "1" : "0";
break;
case COL_BSTATUS:
str = wd->bstatus & fl->flag ? "1" : "0";
break;
case COL_DEVICE:
str = wd->device;
break;
default:
break;
}
if (str)
tt_line_set_data(line, i, str);
}
}
static int show_flags(struct wdinfo *wd, int tt_flags, uint32_t wanted)
{
size_t i;
int rc = -1;
struct tt *tt;
uint32_t flags;
/* create output table */
tt = tt_new_table(tt_flags);
if (!tt) {
warn(_("failed to initialize output table"));
return -1;
}
/* define columns */
for (i = 0; i < (size_t) ncolumns; i++) {
struct colinfo *col = get_column_info(i);
if (!tt_define_column(tt, col->name, col->whint, col->flags)) {
warnx(_("failed to initialize output column"));
goto done;
}
}
/* fill-in table with data
* -- one line for each supported flag (option) */
flags = wd->ident.options;
for (i = 0; i < ARRAY_SIZE(wdflags); i++) {
if (wanted && !(wanted & wdflags[i].flag))
; /* ignore */
else if (flags & wdflags[i].flag)
add_flag_line(tt, wd, &wdflags[i]);
flags &= ~wdflags[i].flag;
}
if (flags)
warnx(_("%s: unknown flags 0x%x\n"), wd->device, flags);
tt_print_table(tt);
rc = 0;
done:
tt_free_table(tt);
return rc;
}
/*
* Warning: successfully opened watchdog has to be properly closed with magic
* close character otherwise the machine will be rebooted!
*
* Don't use err() or exit() here!
*/
static int read_watchdog(struct wdinfo *wd)
{
int fd;
sigset_t sigs, oldsigs;
assert(wd->device);
sigemptyset(&oldsigs);
sigfillset(&sigs);
sigprocmask(SIG_BLOCK, &sigs, &oldsigs);
fd = open(wd->device, O_WRONLY|O_CLOEXEC);
if (fd < 0) {
if (errno == EBUSY)
warnx(_("%s: watchdog already in use, terminating."),
wd->device);
warn(_("%s: open failed"), wd->device);
return -1;
}
if (ioctl(fd, WDIOC_GETSUPPORT, &wd->ident) < 0)
warn(_("%s: failed to get information about watchdog"), wd->device);
else {
ioctl(fd, WDIOC_GETSTATUS, &wd->status);
ioctl(fd, WDIOC_GETBOOTSTATUS, &wd->bstatus);
if (ioctl(fd, WDIOC_GETTIMEOUT, &wd->timeout) >= 0)
wd->has_timeout = 1;
if (ioctl(fd, WDIOC_GETPRETIMEOUT, &wd->pretimeout) >= 0)
wd->has_pretimeout = 1;
if (ioctl(fd, WDIOC_GETTIMELEFT, &wd->timeleft) >= 0)
wd->has_timeleft = 1;
}
for (;;) {
/* We just opened this to query the state, not to arm
* it hence use the magic close character */
static const char v = 'V';
if (write(fd, &v, 1) >= 0)
break;
if (errno != EINTR) {
warn(_("%s: failed to disarm watchdog"), wd->device);
break;
}
/* Let's try hard, since if we don't get this right
* the machine might end up rebooting. */
}
close(fd);
sigprocmask(SIG_SETMASK, &oldsigs, NULL);
return 0;
}
static void print_oneline(struct wdinfo *wd, uint32_t wanted,
int noident, int notimeouts, int noflags)
{
printf("%s:", wd->device);
if (!noident) {
printf(" VERSION=\"%x\"", wd->ident.firmware_version);
printf(" IDENTITY=");
tt_fputs_quoted((char *) wd->ident.identity, stdout);
}
if (!notimeouts) {
if (wd->has_timeout)
printf(" TIMEOUT=\"%i\"", wd->timeout);
if (wd->has_pretimeout)
printf(" PRETIMEOUT=\"%i\"", wd->pretimeout);
if (wd->has_timeleft)
printf(" TIMELEFT=\"%i\"", wd->timeleft);
}
if (!noflags) {
size_t i;
uint32_t flags = wd->ident.options;
for (i = 0; i < ARRAY_SIZE(wdflags); i++) {
const struct wdflag *fl;
if ((wanted && !(wanted & wdflags[i].flag)) ||
!(flags & wdflags[i].flag))
continue;
fl= &wdflags[i];
printf(" %s=\"%s\"", fl->name,
wd->status & fl->flag ? "1" : "0");
printf(" %s_BOOT=\"%s\"", fl->name,
wd->bstatus & fl->flag ? "1" : "0");
}
}
fputc('\n', stdout);
}
static void show_timeouts(struct wdinfo *wd)
{
if (wd->has_timeout)
printf(_("%-15s%2i seconds\n"), _("Timeout:"), wd->timeout);
if (wd->has_pretimeout)
printf(_("%-15s%2i seconds\n"), _("Pre-timeout:"), wd->pretimeout);
if (wd->has_timeleft)
printf(_("%-15s%2i seconds\n"), _("Timeleft:"), wd->timeleft);
}
int main(int argc, char *argv[])
{
struct wdinfo wd;
int c, tt_flags = 0, res = EXIT_SUCCESS, count = 0;
char noflags = 0, noident = 0, notimeouts = 0, oneline = 0;
uint32_t wanted = 0;
enum {
EXCL_NONE,
EXCL_FLAGS,
EXCL_NOFLAGS
};
int excl_flag = EXCL_NONE;
static const struct option long_opts[] = {
{ "flags", required_argument, NULL, 'f' },
{ "flags-only", no_argument, NULL, 'x' },
{ "help", no_argument, NULL, 'h' },
{ "noflags", no_argument, NULL, 'F' },
{ "noheadings", no_argument, NULL, 'n' },
{ "noident", no_argument, NULL, 'I' },
{ "notimeouts", no_argument, NULL, 'T' },
{ "output", required_argument, NULL, 'o' },
{ "oneline", no_argument, NULL, 'O' },
{ "raw", no_argument, NULL, 'r' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
while ((c = getopt_long(argc, argv,
"d:f:hFnITo:OrVx", long_opts, NULL)) != -1) {
switch(c) {
case 'o':
ncolumns = string_to_idarray(optarg,
columns, ARRAY_SIZE(columns),
column2id);
if (ncolumns < 0)
return EXIT_FAILURE;
break;
case 'f':
exclusive_option(&excl_flag, EXCL_FLAGS, "--{flags,noflags}");
if (string_to_bitmask(optarg, (unsigned long *) &wanted, name2bit) != 0)
return EXIT_FAILURE;
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'h':
usage(stdout);
case 'F':
exclusive_option(&excl_flag, EXCL_NOFLAGS, "--{flags,noflags}");
noflags = 1;
break;
case 'I':
noident = 1;
break;
case 'T':
notimeouts = 1;
break;
case 'n':
tt_flags |= TT_FL_NOHEADINGS;
break;
case 'r':
tt_flags |= TT_FL_RAW;
break;
case 'O':
oneline = 1;
break;
case 'x':
noident = 1;
notimeouts = 1;
break;
case '?':
default:
usage(stderr);
}
}
if (!ncolumns) {
/* default columns */
columns[ncolumns++] = COL_FLAG;
columns[ncolumns++] = COL_DESC;
columns[ncolumns++] = COL_STATUS;
columns[ncolumns++] = COL_BSTATUS;
}
do {
int rc;
memset(&wd, 0, sizeof(wd));
if (optind == argc)
wd.device = _PATH_WATCHDOG_DEV;
else
wd.device = argv[optind++];
if (count)
fputc('\n', stdout);
count++;
rc = read_watchdog(&wd);
if (rc) {
res = EXIT_FAILURE;
continue;
}
if (oneline) {
print_oneline(&wd, wanted, noident, notimeouts, noflags);
continue;
}
/* pretty output */
if (!noident) {
printf("%-15s%s\n", _("Device:"), wd.device);
printf(_("%-15s%s [version %x]\n"),
("Identity:"),
wd.ident.identity,
wd.ident.firmware_version);
}
if (!notimeouts)
show_timeouts(&wd);
if (!noflags)
show_flags(&wd, tt_flags, wanted);
} while (optind < argc);
return res;
}
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