1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Watchdog Driver Test Program
4 */
5
6 #include <errno.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <unistd.h>
11 #include <fcntl.h>
12 #include <signal.h>
13 #include <getopt.h>
14 #include <sys/ioctl.h>
15 #include <linux/types.h>
16 #include <linux/watchdog.h>
17
18 #define DEFAULT_PING_RATE 1
19
20 int fd;
21 const char v = 'V';
22 static const char sopts[] = "bdehp:t:Tn:NLf:i";
23 static const struct option lopts[] = {
24 {"bootstatus", no_argument, NULL, 'b'},
25 {"disable", no_argument, NULL, 'd'},
26 {"enable", no_argument, NULL, 'e'},
27 {"help", no_argument, NULL, 'h'},
28 {"pingrate", required_argument, NULL, 'p'},
29 {"timeout", required_argument, NULL, 't'},
30 {"gettimeout", no_argument, NULL, 'T'},
31 {"pretimeout", required_argument, NULL, 'n'},
32 {"getpretimeout", no_argument, NULL, 'N'},
33 {"gettimeleft", no_argument, NULL, 'L'},
34 {"file", required_argument, NULL, 'f'},
35 {"info", no_argument, NULL, 'i'},
36 {NULL, no_argument, NULL, 0x0}
37 };
38
39 /*
40 * This function simply sends an IOCTL to the driver, which in turn ticks
41 * the PC Watchdog card to reset its internal timer so it doesn't trigger
42 * a computer reset.
43 */
keep_alive(void)44 static void keep_alive(void)
45 {
46 int dummy;
47 int ret;
48
49 ret = ioctl(fd, WDIOC_KEEPALIVE, &dummy);
50 if (!ret)
51 printf(".");
52 }
53
54 /*
55 * The main program. Run the program with "-d" to disable the card,
56 * or "-e" to enable the card.
57 */
58
term(int sig)59 static void term(int sig)
60 {
61 int ret = write(fd, &v, 1);
62
63 close(fd);
64 if (ret < 0)
65 printf("\nStopping watchdog ticks failed (%d)...\n", errno);
66 else
67 printf("\nStopping watchdog ticks...\n");
68 exit(0);
69 }
70
usage(char * progname)71 static void usage(char *progname)
72 {
73 printf("Usage: %s [options]\n", progname);
74 printf(" -f, --file\t\tOpen watchdog device file\n");
75 printf("\t\t\tDefault is /dev/watchdog\n");
76 printf(" -i, --info\t\tShow watchdog_info\n");
77 printf(" -b, --bootstatus\tGet last boot status (Watchdog/POR)\n");
78 printf(" -d, --disable\t\tTurn off the watchdog timer\n");
79 printf(" -e, --enable\t\tTurn on the watchdog timer\n");
80 printf(" -h, --help\t\tPrint the help message\n");
81 printf(" -p, --pingrate=P\tSet ping rate to P seconds (default %d)\n",
82 DEFAULT_PING_RATE);
83 printf(" -t, --timeout=T\tSet timeout to T seconds\n");
84 printf(" -T, --gettimeout\tGet the timeout\n");
85 printf(" -n, --pretimeout=T\tSet the pretimeout to T seconds\n");
86 printf(" -N, --getpretimeout\tGet the pretimeout\n");
87 printf(" -L, --gettimeleft\tGet the time left until timer expires\n");
88 printf("\n");
89 printf("Parameters are parsed left-to-right in real-time.\n");
90 printf("Example: %s -d -t 10 -p 5 -e\n", progname);
91 printf("Example: %s -t 12 -T -n 7 -N\n", progname);
92 }
93
main(int argc,char * argv[])94 int main(int argc, char *argv[])
95 {
96 int flags;
97 unsigned int ping_rate = DEFAULT_PING_RATE;
98 int ret;
99 int c;
100 int oneshot = 0;
101 char *file = "/dev/watchdog";
102 struct watchdog_info info;
103
104 setbuf(stdout, NULL);
105
106 while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
107 if (c == 'f')
108 file = optarg;
109 }
110
111 fd = open(file, O_WRONLY);
112
113 if (fd == -1) {
114 if (errno == ENOENT)
115 printf("Watchdog device (%s) not found.\n", file);
116 else if (errno == EACCES)
117 printf("Run watchdog as root.\n");
118 else
119 printf("Watchdog device open failed %s\n",
120 strerror(errno));
121 exit(-1);
122 }
123
124 /*
125 * Validate that `file` is a watchdog device
126 */
127 ret = ioctl(fd, WDIOC_GETSUPPORT, &info);
128 if (ret) {
129 printf("WDIOC_GETSUPPORT error '%s'\n", strerror(errno));
130 close(fd);
131 exit(ret);
132 }
133
134 optind = 0;
135
136 while ((c = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
137 switch (c) {
138 case 'b':
139 flags = 0;
140 oneshot = 1;
141 ret = ioctl(fd, WDIOC_GETBOOTSTATUS, &flags);
142 if (!ret)
143 printf("Last boot is caused by: %s.\n", (flags != 0) ?
144 "Watchdog" : "Power-On-Reset");
145 else
146 printf("WDIOC_GETBOOTSTATUS error '%s'\n", strerror(errno));
147 break;
148 case 'd':
149 flags = WDIOS_DISABLECARD;
150 ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
151 if (!ret)
152 printf("Watchdog card disabled.\n");
153 else {
154 printf("WDIOS_DISABLECARD error '%s'\n", strerror(errno));
155 oneshot = 1;
156 }
157 break;
158 case 'e':
159 flags = WDIOS_ENABLECARD;
160 ret = ioctl(fd, WDIOC_SETOPTIONS, &flags);
161 if (!ret)
162 printf("Watchdog card enabled.\n");
163 else {
164 printf("WDIOS_ENABLECARD error '%s'\n", strerror(errno));
165 oneshot = 1;
166 }
167 break;
168 case 'p':
169 ping_rate = strtoul(optarg, NULL, 0);
170 if (!ping_rate)
171 ping_rate = DEFAULT_PING_RATE;
172 printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
173 break;
174 case 't':
175 flags = strtoul(optarg, NULL, 0);
176 ret = ioctl(fd, WDIOC_SETTIMEOUT, &flags);
177 if (!ret)
178 printf("Watchdog timeout set to %u seconds.\n", flags);
179 else {
180 printf("WDIOC_SETTIMEOUT error '%s'\n", strerror(errno));
181 oneshot = 1;
182 }
183 break;
184 case 'T':
185 oneshot = 1;
186 ret = ioctl(fd, WDIOC_GETTIMEOUT, &flags);
187 if (!ret)
188 printf("WDIOC_GETTIMEOUT returns %u seconds.\n", flags);
189 else
190 printf("WDIOC_GETTIMEOUT error '%s'\n", strerror(errno));
191 break;
192 case 'n':
193 flags = strtoul(optarg, NULL, 0);
194 ret = ioctl(fd, WDIOC_SETPRETIMEOUT, &flags);
195 if (!ret)
196 printf("Watchdog pretimeout set to %u seconds.\n", flags);
197 else {
198 printf("WDIOC_SETPRETIMEOUT error '%s'\n", strerror(errno));
199 oneshot = 1;
200 }
201 break;
202 case 'N':
203 oneshot = 1;
204 ret = ioctl(fd, WDIOC_GETPRETIMEOUT, &flags);
205 if (!ret)
206 printf("WDIOC_GETPRETIMEOUT returns %u seconds.\n", flags);
207 else
208 printf("WDIOC_GETPRETIMEOUT error '%s'\n", strerror(errno));
209 break;
210 case 'L':
211 oneshot = 1;
212 ret = ioctl(fd, WDIOC_GETTIMELEFT, &flags);
213 if (!ret)
214 printf("WDIOC_GETTIMELEFT returns %u seconds.\n", flags);
215 else
216 printf("WDIOC_GETTIMELEFT error '%s'\n", strerror(errno));
217 break;
218 case 'f':
219 /* Handled above */
220 break;
221 case 'i':
222 /*
223 * watchdog_info was obtained as part of file open
224 * validation. So we just show it here.
225 */
226 oneshot = 1;
227 printf("watchdog_info:\n");
228 printf(" identity:\t\t%s\n", info.identity);
229 printf(" firmware_version:\t%u\n",
230 info.firmware_version);
231 printf(" options:\t\t%08x\n", info.options);
232 break;
233
234 default:
235 usage(argv[0]);
236 goto end;
237 }
238 }
239
240 if (oneshot)
241 goto end;
242
243 printf("Watchdog Ticking Away!\n");
244
245 signal(SIGINT, term);
246
247 while (1) {
248 keep_alive();
249 sleep(ping_rate);
250 }
251 end:
252 ret = write(fd, &v, 1);
253 if (ret < 0)
254 printf("Stopping watchdog ticks failed (%d)...\n", errno);
255 close(fd);
256 return 0;
257 }
258