linux-kernel - [PATCH 1/2] selftests/watchdog: limit ping loop and allow configuring the number of pings

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Date: Mon,  6 May 2024 13:13:58 +0200
From: Laura Nao <laura.nao@...labora.com>
To: shuah@...nel.org
Cc: kernel@...labora.com,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	Laura Nao <laura.nao@...labora.com>
Subject: [PATCH 1/2] selftests/watchdog: limit ping loop and allow configuring the number of pings

In order to run the watchdog selftest with the kselftest runner, the
loop responsible for pinging the watchdog should be finite. This
change limits the loop to 5 iterations by default and introduces a new
'-c' option to adjust the number of pings as needed.

Signed-off-by: Laura Nao <laura.nao@...labora.com>
---
 tools/testing/selftests/watchdog/watchdog-test.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/watchdog/watchdog-test.c b/tools/testing/selftests/watchdog/watchdog-test.c
index bc71cbca0dde..786cc5a26206 100644
--- a/tools/testing/selftests/watchdog/watchdog-test.c
+++ b/tools/testing/selftests/watchdog/watchdog-test.c
@@ -24,16 +24,18 @@
 #include <linux/watchdog.h>
 
 #define DEFAULT_PING_RATE	1
+#define DEFAULT_PING_COUNT	5
 
 int fd;
 const char v = 'V';
-static const char sopts[] = "bdehp:st:Tn:NLf:i";
+static const char sopts[] = "bdehp:c: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'},
+	{"pingcount",     required_argument, NULL, 'c'},
 	{"status",              no_argument, NULL, 's'},
 	{"timeout",       required_argument, NULL, 't'},
 	{"gettimeout",          no_argument, NULL, 'T'},
@@ -90,6 +92,8 @@ static void usage(char *progname)
 	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(" -c, --pingcount=C\tSet number of pings to C (default %d)\n",
+	       DEFAULT_PING_COUNT);
 	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");
@@ -172,6 +176,7 @@ int main(int argc, char *argv[])
 {
 	int flags;
 	unsigned int ping_rate = DEFAULT_PING_RATE;
+	unsigned int ping_count = DEFAULT_PING_COUNT;
 	int ret;
 	int c;
 	int oneshot = 0;
@@ -248,6 +253,12 @@ int main(int argc, char *argv[])
 				ping_rate = DEFAULT_PING_RATE;
 			printf("Watchdog ping rate set to %u seconds.\n", ping_rate);
 			break;
+		case 'c':
+			ping_count = strtoul(optarg, NULL, 0);
+			if (!ping_count)
+				ping_count = DEFAULT_PING_COUNT;
+			printf("Number of pings set to %u.\n", ping_count);
+			break;
 		case 's':
 			flags = 0;
 			oneshot = 1;
@@ -336,9 +347,10 @@ int main(int argc, char *argv[])
 
 	signal(SIGINT, term);
 
-	while (1) {
+	while (ping_count > 0) {
 		keep_alive();
 		sleep(ping_rate);
+		ping_count--;
 	}
 end:
 	/*
-- 
2.30.2