[PATCH v2] selftests: timers: Make sleep time in raw_skew configurable

[Wake Liu]

The raw_skew test currently sleeps for 120 seconds to estimate clock
drift. This is a very long time for a single test, and can cause
timeouts in automated test suites or CI systems.

Allow overriding the sleep time via a command line argument,
so it can be adjusted if needed in different environments, while
keeping the default at 120 seconds to preserve original behavior.

Also add -h/--help support to document this option.

Signed-off-by: Wake Liu <wa...@google.com>
---
 tools/testing/selftests/timers/raw_skew.c | 24 +++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/timers/raw_skew.c 
b/tools/testing/selftests/timers/raw_skew.c
index a7bae7d80916..5fff3eaf1307 100644
--- a/tools/testing/selftests/timers/raw_skew.c
+++ b/tools/testing/selftests/timers/raw_skew.c
@@ -27,6 +27,7 @@
 #include <time.h>
 #include <include/vdso/time64.h>
 #include "kselftest.h"
+#include <string.h>
 
 #define shift_right(x, s) ({           \
        __typeof__(x) __x = (x);        \
@@ -87,11 +88,30 @@ void get_monotonic_and_raw(struct timespec *mon, struct 
timespec *raw)
        }
 }
 
+static void usage(char *argv0)
+{
+       printf("Usage: %s [sleep_secs]\n", argv0);
+       printf("  sleep_secs: time to sleep in seconds to estimate clock drift 
(default: 120s)\n");
+}
+
 int main(int argc, char **argv)
 {
        struct timespec mon, raw, start, end;
        long long delta1, delta2, interval, eppm, ppm;
        struct timex tx1, tx2;
+       int sleep_sec = 120;
+
+       if (argc > 1) {
+               if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 
0) {
+                       usage(argv[0]);
+                       ksft_exit_pass();
+               }
+               sleep_sec = atoi(argv[1]);
+               if (sleep_sec <= 0) {
+                       printf("Invalid sleep time, using default 120s\n");
+                       sleep_sec = 120;
+               }
+       }
 
        setbuf(stdout, NULL);
 
@@ -109,9 +129,9 @@ int main(int argc, char **argv)
        if (tx1.offset)
                printf("WARNING: ADJ_OFFSET in progress, this will cause 
inaccurate results\n");
 
-       printf("Estimating clock drift: ");
+       printf("Estimating clock drift (%ds): ", sleep_sec);
        fflush(stdout);
-       sleep(120);
+       sleep(sleep_sec);
 
        get_monotonic_and_raw(&mon, &raw);
        end = mon;
-- 
2.55.0.795.g602f6c329a-goog