selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET

[ Upstream commit 76a4c8b82938bc5020b67663db41f451684bf327 ]

Previously, timestamps were printed using "%lld.%u" which is incorrect
for nanosecond values lower than 100,000,000 as they're fractional
digits, therefore leading zeros are meaningful.

This patch changes the format strings to "%lld.%09u" in order to add
leading zeros to the nanosecond value.

Fixes: 568ebc5985f5 ("ptp: add the PTP_SYS_OFFSET ioctl to the testptp program")
Fixes: 4ec54f95736f ("ptp: Fix compiler warnings in the testptp utility")
Fixes: 6ab0e475f1f3 ("Documentation: fix misc. warnings")
Signed-off-by: Alex Maftei <alex.maftei@amd.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/20230615083404.57112-1-alex.maftei@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/tools/testing/selftests/ptp/testptp.c b/tools/testing/selftests/ptp/testptp.c
index 198ad5f..cfa9562 100644 (file)
--- a/tools/testing/selftests/ptp/testptp.c
+++ b/tools/testing/selftests/ptp/testptp.c
@@ -502,11 +502,11 @@ int main(int argc, char *argv[])
                        interval = t2 - t1;
                        offset = (t2 + t1) / 2 - tp;
 
-                       printf("system time: %lld.%u\n",
+                       printf("system time: %lld.%09u\n",
                                (pct+2*i)->sec, (pct+2*i)->nsec);
-                       printf("phc    time: %lld.%u\n",
+                       printf("phc    time: %lld.%09u\n",
                                (pct+2*i+1)->sec, (pct+2*i+1)->nsec);
-                       printf("system time: %lld.%u\n",
+                       printf("system time: %lld.%09u\n",
                                (pct+2*i+2)->sec, (pct+2*i+2)->nsec);
                        printf("system/phc clock time offset is %" PRId64 " ns\n"
                               "system     clock time delay  is %" PRId64 " ns\n",