Currently the PHC index is retrieved only through an ethtool ioctl if
the PHC is specified as an Ethernet interface. If it's a char device
such as /dev/ptp5, the phc_index will remain unpopulated. Try to infer
it from the char device's path.
This is useful when trying to determine whether multiple clocks are in
fact the same (such as /dev/ptp3 and sw1p3), just compare their PHC
index.
Signed-off-by: Vladimir Oltean <olte...@gmail.com>
---
util.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/util.c b/util.c
index 296dd59a08c1..027d694ea854 100644
--- a/util.c
+++ b/util.c
@@ -211,6 +211,16 @@ clockid_t posix_clock_open(const char *device, int
*phc_index)
/* check if device is valid phc device */
clkid = phc_open(device);
if (clkid != CLOCK_INVALID) {
+ if (!strncmp(device, "/dev/ptp", strlen("/dev/ptp"))) {
+ int r = get_ranged_int(device + strlen("/dev/ptp"),
+ phc_index, 0, 65535);
+ if (r) {
+ fprintf(stderr,
+ "failed to parse PHC index from %s\n",
+ device);
+ return -1;
+ }
+ }
return clkid;
}
/* check if device is a valid ethernet device */
--
2.25.1
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