DCMD_PTPD

Get the peer delay and neighbor rate ratio

Synopsis:

#include <dcmd_ptpd.h>

#define DCMD_PTPD_INFO   __DIOF(_DCMD_NET, 13, MyPTPDINFOInternal )

Argument	Value
`filedes`	A file descriptor that you obtained by opening /dev/ptpd
`dcmd`	DCMD_PTPD_INFO
`dev_data_ptr`	A pointer to a MyPTPDINFOInternal structure
`n_bytes`	`sizeof(MyPTPDINFOInternal)`
`dev_info_ptr`	NULL

(QNX Neutrino 7.0 or later) This command gets information about the Precision Time Protocol.

Note: In order to use this command, you must specify the -K option when you start ptpd-avb. Note that ptpd doesn't support this command.

None.

A filled-in MyPTPDINFOInternal structure, which is defined in <dcmd_ptpd.h> as follows:

typedef struct {
	int64_t peerdelay;
	int32_t neighborrateratio;
	uint8_t	neighborrateratio_valid;
} MyPTPDINFOInternal;

The members include:

peerdelay: The delay calculated from the timestamps of messages sent between two peers.
neighborrateratio: The neighbor rate ratio, which is used to adjust for the differences in frequencies between the clocks in adjacent devices on the network.
neighborrateratio_valid: Nonzero if the neighborrateratio member is valid.