DCMD_PTPD_GET_TAI_UTC

Get the offset from TAI to UTC

Synopsis:

#include <dcmd_ptpd.h>

#define DCMD_PTPD_GET_TAI_UTC_OFFSET   __DIOF(_DCMD_NET, 18, MyTAIUTCInternal )

Arguments to devctl():

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

Description:

(QNX Neutrino 7.0.4 or later) This command gets the offset from Internation Atomic Time (TAI) to Universal Coordinated Time (UTC). TAI doesn't account for leap seconds, so the offset is the number of leap seconds inserted into UTC, as reported by the master clock in the Precision Time Protocol.

Note: In order to use this command, you must specify the -K option when you start ptpd or ptpd-avb.

Input:

None.

Output:

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

typedef struct {
    uint16_t currentUtcOffset;
    uint8_t currentUtcOffsetValid;
} MyTAIUTCInternal;

The members include:

currentUtcOffset: The number of leap seconds inserted into UTC.
currentUtcOffsetValid: Nonzero if the currentUtcOffset member is valid.

Example:

See DCMD_PTPD_DELAYMS

DCMD_PTPD_GET_TAI_UTC_OFFSET