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AIX Version 4.3 Kernel and Subsystems Technical Reference, Volume 1

trcgenkt Kernel Service

Purpose

Records a trace event, including a time stamp, for a generic trace channel.

Syntax

#include <sys/types.h>
#include <sys/errno.h>
#include <sys/trchkid.h>
void trcgenkt (chan, hk_word, data_word, len, buf)
unsigned int chan, hk_word, data_word, len;
char *buf;

Parameters

chan Specifies the channel number for the trace session. This number is obtained from the trcstart subroutine.
hk_word An integer containing a hook ID and a hook type:
hk_id A hook identifier is a 12-bit value. For user programs, the hook ID can be a value from 0x010 to 0x0FF.
hk_type A 4-bit hook type. The trcgenkt service automatically records this information.
data_word Specifies a word of user-defined data.
len Specifies the length, in bytes, of the buffer identified by the buf parameter.
buf Points to a buffer of trace data. The maximum amount of trace data is 4096 bytes.

Description

The trcgenkt kernel service records a trace event if a trace session is active for the specified trace channel. If a trace session is not active, the trcgenkt service simply returns. The trcgenkt kernel service is located in pinned kernel memory.

The trcgenkt service records a trace entry consisting of an hk_word entry, a data_word entry, a variable number of bytes of trace data, and a time stamp.

Execution Environment

The trcgenkt kernel service can be called from either the process or interrupt environment.

Return Values

The trcgenkt service has no return values.

Implementation Specifics

The trcgenkt kernel service is part of Base Operating System (BOS) Runtime.

Related Information

The trace daemon.

The trcgenk kernel service.

The trcgen subroutine, trcgent subroutine, trchook subroutine, trcoff subroutine, trcon subroutine, trcstart subroutine, trcstop subroutine.

RAS Kernel Services in AIX Kernel Extensions and Device Support Programming Concepts.

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