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/*
* Oracle Linux DTrace.
* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
/*
* NAME
* tick.d - perform an action at regular intervals
*
* SYNOPSIS
* sudo dtrace -s tick.d
*
* DESCRIPTION
* Use the tick probe from the profile provider to execute a block of code
* at regular intervals. In this case, this is the update of a variable
* called "i", but the clause can contain any valid D statements. The
* final value of "i" is printed in the END probe.
*
* NOTES
* - The script needs to be terminated with ctrl-C. In case the
* script is running in the background, get it to run in the
* foreground first by using the fg command and then use ctrl-C
* to terminate the process. Otherwise, typing in ctrl-C will do.
*
* - Instead of printf(), trace() can be used and vice-versa. The
* difference is that trace() does not support a format string.
*/
/*
* Initialize variable "i" to zero. This is a global variable that
* can be read and written by any probe.
*/
BEGIN
{
i = 0;
}
/*
* This probe fires every 100 milliseconds. When it fires, it updates
* variable "i" and prints the result.
*/
profile:::tick-100msec
{
printf("i = %d\n",++i);
}
/*
* Print the final result.
*/
END
{
trace(i);
}
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