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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
* syscalls1.d - show the read() system calls executed
*
* SYNOPSIS
* sudo dtrace -s syscalls1.d
*
* DESCRIPTION
* Count the read() system calls that are executed while the script
* is running. Count by the process id, the user id, the name of
* the process and the file descriptor used in the read operation.
*
* NOTES
* - This script traces the running processes and the probe fires
* if there are calls to read(). If there are no such calls, no
* output is produced.
*
* If that is the case, you can always execute a command that
* executes calls to read(). One such command is "date". It causes
* the probe to fire, but any other command that issues calls to
* read() will do.
*
* - Execute this script in the background, and type in the command,
* or run it in the foreground and type in the command in a separate
* terminal window on the same system.
*
* - 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.
*
* - Although the results of an aggregation are automatically
* printed when the tracing terminates, in this case, we want to
* control the format of the output. This is why the results are
* printed in the END probe
*/
/*
* The file descriptor used in the read() call is passed to the syscall
* and to the D probe in arg0.
*/
syscall::read:entry
{
@totals[pid,uid,execname,arg0] = count();
}
/*
* The printf() statement prints a header. The format string in the
* printa() call is optional. Here it is used to produce a table layout.
*/
END
{
printf("%8s %6s %20s %3s %5s\n","PID","UID","EXECNAME","FD","COUNT");
printa("%8d %6d %20s %3d %5@d\n",@totals);
}
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