hudson.util.kinfo_proc.c Maven / Gradle / Ivy

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/*********************************************************************************
 *
 * Copyright (c) 2004-2009 Oracle Corporation.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: 
 *
 *    Kohsuke Kawaguchi
 *     
 ********************************************************************************/

/*

Shows the offsets of various fields in kinfo_proc

Execution results from my laptop
--------------------------------
% ./a.out 
kinfo_proc=492
kp_proc.p_pid=24
kp_proc.p_comm=163
kp_eproc.e_ppid=416
kp_eproc.e_pcred.p_ruid=280
kp_eproc.e_pcred.p_rgid=288
kp_eproc.e_ucred.cr_uid=304
MAXCOMLEN=16
[~/ws/hudson/main/core/src/main/java/hudson/util@longhorn]
% uname -a
Darwin longhorn.local 8.11.1 Darwin Kernel Version 8.11.1: Wed Oct 10 18:23:28 PDT 2007; root:xnu-792.25.20~1/RELEASE_I386 i386 i386
*/

#include 
#include 

#define FIELD(x) \
	printf(#x "=%d\n", ((char*)(&kp.x))-((char*)&kp));

void main() {
 	struct kinfo_proc kp;
	printf("kinfo_proc=%d\n", sizeof(kp));
	
	FIELD(kp_proc.p_pid);
	FIELD(kp_proc.p_comm);
	FIELD(kp_eproc.e_ppid);
	FIELD(kp_eproc.e_pcred.p_ruid);
	FIELD(kp_eproc.e_pcred.p_rgid);
	FIELD(kp_eproc.e_ucred.cr_uid);

	printf("MAXCOMLEN=%d\n",MAXCOMLEN);
}