Re: [Windows] Any way to distinguish ^C Induced EOF from ^Z EOF?

=?ISO-8859-15?Q?Arne_Vajh=F8j?= <>
Sun, 11 Mar 2012 17:28:13 -0400
On 3/11/2012 4:57 PM, Jan Burse wrote:

Just running the following test program:

CtrlCRunner ctrl = new CtrlCRunner();
new Runnable() {
public void run() {
/* do nothing ! */
FileInputStream fs = new FileInputStream(;
byte[] buf = new byte[256];
for (;;) {
System.out.print("test: ");
int len =;
String str = new String(buf,0,Math.max(0,len));
System.out.println("len = "+len+", buf = "+str+", buf[0]="+buf[0]);
if ("exit".equals(str.trim())) break;

Noticed that ^C and ^Z both deliver EOF.

When pressing ^C

test: len = -1, buf = , buf[0]=0

When pressing ^Z and ENTER:

test: ^Z
len = -1, buf = , buf[0]=0

How could I distinguish the two in Java?

Best Regards

BTW: It does not happen on Linux and Mac
OS with ^C and ^D, I only see this happen
currently on Windows 7.

That type of stuff is very OS specific.

I will (again) suggest using JNI to get the specific
behavior that you desire.

Java IO is just for the 98% of cases.


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