From d4d5c5495ef48bdd00c4d47d94996ebadbf2b906 Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Fri, 20 Nov 2009 16:06:51 +0000
Subject: [PATCH] nfc-relay: Capture ctrl-c for quitting cleanly the relay
 attack application.

---
 src/examples/nfc-relay.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/examples/nfc-relay.c b/src/examples/nfc-relay.c
index 5984387..e395bc6 100644
--- a/src/examples/nfc-relay.c
+++ b/src/examples/nfc-relay.c
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
+#include <signal.h>
 
 #include <nfc.h>
 
@@ -39,6 +40,14 @@ static byte_t abtTagRxPar[MAX_FRAME_LEN];
 static size_t szTagRxBits;
 static dev_info* pdiReader;
 static dev_info* pdiTag;
+static bool quitting=false;
+
+void intr_hdlr(void)
+{
+  printf("\nQuitting...\n");
+  quitting=true;
+  return;
+}
 
 void print_usage(char* argv[])
 {
@@ -68,6 +77,12 @@ int main(int argc,char* argv[])
     }
   }
 
+#ifdef WIN32
+  signal(SIGINT, (void (__cdecl*)(int)) intr_hdlr);
+#else
+  signal(SIGINT, (void (*)()) intr_hdlr);
+#endif
+
   // Try to open the NFC emulator device
   pdiTag = nfc_connect(NULL);
   if (pdiTag == INVALID_DEVICE_INFO)
@@ -102,7 +117,7 @@ int main(int argc,char* argv[])
   nfc_configure(pdiReader,DCO_ACCEPT_INVALID_FRAMES,true);
   printf("[+] Done, relaying frames now!\n\n");
 
-  while(true)
+  while(!quitting)
   {
     // Test if we received a frame from the reader
     if (nfc_target_receive_bits(pdiTag,abtReaderRx,&szReaderRxBits,abtReaderRxPar))