From 991d444f7116bef16893826b46f3950f62281507 Mon Sep 17 00:00:00 2001
From: guy <guy>
Date: Tue, 4 Nov 2003 07:05:32 +0000
Subject: Add a "pcap_breakloop()" API to break out of the loop in
 "pcap_dispatch()" and "pcap_loop()".

---
 pcap-nit.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

(limited to 'pcap-nit.c')

diff --git a/pcap-nit.c b/pcap-nit.c
index 44db9af..b5fbb42 100644
--- a/pcap-nit.c
+++ b/pcap-nit.c
@@ -20,7 +20,7 @@
  */
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.49 2003-07-25 05:32:04 guy Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/pcap-nit.c,v 1.50 2003-11-04 07:05:35 guy Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -126,6 +126,26 @@ pcap_read_nit(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 	n = 0;
 	ep = bp + cc;
 	while (bp < ep) {
+		/*
+		 * Has "pcap_breakloop()" been called?
+		 * If so, return immediately - if we haven't read any
+		 * packets, clear the flag and return -2 to indicate
+		 * that we were told to break out of the loop, otherwise
+		 * leave the flag set, so that the *next* call will break
+		 * out of the loop without having read any packets, and
+		 * return the number of packets we've processed so far.
+		 */
+		if (p->break_loop) {
+			if (n == 0) {
+				p->break_loop = 0;
+				return (-2);
+			} else {
+				p->cc = ep - bp;
+				p->bp = bp;
+				return (n);
+			}
+		}
+
 		nh = (struct nit_hdr *)bp;
 		cp = bp + sizeof(*nh);
 
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