From 2c04ca926776a33d7a7471b98564e4f124fcec09 Mon Sep 17 00:00:00 2001
From: Arnout Engelen <arnouten@bzzt.net>
Date: Thu, 15 Mar 2012 20:53:25 +0000
Subject: [PATCH] Use negative return values on errors

---
 cui.cpp     | 2 +-
 nethogs.cpp | 6 +++---
 nethogs.h   | 2 +-
 packet.cpp  | 4 ++--
 4 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/cui.cpp b/cui.cpp
index d0224a8..5d9541b 100644
--- a/cui.cpp
+++ b/cui.cpp
@@ -430,7 +430,7 @@ void do_refresh()
 			}
 			else
 			{
-				forceExit("Invalid viewmode");
+				forceExit("Invalid viewmode", -1);
 			}
 			uid_t uid = curproc->getVal()->getUid();
 #ifndef NDEBUG
diff --git a/nethogs.cpp b/nethogs.cpp
index a5bed8e..53ff9ce 100644
--- a/nethogs.cpp
+++ b/nethogs.cpp
@@ -222,7 +222,7 @@ void quit_cb (int /* i */)
 	exit(0);
 }
 
-void forceExit(const char *msg, ...)
+void forceExit(const char *msg, int errcode, ...)
 {
 	if ((!tracemode)&&(!DEBUG)){
 		exit_ui();
@@ -234,7 +234,7 @@ void forceExit(const char *msg, ...)
 	va_end(argp);
 	std::cerr << std::endl;
 
-    exit(0);
+    exit(errcode);
 }
 
 static void versiondisplay(void)
@@ -331,7 +331,7 @@ int main (int argc, char** argv)
 	}
 
 	if (NEEDROOT && (getuid() != 0))
-		forceExit("You need to be root to run NetHogs!");
+		forceExit("You need to be root to run NetHogs!", -2);
 
 	char errbuf[PCAP_ERRBUF_SIZE];
 
diff --git a/nethogs.h b/nethogs.h
index a39bc16..a39d99f 100644
--- a/nethogs.h
+++ b/nethogs.h
@@ -63,7 +63,7 @@
 
 #define PROGNAME_WIDTH 512
 
-void forceExit(const char *msg, ...);
+void forceExit(const char *msg, int errcode, ...);
 
 class local_addr {
 public:
diff --git a/packet.cpp b/packet.cpp
index 35aa2d1..36e19e1 100644
--- a/packet.cpp
+++ b/packet.cpp
@@ -61,11 +61,11 @@ void getLocal (const char *device, bool tracemode)
 	struct sockaddr_in *saddr;
 
 	if((sock=socket(AF_INET, SOCK_RAW, htons(0x0806)))<0){
-		forceExit("creating socket failed while establishing local IP - are you root?");
+		forceExit("creating socket failed while establishing local IP - are you root?", -3);
 	}
 	strcpy(iFreq.ifr_name, device);
 	if(ioctl(sock, SIOCGIFADDR, &iFreq)<0){
-		forceExit("ioctl failed while establishing local IP for selected device %s. You may specify the device on the command line.", device);
+		forceExit("ioctl failed while establishing local IP for selected device %s. You may specify the device on the command line.", -4, device);
 	}
 	saddr=(struct sockaddr_in*)&iFreq.ifr_addr;
 	local_addrs = new local_addr (saddr->sin_addr.s_addr, local_addrs);