From aaac0102cb0656f3c83df4d9707c6d892472ba66 Mon Sep 17 00:00:00 2001
From: Guy Harris <guy@alum.mit.edu>
Date: Tue, 13 Jul 2004 05:58:15 +0000
Subject: [PATCH] If we fail to open the output file, report the reason why.

svn path=/trunk/; revision=11371
---
 mergecap.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mergecap.c b/mergecap.c
index ac3233509e..6a798e4e3e 100644
--- a/mergecap.c
+++ b/mergecap.c
@@ -1,6 +1,6 @@
 /* Combine two dump files, either by appending or by merging by timestamp
  *
- * $Id: mergecap.c,v 1.25 2004/07/12 21:00:40 ulfl Exp $
+ * $Id: mergecap.c,v 1.26 2004/07/13 05:58:15 guy Exp $
  *
  * Written by Scott Renfro <scott@renfro.org> based on
  * editcap by Richard Sharpe and Guy Harris
@@ -13,6 +13,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <errno.h>
 #include <glib.h>
 
 #ifdef HAVE_UNISTD_H
@@ -197,10 +198,11 @@ main(int argc, char *argv[])
     /* open the outfile */
     out_file.fd = open(out_filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
   }
-    if(out_file.fd == -1) {
-      fprintf(stderr, "mergecap: couldn't open output file\n");
-      exit(1);
-    }  
+  if (out_file.fd == -1) {
+    fprintf(stderr, "mergecap: Couldn't open output file %s: %s\n",
+            out_filename, strerror(errno));
+    exit(1);
+  }  
     
   /* prepare the outfile */
   if (!merge_open_outfile(&out_file, merge_max_snapshot_length(in_file_count, in_files), &err)) {