add debug messages for initialization failures

ares/ares_gethostbyaddr.c

@@ -224,6 +224,7 @@ static int file_lookup(union ares_addr *addr, int family, struct hostent **host)
       switch(error) 
         {
         case ENOENT:
+        case ESRCH:
           return ARES_ENOTFOUND;
         default:
           DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n",

ares/ares_gethostbyname.c

@@ -248,6 +248,7 @@ static int file_lookup(const char *name, int family, struct hostent **host)
   FILE *fp;
   char **alias;
   int status;
+  int error;
 
 #ifdef WIN32
   char PATH_HOSTS[MAX_PATH];
@@ -280,8 +281,22 @@ static int file_lookup(const char *name, int family, struct hostent **host)
 
   fp = fopen(PATH_HOSTS, "r");
   if (!fp)
-    return ARES_ENOTFOUND;
-
+    {
+      error = ERRNO;
+      switch(error) 
+        {
+        case ENOENT:
+        case ESRCH:
+          return ARES_ENOTFOUND;
+        default:
+          DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n",
+                         error, strerror(error)));
+          DEBUGF(fprintf(stderr, "Error opening file: %s\n", 
+                         PATH_HOSTS));
+          *host = NULL;
+          return ARES_EFILE;
+        }
+    }
   while ((status = ares__get_hostent(fp, family, host)) == ARES_SUCCESS)
     {
       if (strcasecmp((*host)->h_name, name) == 0)

ares/ares_init.c

@@ -639,6 +639,7 @@ DhcpNameServer
       error = ERRNO;
       switch(error) {
       case ENOENT:
+      case ESRCH:
         status = ARES_EOF;
         break;
       default:
@@ -664,6 +665,7 @@ DhcpNameServer
         error = ERRNO;
         switch(error) {
         case ENOENT:
+        case ESRCH:
           status = ARES_EOF;
           break;
         default:
@@ -690,6 +692,7 @@ DhcpNameServer
         error = ERRNO;
         switch(error) {
         case ENOENT:
+        case ESRCH:
           status = ARES_EOF;
           break;
         default:
@@ -716,6 +719,7 @@ DhcpNameServer
         error = ERRNO;
         switch(error) {
         case ENOENT:
+        case ESRCH:
           status = ARES_EOF;
           break;
         default:

ares/ares_search.c

@@ -273,6 +273,7 @@ static int single_domain(ares_channel channel, const char *name, char **s)
               switch(error) 
                 {
                 case ENOENT:
+                case ESRCH:
                   break;
                 default:
                   DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n",