From c3d3baabd62916d605d97758bf0f08ccfe479e01 Mon Sep 17 00:00:00 2001
From: Arnaud Giersch <arnaud.giersch@iut-bm.univ-fcomte.fr>
Date: Thu, 1 Mar 2012 17:16:18 +0100
Subject: [PATCH] Check for the existence of input files.

And avoid an ugly backtrace+coredump when file does not exists.
---
 main.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/main.cpp b/main.cpp
index 97ab14e..89e9bec 100644
--- a/main.cpp
+++ b/main.cpp
@@ -4,6 +4,7 @@
 #include <cstring>              // strchr
 #include <iostream>
 #include <stdexcept>
+#include <unistd.h>
 #include <msg/msg.h>
 #include <xbt/log.h>
 
@@ -149,6 +150,15 @@ static bool check_for_lost_load()
     return res;
 }
 
+static void check_file_access(const std::string& name)
+{
+    if (access(name.c_str(), R_OK) != 0) {
+        std::cerr << "ERROR: cannot access to file \""
+                  << name << "\" for reading: " << strerror(errno) << "\n";
+        exit(EXIT_FAILURE_ARGS);
+    }
+}
+
 static void signal_handler(int /*sig*/)
 {
     if (!opt::exit_request) {
@@ -236,6 +246,7 @@ int main(int argc, char* argv[])
 
     // Create the platform and the application.
     XBT_DEBUG("Loading platform file...");
+    check_file_access(opt::platform_file);
     MSG_create_environment(opt::platform_file.c_str());
     XBT_DEBUG("Creating hostdata...");
     hostdata::create();
@@ -264,6 +275,7 @@ int main(int argc, char* argv[])
         }
         MY_launch_application(); // it is already opt::* aware...
     } else {
+        check_file_access(opt::deployment_file);
         MSG_launch_application(opt::deployment_file.c_str());
     }
 
-- 
2.39.5