[COMMIT master] Add try_main() for running a program under an exception handler

[Avi Kivity <avi@xxxxxxxxxx>]

From: Avi Kivity <avi@xxxxxxxxxx>

Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>

diff --git a/api/exception.cc b/api/exception.cc
index 500569a..910bdff 100644
--- a/api/exception.cc
+++ b/api/exception.cc
@@ -18,3 +18,16 @@ const char *errno_exception::what()
 		  std::strerror(_errno), _errno);
     return _buf;
 }
+
+int try_main(int (*main)(int argc, char** argv), int argc, char** argv,
+	     int ret_on_exception)
+{
+    try {
+        return main(argc, argv);
+    } catch (std::exception& e) {
+        std::fprintf(stderr, "exception: %s\n", e.what());
+    } catch (...) {
+        std::fprintf(stderr, "unknown exception\n");
+    }
+    return ret_on_exception;
+}
diff --git a/api/exception.hh b/api/exception.hh
index 4672760..f78d9a1 100644
--- a/api/exception.hh
+++ b/api/exception.hh
@@ -13,4 +13,7 @@ private:
     char _buf[1000];
 };
 
+int try_main(int (*main)(int argc, char** argv), int argc, char** argv,
+	     int ret_on_exception = 127);
+
 #endif
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