QPID-1148 - from Manuel Tiera

Lock file abstraction in sys/ with implementation portable to Linux and Solaris.

Changes by myself:
 - Makefile.am - must be updated for any new/renamed/removed source files.
 - Exception.h, Daemon.h, LockFile.h: Replaced throwIf() with if (...) throw ErrnoException(...)

The idiom throwIf(call-system-function(), "msg", errno) is incorret
(my fault, not Manuels). It assumes the first argument that makes a
system call call will be evaluated before the last one which fetches
errno. This may not be true on some compilers/platforms.


git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@674865 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 7 insertions, 1 deletions

diff --git a/cpp/src/qpid/Exception.h b/cpp/src/qpid/Exception.h
index 1be433f17a..4e91f85ddb 100644
--- a/cpp/src/qpid/Exception.h
+++ b/cpp/src/qpid/Exception.h
@@ -28,12 +28,13 @@
 
 #include <memory>
 #include <string>
+#include <errno.h>
 
 namespace qpid
 {
 
 /** Get the error message for a system number err, e.g. errno. */
-std::string strError(int err);
+std::string strError(int err=errno);
 
 /**
  * Base class for Qpid runtime exceptions.
@@ -52,6 +53,11 @@ class Exception : public std::exception
     mutable std::string whatStr;
 };
 
+/** Exception that includes an errno message. */
+struct ErrnoException : public Exception {
+    ErrnoException(const std::string& msg, int err=errno) : Exception(msg+": "+strError(err)) {}
+};
+    
 struct SessionException : public Exception {
     const framing::ReplyCode code;
     SessionException(framing::ReplyCode code_, const std::string& message)