added more meaningful exception text to unix domain sockets

Socket/Protocols/UN/ConnectedUNDatagramSocketHandle.cc

@@ -40,7 +40,7 @@ prefix_ void senf::ConnectedUNDatagramSocketProtocol::init_client() const
 {
     int sock = ::socket(PF_UNIX,SOCK_DGRAM,0);
     if (sock < 0)
-        throw SystemException();
+        throw SystemException( "Could not create socket(PF_UNIX,SOCK_DGRAM,0)" );
    fd(sock);
 }
 

Socket/Protocols/UN/UNDatagramSocketHandle.cc

@@ -41,14 +41,19 @@ prefix_ void senf::UNDatagramSocketProtocol::init_client() const
 {
     int sock = ::socket(PF_UNIX,SOCK_DGRAM,0);
     if (sock < 0)
-        throw SystemException();
+        throw SystemException( "Could not create socket(PF_UNIX,SOCK_DGRAM,0)" );
     fd(sock);
 }
 
 prefix_ void senf::UNDatagramSocketProtocol::init_client(UNSocketAddress const & address) const 
 {
     init_client();
-    clientHandle().bind(address);
+    try {
+        clientHandle().bind(address);
+    } catch (SystemException & e) {
+        e << "Could not bind to address " << address.path();
+        throw;
+    }
 }
 
 ///////////////////////////////cc.e////////////////////////////////////////

Socket/Protocols/UN/UNSocketProtocol.cc

@@ -31,6 +31,7 @@
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 #include <linux/sockios.h> // for SIOCINQ / SIOCOUTQ
+#include <senf/Utils/Logger.hh>
 #include "../../../Utils/Exception.hh"
 
 //#include "UNSocketProtocol.mpp"
@@ -41,7 +42,7 @@ prefix_ unsigned senf::UNSocketProtocol::available()
 {
     int n;
     if (::ioctl(fd(),SIOCINQ,&n) < 0)
-        throw SystemException();
+        throw SystemException("Could not call available() on UNSocket");
     return n;
 }
 
@@ -76,6 +77,7 @@ prefix_ void senf::UNSocketProtocol::check_and_unlink()
         ::unlink(una.path().c_str());
     }
     catch (SystemException & e) {
+        SENF_LOG(("UNSocketProtocol::check_and_unlink() failed; " << e.description() ));
     }
 }