Am 02.06.2014 10:38 schrieb "Michael Schnell" <mschn...@lumino.de>: > In Windows I suppose syscalls usually are not done directly by the rtl, but functions calls to a Kernel dll are done, so that that Windows.provide dll might decide to stay in usermode if possible.
Addendum: yes, the RTL calls the core DLLs of the Win32 subsystem like kernel32.dll, but they are just that: the core DLLs of the Win32 subsystem. They don't implement any core OS functionality like hardware/device management, because that is done by the NT kernel below it which is called by the Win32 DLLs if needed using the ntdll.dll which acts as a gateway to the kernel (some calls will do a Syscall then, for example hardware related functions, while others like functions to handle list structures will stay in the current mode). That's basically a remnant of the microkernel nature of the NT OS. Regards, Sven
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