This article was previously published under Q149902
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This article discusses the limitations of the Portable Operating SystemInterface (POSIX) applications on Windows NT. POSIX is a standard set byANSI/IEEE to promote source level compatibility that allows applications torun on a wide variety of systems and architectures. The POSIX interface onWindows NT strictly follows the POSIX 1003.1-1990 standards.
Following are some of the POSIX limitations:
POSIX applications only launch other POSIX applications. They can not launch DOS, OS/2, Win16 or Win32 applications.
POSIX applications can not call any Win32 APIs. They do not have any access to DDE, OLE, memory mapped files, named pipes, windows sockets and other Win32 features.
POSIX applications can not implicitly or explicitly load a Win32 DLL.
POSIX applications do not have access to any networking APIs such as pipes or sockets. They are not network aware, but they can access files over the network.
POSIX applications do not have any source level debugger support. You cannot use Windbg or the Microsoft Visual C++ debugger to debug POSIX applications on Windows NT.
For additional information, please see the following article in theMicrosoft Knowledge Base:
99361 Specifying Filenames Under the POSIX Subsystem
MSDN Development Library, "Understanding Windows NT POSIX Compatibility",by Ray Cort.