How does a NP communicate with its companion FSD to add or delete connections?
When a Net Provider wishes to establish a redirection for a network resource, IFSMgr provides a DeviceIoControl interface that can be used for this purpose. The IFSMgr DeviceIoControl interface is really just a method for submitting int 21h DOS function calls to IFSMgr. The relevant int 21h calls that a Net Provider typically wants to make in this case are Int 21h, function 5F03h (Make Network Connection), and Int 21h, function 5F04h (Delete Network Connection). These calls are documented in the ‘MS-DOS Programmer’s Reference’. The main issue that needs to be addressed here is how to package these Int 21h calls. The structures needed to do this are defined in IFS.H, which is included in the Windows 95 DDK.. The Win32 DeviceIoControl() function requires a handle to a device, a control code, an input and output buffers, among other things. For IFSMGR calls, the input and output buffers are going to be win32apireq structures, as defined in IFS.H. The register fields of this structure (ar_
