`CDMmap` (FUN)

FUNCTION CDMmap : POINTER TO BYTE

Map files or devices into memory. mmap() creates a new mapping in the virtual address space of the calling process.

InOut:

Scope	Name	Type	Comment
Return	`CDMmap`	POINTER TO BYTE	pointer to the mapped area, or MAP_FAILED if failed.
Input	`addr`	POINTER TO BYTE	Pointer to starting address for the new mapping
	`length`	`UDINT`	Number of bytes mapped
	`prot`	`DINT`	Memory protection of the mapping. It is either PROT_NONE or the bitwise OR of one or more of the following flags: PROT_EXEC: Pages may be executed PROT_READ: Pages may be read PROT_WRITE: Pages may be written PROT_NONE: Pages may not be accessed
	`flags`	`DINT`	one of the following flags MAP_SHARED: Share this mapping MAP_SHARED_VALIDATE: This flag provides the same behavior as MAP_SHARED except that MAP_SHARED mappings ignore unknown flags in flags MAP_PRIVATE: Create a private copy-on-write mapping Optional flags for mmap: See linux man page for Details
	`hFile`	`RTS_IEC_HANDLE`	File descriptor of the file to be mapped
	`offset`	`DINT`	Offset in the file (or other object) where mapping starts
	`pResult`	POINTER TO DINT	Pointer to linux errno error code, 0 is ok

CDMmap (FUN)