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Work with the data in the segment. 6. Detach from the segment using the munmap subroutine: munmap( addr, len); The mmap services are specified by various standards and commonly used as the file-mapping interface of choice in other operating system implementations. However, the system's implementation of the mmap subroutine may differ from other implementations. The mmap subroutine incorporates the following modifications: • Mapping into the process private area is not supported. • Mappings are not implicitly unmapped.
3. 2 Mapped files with mmap When we are, in fact, mapping files, there are three more steps in the process compared with mapping memory. The steps are as follows: 1. Create a file descriptor for a file system object using: fp = open( pathname, permissions); 2. Determine the file length by using the lseek system call. For example: len = lseek(fildes, 0, 2) 3. Map the file into the process address space with the mmap subroutine. For example, to map the file for the file descriptor fp, starting at address addr, using len bytes of size, with the access permissions defined by prot and 0 bytes of offset, use a statement, such as: ptr = mmap(addr, len, prot, MAP_FILE, fp, 0) This specifies the creation of a new mapped file region by mapping the file associated with the fp file descriptor.
The process space is a 32-bit address space; that is, programs use 32-bit pointers. However, each process or interrupt handler can address only the system-wide virtual memory space (segment) whose segment IDs are in the segment register. A process can access more than 16 segments by changing registers rapidly. Chapter 2. 2 Segment Register addressing The system kernel loads some segment registers in the conventional way for all processes, implicitly providing the memory addressability needed by most processes.