Implement mman.h definitions

Original Issue:

Implement the sys/mman.h definitions.

• options

  • PROT_READ
  • PROT_WRITE
  • PROT_EXEC
  • PROT_NONE

• flags

  • MAP_SHARED
  • MAP_PRIVATE
  • MAP_FAILED (implemented in bits/sys/mman.h)

• mlock and posix_madvise constants

• more

Updated:

Latest spec: https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sys_mman.h.html

Declares the following functions:

• mlock (Redox never swaps)
• mlockall (Redox never swaps)
• mmap (syscall fmap)
• mprotect
• msync
• munlock (Redox never swaps)
• munlockall (Redox never swaps)
• munmap (syscall funmap)
• posix_madvise
• posix_mem_offset
• posix_typed_mem_get_info
• posix_typed_mem_open
• shm_open (fcntl::open)
• shm_unlink (unistd::unlink)

Constants for protection options:

• PROT_EXEC
• PROT_NONE
• PROT_READ
• PROT_WRITE

Constants for flag options:

• MAP_ANON & MAP_ANONYMOUS
• MAP_FIXED
• MAP_PRIVATE
• MAP_SHARED
• MAP_FAILED

Constants for msync:

• MS_ASYNC
• MS_INVALIDATE
• MS_SYNC

Constants for mlockall:

• MCL_CURRENT
• MCL_FUTURE

Constants for posix_madvise:

• POSIX_MADV_DONTNEED change from POSIX_MADV_WONTNEED?
• POSIX_MADV_NORMAL
• POSIX_MADV_RANDOM
• POSIX_MADV_SEQUENTIAL
• POSIX_MADV_WILLNEED

Constants for posix_typed_mem_open:

• POSIX_TYPED_MEM_ALLOCATE
• POSIX_TYPED_MEM_ALLOCATE_CONTIG
• POSIX_TYPED_MEM_MAP_ALLOCATABLE

Struct:

• posix_typed_mem_info