Add pxd for mmap & friends from "sys/mman.h" covering POSIX/Linux/BSD.

Cython/Includes/posix/mman.pxd

+# http://pubs.opengroup.org/onlinepubs/009695399/basedefs/sys/mman.h.html
+
+from posix.types cimport off_t, mode_t
+
+cdef extern from "sys/mman.h" nogil:
+    enum: PROT_EXEC                 # protection bits for mmap/mprotect
+    enum: PROT_READ
+    enum: PROT_WRITE
+    enum: PROT_NONE
+
+    enum: MAP_PRIVATE               # flag bits for mmap
+    enum: MAP_SHARED
+    enum: MAP_FIXED
+    enum: MAP_ANON                  # These three are not in POSIX, but are
+    enum: MAP_ANONYMOUS             # fairly common in spelling/semantics
+    enum: MAP_STACK
+
+    enum: MAP_LOCKED                # Typically available only on Linux
+    enum: MAP_HUGETLB
+    enum: MAP_POPULATE
+    enum: MAP_NORESERVE
+    enum: MAP_GROWSDOWN
+
+    enum: MAP_NOCORE                #  Typically available only on BSD
+    enum: MAP_NOSYNC
+
+    void *mmap(void *addr, size_t Len, int prot, int flags, int fd, off_t off)
+    int   munmap(void *addr, size_t Len)
+    int   mprotect(void *addr, size_t Len, int prot)
+
+    enum: MS_ASYNC
+    enum: MS_SYNC
+    enum: MS_INVALIDATE
+    int   msync(void *addr, size_t Len, int flags)
+
+    enum: POSIX_MADV_NORMAL         # POSIX advice flags
+    enum: POSIX_MADV_SEQUENTIAL
+    enum: POSIX_MADV_RANDOM
+    enum: POSIX_MADV_WILLNEED
+    enum: POSIX_MADV_DONTNEED
+    int   posix_madvise(void *addr, size_t Len, int advice)
+
+    enum: MCL_CURRENT
+    enum: MCL_FUTURE
+    int   mlock(const void *addr, size_t Len)
+    int   munlock(const void *addr, size_t Len)
+    int   mlockall(int flags)
+    int   munlockall()
+
+    int shm_open(const char *name, int oflag, mode_t mode)
+    int shm_unlink(const char *name)
+
+    # often available
+    enum: MADV_REMOVE               # pre-POSIX advice flags; often available
+    enum: MADV_DONTFORK
+    enum: MADV_DOFORK
+    enum: MADV_HWPOISON
+    enum: MADV_MERGEABLE,
+    enum: MADV_UNMERGEABLE
+    int   madvise(void *addr, size_t Len, int advice)
+
+    # sometimes available
+    int   mincore(void *addr, size_t Len, unsigned char *vec)
+
+    # These two are Linux specific but sometimes very efficient
+    void *mremap(void *old_addr, size_t old_len, size_t new_len, int flags, ...)
+    int   remap_file_pages(void *addr, size_t Len, int prot,
+                           size_t pgoff, int flags)
+
+    # The rare but standardized typed memory option
+    enum: POSIX_TYPED_MEM_ALLOCATE
+    enum: POSIX_TYPED_MEM_ALLOCATE_CONTIG
+    enum: POSIX_TYPED_MEM_MAP_ALLOCATABLE
+    int posix_typed_mem_open(const char *name, int oflag, int tflag)
+    int posix_mem_offset(const void *addr, size_t Len, off_t *off,
+                         size_t *contig_len, int *fildes)
+
+    cdef struct posix_typed_mem_info:
+        size_t posix_tmi_length
+    int posix_typed_mem_get_info(int fildes, posix_typed_mem_info *info)