[Assorted-commits] SF.net SVN: assorted:[1355] cpp-commons/trunk/src/commons/mmap.h

[<yan...@us...>]

Revision: 1355
          http://assorted.svn.sourceforge.net/assorted/?rev=1355&view=rev
Author:   yangzhang
Date:     2009-04-29 05:25:41 +0000 (Wed, 29 Apr 2009)

Log Message:
-----------
added mmap abstractions

Added Paths:
-----------
    cpp-commons/trunk/src/commons/mmap.h

Added: cpp-commons/trunk/src/commons/mmap.h
===================================================================
--- cpp-commons/trunk/src/commons/mmap.h	                        (rev 0)
+++ cpp-commons/trunk/src/commons/mmap.h	2009-04-29 05:25:41 UTC (rev 1355)
@@ -0,0 +1,44 @@
+#ifndef COMMONS_MMAP_H
+#define COMMONS_MMAP_H
+
+#include <commons/check.h>
+#include <commons/closing.h>
+#include <commons/nullptr.h>
+#include <commons/files.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+
+namespace commons {
+
+enum { prot_read = PROT_READ };
+enum { map_private = MAP_PRIVATE };
+const void *map_failed = reinterpret_cast<void*>(-1);
+
+class mmapping
+{
+public:
+  explicit mmapping(const char *path)
+    : fd_(checknnegerr(open(path, O_RDONLY)))
+  {
+    len_ = file_size(fd_);
+    map_ = checkpass(mmap(nullptr, len_, prot_read, map_private, fd_, 0));
+    checkneq(map_, map_failed);
+  }
+
+  ~mmapping() { if (map_ != nullptr) check0x(munmap(map_, len_)); }
+  int fd() const { return fd_; }
+  void *get() const { return map_; }
+  size_t len() const { return len_; }
+  void release() { map_ = nullptr; fd_.release(); }
+
+private:
+  closingfd fd_;
+  size_t len_;
+  void *map_;
+};
+
+}
+
+#endif


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