git-svn-id: https://profuse.googlecode.com/svn/branches/v2@201 aa027e90-d47c-11dd-86d7-074df07e0730

File/MappedFile.cpp

@@ -0,0 +1,77 @@
+#include "MappedFile.h"
+
+#include <cerrno>
+#include <sys/stat.h>
+
+using namespace File;
+
+
+MappedFile::MappedFile()
+{
+    _length = -1;
+    _address = MAP_FAILED;
+}
+
+MappedFile::MappedFile(MappedFile &mf)
+{
+    _address = mf._address;
+    _length = mf._length;
+    
+    mf._address = MAP_FAILED;
+    mf._length = -1;
+}
+
+MappedFile::MappedFile(File f, int flags)
+{
+    struct stat st;
+    
+    // close enough
+    if (f.fd() < 0)
+        throw ProFUSE::PosixException(EBADF);
+
+
+    if (::fstat(f.fd(), st) != 0)
+        throw ProFUSE::PosixException(errno);
+    
+    if (!S_ISREG(st.st_mode))
+        throw ProFUSE::PosixException(ENODEV);
+        
+    _length = st.st_size;
+    _address = ::mmap(0, _length, 
+        readOnly ? PROT_READ : PROT_READ | PROT_WRITE, 
+        MAP_FILE | MAP_SHARED, f.fd(), 0); 
+
+    if (_address == MAP_FAILED)
+        throw ProFUSE::PosixException(errno);
+}
+
+MappedFile::~MappedFile()
+{
+    close();
+}
+
+
+
+MappedFile::close()
+{
+    if (_address != MAP_FAILED)
+    {
+        void *address = _address;
+        size_t length = _length;
+        
+        _address = MAP_FAILED;
+        _length = -1;
+        
+        if (::munmap(address, length) != 0)
+            throw ProFUSE::PosixException(errno);
+    }
+}
+
+MappedFile::sync()
+{
+    if (_address != MAP_FAILED)
+    {
+        if (::msync(_address, _length, MS_SYNC) != 0)
+            throw ProFUSE::PosixException(errno);
+    }
+}