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