mmap() Limitation

["Quang Nguyen (Ngo)" <quang.nguyen@xxxxxxxxxxxx>]

Let's say I want to write files to a tape device using:

   fd = open(file, O_RDONLY);
   addr = mmap(0, size, PROT_READ, MAP_PRIVATE, fd, 0);
   writeTape(addr, size);
   close(fd);
   munmap(addr, size);
Is there a limit on how big the file be?

Should I just use read() and write()?  Isn't mmap() faster?

There's a paper called "64 Bit File Access" from the XFS site that talks
about mmap64(() and stat64().  Should I be using those 64-bit functions
instead?

Thanks,
Quang


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