Porting Advice

Porting the programs to other Unix systems

Use a compiler that has 64 bit off_t type

32bits only gets you as far as 4GB, which is much too small for modern disks. The programs need a 64bit off_t type.

Use a libc that supports O_LONGFILE and lseek64

These are common extensions to the file I/O API.

Check that your system supports shared MAP_ANONYMOUS mmaps

If it doesn't define MAP_ANONYMOUS, open and map /dev/zero instead. If you don't have shared anonymous maps, you can back the mmap with a file, which may be on ramdisk. If you don't have any of the above, replace the mmap and msync with writes to the reply pipe.

Peter Benie <peterb@chiark.greenend.org.uk>
Linux RAID