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MMap offset parameter failing with ENOMEM error


I am having trouble with mmap using the last 'offset' parameter. I have
attached a small piece of code (and sample file) which demonstrates the
problem. Basically if the offset parameter is passed as a variable to mmap
then the call fails with an ENOMEM error. But if you pass 0 as the parameter
and then access the return address from mmap + offset - it is fine. My
question: is mmap handling the offset parameter correctly?

Usage for the program:

./a.exe <offset> <file> eg: ./a.exe 11200 index.idx

To see the address + offset work, comment out the first mmap call and return
statement and uncomment the lines below each one.

Any help appreciated.


Shane Mann
Software Engineer          Phone: +61-7-3259-2223
LeadUp Software Pty Ltd    Fax:   +61-7-3259-2259
339 Coronation Drive,      Email:
Milton, QLD, 4064          Web:

Attachment: mmap_file2.c
Description: Binary data

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