Ftruncate doesn't incress the file size

Hi,
I'm trying to incress the file size using ftruncte, the function is not returning any error (errno = 0) but the file size still have the old size.
Any idea anyone!!!!
I'm runing my application in solaris 8 with the lates patches in E3500 server

Thanks for the reply I did found the problem. part of my code was overrating piece of memory and changing the value for the FD.
Thanks

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Ftruncate doesn't incress the file size

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