mount / umount

Dear sirs,

I'm using, well, trying to use, the following two functions from the Libc 
unit; defined as follows:

function mount(__special_file: PChar; __dir: PChar; __fstype: PChar; __rwflag: 
Cardinal; __data: Pointer): Integer; cdecl;

function umount(__special_file: PChar): Integer; cdecl;

I'm calling mount as follows:

res:=mount('/dev/sda1','/media/flash','auto',0,nil);

but I always get res=-1 (= error)

I did it in a console application (called xmount), run in a shell as root.
Provided the /dev/sda1 and /media/flash exists, if I call mount /dev/sda1 
/media/flash I get the device mounted, while if I call my program (xmount) I 
don't, 'cause of the -1 above.
Where am I wrong?

TIA

-- 
Alberto Narduzzi
MEP SpA - Software dept.


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