I am trying to determine the size of a file passed as a command line
argument. I am using SYS_lseek. Here is the code up to that point:
_start:
pop eax ; argc
pop eax ; program name
pop ecx ; file to convert
jecxz usage
pop eax
or eax, eax ; Too many arguments?
jne usage
; Open the file
push dword O_RDWR
push ecx
sys.open
jc cantopen
mov ebp, eax ; Save fd
; Find file size
sub eax, eax
push dword SEEK_END
push eax
push eax ; 0 bytes from eof
push ebp ; fd
sys.lseek
jc facerr
Unfortunately, the SYS_lseek returns an error (carry is set, EAX=0x16=ESPIPE).
Why? I am not creating any pipes there. The fd returned by the SYS_open
is 3, as expected, so why does SYS_lseek fail?
The sys.lseek macro does a mov eax, 199 / call kernel.function, where
kernel.function is int 80h / ret.
Adam
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