* Function call difference between cygwin and Windows
@ 2019-07-19 8:23 Biswapriyo Nath
2019-07-19 12:45 ` Václav Haisman
0 siblings, 1 reply; 2+ messages in thread
From: Biswapriyo Nath @ 2019-07-19 8:23 UTC (permalink / raw)
To: cygwin
If a function calls both cygwin and Windows functions the binary creates
extra subroutine (in assembly) for cygwin ones. Example:
* Windows function:
call cs:CreatePipe
* cygwin function:
call ioctl
ioctl proc near
jmp cs:__imp_ioctl
endp
The binary is statically compiled. Why there are extra subroutines? Is this
"by-design"? Or am I missing something?
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* Re: Function call difference between cygwin and Windows
2019-07-19 8:23 Function call difference between cygwin and Windows Biswapriyo Nath
@ 2019-07-19 12:45 ` Václav Haisman
0 siblings, 0 replies; 2+ messages in thread
From: Václav Haisman @ 2019-07-19 12:45 UTC (permalink / raw)
To: cygwin
On Fri, 19 Jul 2019 at 10:23, Biswapriyo Nath wrote:
>
> If a function calls both cygwin and Windows functions the binary creates
> extra subroutine (in assembly) for cygwin ones. Example:
>
> * Windows function:
>
> call cs:CreatePipe
>
> * cygwin function:
>
> call ioctl
>
> ioctl proc near
> jmp cs:__imp_ioctl
> endp
>
> The binary is statically compiled. Why there are extra subroutines? Is this
> "by-design"? Or am I missing something?
This is how Windows DLLs work. See also
<https://stackoverflow.com/a/22688670/341065>.
--
VH
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2019-07-19 8:23 Function call difference between cygwin and Windows Biswapriyo Nath
2019-07-19 12:45 ` Václav Haisman
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