Bug in Control-d handling?

[Takashi Yano]

On Mon, 20 Jun 2022 17:59:35 +0900
Takashi Yano wrote:
> Isn't this a bug of newlib? Try following code.
> 
> #include <stdio.h>
> 
> int main()
> {
> 	printf("%d\n", getchar());
> 	printf("%d\n", feof(stdin));
> 	printf("%d\n", getchar());
> 	return 0;
> }
> 
> If you press Ctrl-D at the first getchar(), the second getchar()
> does not return EOF while it does in linux.
> 
> The following patch seems to resolve the issue.
> 
> diff --git a/newlib/libc/stdio/refill.c b/newlib/libc/stdio/refill.c
> index ccedc7af7..843163b7e 100644
> --- a/newlib/libc/stdio/refill.c
> +++ b/newlib/libc/stdio/refill.c
> @@ -47,11 +47,9 @@ __srefill_r (struct _reent * ptr,
>  
>    fp->_r = 0;			/* largely a convenience for callers */
>  
> -#ifndef __CYGWIN__
>    /* SysV does not make this test; take it out for compatibility */
>    if (fp->_flags & __SEOF)
>      return EOF;
> -#endif
>  
>    /* if not already reading, have to be reading and writing */
>    if ((fp->_flags & __SRD) == 0)
> 
> However, I am not sure what this #ifndef __CYGWIN__ is for.

Ah, I confirmed that System V (Solaris 11.4) behaves like that.
Does cygwin aim for System V compatibility???

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>