From: Brian Inglis <Brian.Inglis@SystematicSw.ab.ca>
To: cygwin@cygwin.com
Subject: Re: Bug in Control-d handling?
Date: Mon, 20 Jun 2022 13:22:36 -0600 [thread overview]
Message-ID: <3f4a8b91-a53f-201d-45e4-d1f469652b6e@SystematicSw.ab.ca> (raw)
In-Reply-To: <20220620192223.2e0a084a7c093939b1c7c8d6@nifty.ne.jp>
On 2022-06-20 04:22, Takashi Yano wrote:
> 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???
The emphasis has shifted over the years from Solaris etc. compatibility
when Sparc desktops were ubiquitous (and I switched from DJGPP to
Cygwin) to Linux etc. compatibility as PCs displaced RISC boxes.
I think ACLs were the last new feature where Solaris was considered vs
POSIX.
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
prev parent reply other threads:[~2022-06-20 19:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-19 19:08 Ken Brown
2022-06-20 8:59 ` Takashi Yano
2022-06-20 10:22 ` Takashi Yano
2022-06-20 13:24 ` Ken Brown
2022-06-20 13:53 ` Eliot Moss
2022-06-20 17:50 ` Ken Brown
2022-07-04 8:10 ` Corinna Vinschen
2022-06-20 17:12 ` Achim Gratz
2022-06-20 19:22 ` Brian Inglis [this message]
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