From: Andreas Schwab <schwab@linux-m68k.org>
To: Adhemerval Zanella via Libc-alpha <libc-alpha@sourceware.org>
Cc: Florian Weimer <fw@deneb.enyo.de>,
Adhemerval Zanella <adhemerval.zanella@linaro.org>
Subject: Re: [PATCH 4/4] signal: Only handle on NSIG signals on signal functions (BZ #25657)
Date: Tue, 21 Apr 2020 17:05:41 +0200 [thread overview]
Message-ID: <87a734dgl6.fsf@igel.home> (raw)
In-Reply-To: <d2a9e553-f202-6cc7-c0b7-bf3f36814687@linaro.org> (Adhemerval Zanella via Libc-alpha's message of "Tue, 21 Apr 2020 11:10:48 -0300")
On Apr 21 2020, Adhemerval Zanella via Libc-alpha wrote:
> On 21/04/2020 11:07, Florian Weimer wrote:
>> * Adhemerval Zanella:
>>
>>> On 21/04/2020 10:47, Florian Weimer wrote:
>>>> * Adhemerval Zanella:
>>>>
>>>>> On 21/04/2020 10:14, Florian Weimer wrote:
>>>>> Only handle __NSIG_WORDS on linux sigsetopts.h instead of _SIGSET_NWORDS
>>>>> when manipulating sigset_t masks.
>>>>
>>>> Hmm. __NSIG_WORDS is defined like this:
>>>>
>>>>> +# define __NSIG_WORDS (_NSIG / (8 * sizeof (unsigned long int )))
>>>>
>>>> This gives us two words for _NSIG == 65. Is this correct?
>>>
>>> Two words (32-bits) for all 64-bit architectures,
>>
>> sizeof (unsigned long int) is 8 on 64-bit. 65 / (8 * 8) is 1.
>>
>> I assume that for _NSIG == 65, the signal numbers from 0 to 64 are all
>> valid and can be manipulated using sigaddset etc. This suggests to me
>> that we need three 32-bit longs and two 64-bit longs.
>
> Indeed my mistake here, I was reading the value as the required words
> the maximum accessed index.
Note that signal numbers are 1-based, and bit 0 of a signal mask is for
signal 1.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
"And now for something completely different."
next prev parent reply other threads:[~2020-04-21 15:05 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-13 19:48 [PATCH v2 1/4] nptl: Move pthread_sigmask implementation to libc Adhemerval Zanella
2020-03-13 19:48 ` [PATCH 2/4] ia64: Remove sigprocmask/sigblock objects from libpthread Adhemerval Zanella
2020-04-17 13:25 ` Adhemerval Zanella
2020-04-21 11:56 ` Florian Weimer
2020-04-21 12:06 ` Adhemerval Zanella
2020-03-13 19:48 ` [PATCH v2 3/4] linux: Use pthread_sigmask on sigprocmask Adhemerval Zanella
2020-04-17 13:25 ` Adhemerval Zanella
2020-04-21 12:01 ` Florian Weimer
2020-04-21 12:30 ` Adhemerval Zanella
2020-04-21 12:35 ` Florian Weimer
2020-04-21 13:01 ` Adhemerval Zanella
2020-03-13 19:48 ` [PATCH 4/4] signal: Only handle on NSIG signals on signal functions (BZ #25657) Adhemerval Zanella
2020-04-17 13:25 ` Adhemerval Zanella
2020-04-21 12:53 ` Florian Weimer
2020-04-21 13:11 ` Adhemerval Zanella
2020-04-21 13:14 ` Florian Weimer
2020-04-21 13:29 ` Adhemerval Zanella
2020-04-21 13:47 ` Florian Weimer
2020-04-21 14:02 ` Adhemerval Zanella
2020-04-21 14:07 ` Florian Weimer
2020-04-21 14:10 ` Adhemerval Zanella
2020-04-21 14:35 ` Florian Weimer
2020-04-21 14:36 ` Adhemerval Zanella
2020-04-21 15:05 ` Andreas Schwab [this message]
2020-04-21 17:28 ` Florian Weimer
2020-04-21 17:49 ` Adhemerval Zanella
2020-04-21 18:40 ` Andreas Schwab
2020-04-21 19:00 ` Adhemerval Zanella
2020-04-21 21:14 ` Andreas Schwab
2020-04-22 8:32 ` Florian Weimer
2020-04-22 11:34 ` Adhemerval Zanella
2020-04-17 13:25 ` [PATCH v2 1/4] nptl: Move pthread_sigmask implementation to libc Adhemerval Zanella
2020-04-21 11:50 ` Florian Weimer
2020-04-21 14:06 ` Adhemerval Zanella
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