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From: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
To: Jakub Wilk <jwilk@jwilk.net>
Cc: Alejandro Colomar <colomar.6.4.3@gmail.com>,
	linux-man <linux-man@vger.kernel.org>
Subject: Re: [PATCH 03/12] pthread_getcpuclockid.3: Cast 'time_t' to 'intmax_t' for printf()
Date: Mon, 14 Sep 2020 21:38:18 +0200	[thread overview]
Message-ID: <CAKgNAkgMZmVApcz4cokd-V3qBRiXdEOEV14k=NzsvykKZ-Q3og@mail.gmail.com> (raw)
In-Reply-To: <20200914085831.pdvkioetcw7fe4l7@jwilk.net>

Hi Jakub,

On Mon, 14 Sep 2020 at 10:58, Jakub Wilk <jwilk@jwilk.net> wrote:
>
> * Michael Kerrisk <mtk.manpages@gmail.com>, 2020-09-13, 07:58:
> >Casting to long is the historical practive here, and should be
> >sufficient, don't you think?
>
> It general, the practice of casting time_t to long is wrong. There are
> existing systems that have 64-bit time_t but 32-bit long.
>
> In this particular case, we're measuring CPU time, so there's
> practically no danger of overflow.

Yes, what you say makes sense.

> I'd either cast it to int (to make the code shortest and simplest) or to
> intmax_t (to be pedantically correct).

As per the patch from Alex, we'll universally move to intmax_t/uintmax_t casts.

Thanks,

Michael
-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

  reply	other threads:[~2020-09-14 19:38 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-11 23:14 [PATCH 00/12] printf() fixes Alejandro Colomar
2020-09-11 23:14 ` [PATCH 01/12] dl_iterate_phdr.3: Cast 'ElfN_Word' to 'uintmax_t' for printf() Alejandro Colomar
2020-09-12  5:52   ` Jakub Wilk
2020-09-12  8:31     ` Alejandro Colomar
2020-09-15  7:35       ` Jakub Wilk
2020-09-15  9:27         ` Alejandro Colomar
2020-09-11 23:14 ` [PATCH 02/12] malloc_hook.3: Remove unneeded cast, and print 'size_t' with "%zu" Alejandro Colomar
2020-09-13  5:46   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 03/12] pthread_getcpuclockid.3: Cast 'time_t' to 'intmax_t' for printf() Alejandro Colomar
2020-09-13  5:58   ` Michael Kerrisk (man-pages)
2020-09-13  6:05     ` Michael Kerrisk (man-pages)
2020-09-13  8:12       ` Alejandro Colomar
2020-09-13 12:04         ` Michael Kerrisk (man-pages)
2020-09-14  8:58     ` Jakub Wilk
2020-09-14 19:38       ` Michael Kerrisk (man-pages) [this message]
2020-09-11 23:14 ` [PATCH 04/12] getgrent_r.3: Cast 'gid_t' " Alejandro Colomar
2020-09-13  6:01   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 05/12] getpwent_r.3: Cast 'uid_t' " Alejandro Colomar
2020-09-13  6:01   ` Michael Kerrisk (man-pages)
2020-09-13  8:28     ` Alejandro Colomar
2020-09-13 12:04       ` Michael Kerrisk (man-pages)
2020-09-13 13:28         ` Alejandro Colomar
2020-09-13 18:11         ` Alejandro Colomar
2020-09-11 23:14 ` [PATCH 06/12] rtld-audit.7: Use "%u" rather than "%d" when printing 'unsigned int' values Alejandro Colomar
2020-09-13  5:46   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 07/12] userfaultfd.2: Use 'PRIx64' rather than "%llx" when printing 64-bit fixed-width types Alejandro Colomar
2020-09-13  5:51   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 08/12] clock_getres.2: Cast 'time_t' to 'intmax_t' for printf() and fix the length modifiers Alejandro Colomar
2020-09-12  5:55   ` Jakub Wilk
2020-09-12  8:32     ` Alejandro Colomar
2020-09-12 10:06       ` [PATCH v2 08/12] clock_getres.2: Cast 'time_t' very small,values to 'int' " Alejandro Colomar
2020-09-13  6:05         ` Michael Kerrisk (man-pages)
2020-09-14  9:11         ` Jakub Wilk
2020-09-14  9:48           ` Alejandro Colomar
2020-09-11 23:14 ` [PATCH 09/12] open_by_handle_at.2: Use "%u" rather than "%d" when printing 'unsigned int' values Alejandro Colomar
2020-09-13  5:46   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 10/12] spu_run.2: Cast 'int' to 'unsigned int' when printing with "%x" Alejandro Colomar
2020-09-12 10:29   ` Alejandro Colomar
2020-09-13  5:54     ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 11/12] mprotect.2: Use "%p" rather than casting to 'long' when printing adresses (pointer values) Alejandro Colomar
2020-09-13  5:46   ` Michael Kerrisk (man-pages)
2020-09-11 23:14 ` [PATCH 12/12] pidfd_open.2: Cast 'short' to 'unsigned int' when printing with "%x" Alejandro Colomar
2020-09-13  5:55   ` Michael Kerrisk (man-pages)
2020-09-13  8:06     ` Alejandro Colomar

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