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From: Bruno Haible <bruno@clisp.org>
To: Rich Felker <dalias@libc.org>
Cc: musl@lists.openwall.com
Subject: Re: [musl] insufficient checking in posix_spawn_file_actions_add{open,dup2}
Date: Mon, 25 Jan 2021 18:58:30 +0100	[thread overview]
Message-ID: <1697634.l5GBiYWEig@omega> (raw)
In-Reply-To: <20210125161512.GW23432@brightrain.aerifal.cx>

Rich Felker wrote:
> I'm not convinced that the standard as written
> requires any comparison against sysconf(_SC_OPEN_MAX). Is there a
> general rule somewhere that {x_MAX} in the text implies a requirement
> to use the dynamic runtime value if x_MAX is undefined but there's a
> corresponding _SC_x_MAX?

As far as I understand, [1] defines the meaning of {OPEN_MAX}, and [2]
says that {OPEN_MAX} is sysconf(_SC_OPEN_MAX).

Also, [2] says
  "sysconf(_SC_OPEN_MAX) may return different values before and after a
   call to setrlimit() which changes the RLIMIT_NOFILE soft limit."

Bruno

[1] https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/limits.h.html
[2] https://pubs.opengroup.org/onlinepubs/9699919799/functions/sysconf.html


  reply	other threads:[~2021-01-25 17:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-25  8:31 Bruno Haible
2021-01-25  8:40 ` [musl] insufficient checking in posix_spawn_file_actions_addclose Bruno Haible
2021-01-25 14:42 ` [musl] insufficient checking in posix_spawn_file_actions_add{open,dup2} Rich Felker
2021-01-25 16:07   ` Bruno Haible
2021-01-25 16:15     ` Rich Felker
2021-01-25 17:58       ` Bruno Haible [this message]
2021-01-25 19:33       ` Alexey Izbyshev
2021-01-25 19:37       ` Markus Wichmann
2021-01-25 19:48         ` Florian Weimer

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