From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
To: Libc-help <libc-help@sourceware.org>
Subject: Re: Where are SHMMIN and SHMMAX of shmget(2) defined?
Date: Mon, 12 Apr 2021 15:28:04 -0300 [thread overview]
Message-ID: <de058d75-98b5-325d-806e-11404a983164@linaro.org> (raw)
In-Reply-To: <CABrM6wkcqnEuASbuC3SoQQyFtv-fqBS=+-vYs8pgnuJyUkyKuQ@mail.gmail.com>
On 12/04/2021 14:27, Peng Yu via Libc-help wrote:
> Hi,
>
> shmget(2) mentions SHMMIN and SHMMAX.
>
> But I don't see where they are defined and what their values are. Does
> anybody know where they are defined?
>
> gcc -E -dD - <<< '#include <sys/shm.h>' | grep 'SHMMAX\|SHMMIN'
>
They are provided by the kernel headers since it is system specific
and glibc does not define them as extensions:
| $ gcc -E -dD - <<< '#include <linux/shm.h>' | grep 'SHMMAX\|SHMMIN'
| #define SHMMIN 1
| #define SHMMAX (ULONG_MAX - (1UL << 24))
prev parent reply other threads:[~2021-04-12 18:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-12 17:27 Peng Yu
2021-04-12 18:28 ` Adhemerval Zanella [this message]
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