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Re: [Qemu-devel] [PATCH] memfd: fix configure test

From: Florian Weimer
Subject: Re: [Qemu-devel] [PATCH] memfd: fix configure test
Date: Tue, 28 Nov 2017 13:06:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/28/2017 12:42 PM, Marc-André Lureau wrote:

Couldn't the declarations be put in sys/memfd.h like the man claimed
it would be for > 1y?

We discussed it. It was a typo in the manual page. There never was a <sys/memfd.h> header file:


The UAPI header is called <linux/memfd.h>.

The downside of using a separate header is that you cannot determine, using the preprocessor alone, whether the toolchain provides the memfd_create function. If we put everything in <sys/mman.h>, you can use “#ifdef MFD_CLOEXEC” to see if the definitions and declarations are there.


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