Date: Wed, 9 Aug 2017 13:02:27 -0700 From: Bryan Drewery <bdrewery@FreeBSD.org> To: freebsd-current@freebsd.org Subject: Re: Would O_APPEND for /dev/null be possible? Message-ID: <768c55f1-6a10-868b-9cd5-6ca5f93aaca3@FreeBSD.org> In-Reply-To: <20170807213656.FwzOG%steffen@sdaoden.eu> References: <20170807213656.FwzOG%steffen@sdaoden.eu>
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From: Bryan Drewery <bdrewery@FreeBSD.org>
To: freebsd-current@freebsd.org
Message-ID: <768c55f1-6a10-868b-9cd5-6ca5f93aaca3@FreeBSD.org>
Subject: Re: Would O_APPEND for /dev/null be possible?
References: <20170807213656.FwzOG%steffen@sdaoden.eu>
In-Reply-To: <20170807213656.FwzOG%steffen@sdaoden.eu>
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On 8/7/2017 2:36 PM, Steffen Nurpmeso wrote:
> I can open a file with "a+", which, for this software, means
> "O_RDWR | O_APPEND | O_CREAT | n_O_NOFOLLOW" on Linux, Solaris and
> OpenBSD, but FreeBSD complains, i think because O_APPEND. (I
> think only because the VM does not survive resumes and other
> pauses here, which frustrated me over time. It is old VM.)
> I mean, it seems i have to sprinkle more /dev/null string
> comparisons all over the place, but i wonder whether that really
> belongs there.. for /dev/null?
> # cat uh.c
> #include <err.h>
> #include <fcntl.h>
>=20
> int main() {
> int fd;
>=20
> fd =3D open("/dev/null", O_RDWR | O_APPEND | O_CREAT | O_NOFOLL=
OW);
> if (fd =3D=3D -1)
> err(1, "open");
> return 0;
> }
> # truss ./uh
=2E..
> openat(AT_FDCWD,"/dev/null",O_RDWR|O_APPEND|O_NOFOLLOW|O_CREAT,03777776=
2520) =3D 3 (0x3)
Seems to work fine.
--=20
Regards,
Bryan Drewery
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