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machine images
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subvolumes
We make use of the btrfs subvol crtime for this, and for gpt images of a
manually managed xattr, if we can.
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fork() is not async-signal-safe and calling it from the signal handler
could result in a deadlock when at_fork() handlers are called. Using
the raw clone() syscall sidesteps that problem.
The tricky part is that raise() does not work, since getpid() does not
work. Add raw_getpid() to get the real pid, and use kill() instead of
raise().
https://bugs.freedesktop.org/show_bug.cgi?id=86604
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Since the order of the first and second arguments of the raw clone() system
call is reversed on s390 and cris it needs to be invoked differently.
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definitions
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This way, we can ensure we have a more complete, up-to-date list of
capabilities around, always.
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It's only exposed to userspace since
commit 685343fc3ba61a1f6eef361b786601123db16c28
Author: Tom Gundersen <teg@jklm.no>
AuthorDate: Mon Jul 14 16:37:22 2014 +0200
Commit: David S. Miller <davem@davemloft.net>
CommitDate: Tue Jul 15 16:12:01 2014 -0700
to the kernel.
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..so make them cry and print a warning if __NR_memfd_create is not
defined. This should make syscall() fail with -ENOSYS, thus trigger a
suitable runtime error-path.
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IFLA_BRPORT_LEARNING was added in v3.10-rc4-583-g9ba18891f7,
and IFLA_BRPORT_UNICAST_FLOOD in v3.10-rc4-584-g867a59436f.
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Mips has getrandom() too, but there's just too many variants
for me too care. Either someone who cares does it, or they get
compile-time warnings with old kernel headers.
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This macro exists for MIPS since v3.17:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=42944521af97a3b25516f15f3149aec3779656dc
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We really shouldn't create fds ever that have the flag unset.
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278 is vmsplice on x86_64. 318 is what we want:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/x86/syscalls/syscall_64.tbl
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needing entropy
Doesn't require an fd, and could be a bit faster, so let's make use of
it, if it is available.
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We can simplify our code quite a bit if we explicitly check for the
ifindex being 1 on Linux as a loopback check. Apparently, this is
hardcoded on Linux on the kernel, and effectively exported to userspace
via rtnl and such, hence we should be able to rely on it.
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It was only used in readahead.
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linux/memfd.h was added linux 3.17, so it might not be widely
available for a while.
Also, check if memfd_create is defined, for the HAVE_LINUX_MEMFD_H
check to have a chance of succeeding.
Also, collapse all ifdefs for memfd-related stuff, because they
were all added together so there's no need to check separately.
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In pty.c there was both an include of our pty.h and the system installed pty.h.
The latter contains only two functions openpty and forkpty. We use neither so
I assume it was a typo and removed it. We still compile and pass all tests.
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This was added in 3.8, but we should building with 3.7 headers.
Reported by Samuli Suominen <ssuominen@gentoo.org>.
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BPF_XOR was introduced in kernel 3.7
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We don't have the correct __NR_memfd_create syscall number yet, so set it to
0xffffffff for now to prevent compile time errors.
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Unlike earlier versions, the syscall only takes 2 arguments in its
final version, not 3.
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Newer kernels export meta-information about the origin of an ifname. Respect this
from the ifname rename logic. We do not rename any interfaces that was originally
named by userspace, nor once which have already been renamed from userspace.
Moreover, we optionally do not (the default) rename interfaces which the kernel
claims to have named in a predictable way.
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Name defending is still missing.
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Now we are getting into kernel < 3.4 territory...
https://bugs.freedesktop.org/show_bug.cgi?id=80095
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We used to check if e.g. IFLA_BOND_MAX is defined and provide fallback
values in missing.h is it wasn't. But over time, various kernel
versions added IFLA_* defines, so checking for IFLA_BOND_MAX is not
enough if the kernel is new enough to have some of them but too old to
have all. In case we detect that the latest known enum value is
missing, #define most of them.
https://bugs.freedesktop.org/show_bug.cgi?id=80095
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Reported-by: Arnaud Gaboury <arnaud.gaboury@gmail.com>
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https://bugs.freedesktop.org/show_bug.cgi?id=76335
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https://bugs.freedesktop.org/show_bug.cgi?id=76335
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define for the max number of rlimits, too
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Debian Stable is still using glibc 2.13, which doesn't provide the setns().
So we detect this and provide a tiny wrapper that issues the setns syscall
towards the kernel.
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These were added to the kernel between 3.5 and 3.9, let's not require such
recent kernels (yet).
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It is nice to wrap umask handling and return convention,
but glibc's mkostemp is async-signal-safe already.
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On other archs we'll not define it so that open_tmpfile() falls back to
unguessable name + unlink.
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