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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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else is proper UTF8
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If a name was passed in as function argument, trust it, and don't do utf-8
encoding for them. Callers are obliged to check the names themselves, and
escape them in case they use anything they got from the outside world.
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As memfds are now created by proper kernel API, and not by our functions, we
can't rely on names being escaped/unescaped according to our current logic.
Thus, the only safe way is to remove the escaping and when reading names,
just escape names that are not properly encoded in UTF-8.
Also, remove assert(name) lines from the memfd creation functions, as we
explictly allow name to be NULL.
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Now, that the memfd stuff is not exported anymore, we can simplify a few
things:
Use assert() instead of assert_return(), since this is used internally
only, and we should be less permissive then.
No need to pass an allocated fd back by call-by-reference, we can just
directly return it.
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Remove the sd_ prefix from internal functions and get rid of the sd_memfd
type. As a memfd is now just a native file descriptor, we can get rid of our
own wrapper type, and also use close() and dup() on them directly.
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We now have a sd_memfd_freep helper, use it if applicable.
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We need to map sealed files as MAP_PRIVATE so far as the kernel treats
MAP_SHARED as writable mapping (you can run mprotect(PROT_WRITE) at any
time on those). However, unsealed files must be mapped as MAP_SHARED.
Otherwise, we never end up writing to the real file.
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We use memfds for sealing. Lets not bother with memfds created without
MFD_ALLOW_SEALING for now. They're equivalent to random shmem files, so
don't bother treating them as sealable memfds.
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No reason to open /dev/kdbus/control if we want memfds. memfd_create() is
always available.
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Unlike earlier versions, the syscall only takes 2 arguments in its
final version, not 3.
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Don't expose generic kernel API via libsystemd, but keep the code internal
for our own usage.
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