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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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