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Before we start disabling acquisition of the big process lock for
specific syscalls, make sure to document and assert that all the
lock is held during all syscalls.
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Instead of copying a Vector everytime we need to enumerate a Process'
file descriptions, we can just temporarily lock so it won't change.
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The Process::Handler type has KResultOr<FlatPtr> as its return type.
Using a different return type with an equally-sized template parameter
sort of works but breaks once that condition is no longer true, e.g.
for KResultOr<int> on x86_64.
Ideally the syscall handlers would also take FlatPtrs as their args
so we can get rid of the reinterpret_cast for the function pointer
but I didn't quite feel like cleaning that up as well.
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This API now returns a KResultOr<NonnullOwnPtr<KString>> and allocation
failures should be propagated everywhere nicely. :^)
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This patch modifies InodeWatcher to switch to a one watcher, multiple
watches architecture. The following changes have been made:
- The watch_file syscall is removed, and in its place the
create_iwatcher, iwatcher_add_watch and iwatcher_remove_watch calls
have been added.
- InodeWatcher now holds multiple WatchDescriptions for each file that
is being watched.
- The InodeWatcher file descriptor can be read from to receive events on
all watched files.
Co-authored-by: Gunnar Beutner <gunnar@beutner.name>
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