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SharedBuffer: Split the creation and share steps

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This allows us to seal a buffer *before* anyone else has access to it
(well, ok, the creating process still does, but you can't win them all).

It also means that a SharedBuffer can be shared with multiple clients:
all you need is to have access to it to share it on again.
This commit is contained in:
Robin Burchell 2019-07-18 09:52:22 +02:00 • committed by Andreas Kling
commit b907608e46
Notes: sideshowbarker 2024-07-19 13:11:27 +09:00
12 changed files with 58 additions and 22 deletions
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10
Libraries/LibC/unistd.cpp
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@ -423,9 +423,15 @@ int read_tsc(unsigned* lsw, unsigned* msw)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int create_shared_buffer(pid_t peer_pid, int size, void** buffer)
int create_shared_buffer(int size, void** buffer)
{
int rc = syscall(SC_create_shared_buffer, peer_pid, size, buffer);
int rc = syscall(SC_create_shared_buffer, size, buffer);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int share_buffer_with(int shared_buffer_id, pid_t peer_pid)
{
int rc = syscall(SC_share_buffer_with, shared_buffer_id, peer_pid);
__RETURN_WITH_ERRNO(rc, rc, -1);
}