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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
parent f60d7e5d1f
commit b907608e46
12 changed files with 58 additions and 22 deletions
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14
Libraries/LibC/SharedBuffer.cpp
View file

@ -3,10 +3,10 @@
#include <stdio.h>
#include <unistd.h>
RefPtr<SharedBuffer> SharedBuffer::create(pid_t peer, int size)
RefPtr<SharedBuffer> SharedBuffer::create_with_size(int size)
{
void* data;
int shared_buffer_id = create_shared_buffer(peer, size, &data);
int shared_buffer_id = create_shared_buffer(size, &data);
if (shared_buffer_id < 0) {
perror("create_shared_buffer");
return nullptr;
@ -14,6 +14,16 @@ RefPtr<SharedBuffer> SharedBuffer::create(pid_t peer, int size)
return adopt(*new SharedBuffer(shared_buffer_id, size, data));
}
bool SharedBuffer::share_with(pid_t peer)
{
int ret = share_buffer_with(shared_buffer_id(), peer);
if (ret < 0) {
perror("share_buffer_with");
return false;
}
return true;
}
RefPtr<SharedBuffer> SharedBuffer::create_from_shared_buffer_id(int shared_buffer_id)
{
void* data = get_shared_buffer(shared_buffer_id);