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Kernel: More work towards POSIX SHM, also add ftruncate().

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This commit is contained in:
Andreas Kling 2019-04-09 01:10:00 +02:00
parent 99f3cc26c3
commit 26a06f3fcd
10 changed files with 92 additions and 1 deletions
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15
Kernel/FileSystem/FileDescriptor.cpp
View file

@ -11,6 +11,7 @@
#include <Kernel/Process.h>
#include <Kernel/Devices/BlockDevice.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/SharedMemory.h>
Retained<FileDescriptor> FileDescriptor::create(RetainPtr<Inode>&& inode)
{
@ -357,6 +358,11 @@ const char* to_string(SocketRole role)
}
}
bool FileDescriptor::is_file() const
{
return !is_tty() && !is_fifo() && !is_device() && !is_socket() && !is_shared_memory();
}
KResultOr<String> FileDescriptor::absolute_path()
{
Stopwatch sw("absolute_path");
@ -439,3 +445,12 @@ const CharacterDevice* FileDescriptor::character_device() const
{
return is_character_device() ? static_cast<const CharacterDevice*>(device()) : nullptr;
}
KResult FileDescriptor::truncate(off_t length)
{
if (is_file()) {
return m_inode->truncate(length);
}
ASSERT(is_shared_memory());
return shared_memory()->truncate(length);
}

10
Kernel/FileSystem/FileDescriptor.h
View file

@ -15,6 +15,7 @@ class MasterPTY;
class Process;
class Region;
class CharacterDevice;
class SharedMemory;
class FileDescriptor : public Retainable<FileDescriptor> {
public:
@ -85,6 +86,11 @@ public:
bool is_fifo() const { return m_fifo; }
FIFO::Direction fifo_direction() { return m_fifo_direction; }
bool is_file() const;
bool is_shared_memory() const { return m_shared_memory; }
SharedMemory* shared_memory() { return m_shared_memory.ptr(); }
const SharedMemory* shared_memory() const { return m_shared_memory.ptr(); }
ByteBuffer& generator_cache() { return m_generator_cache; }
void set_original_inode(Badge<VFS>, Retained<Inode>&& inode) { m_inode = move(inode); }
@ -92,6 +98,8 @@ public:
SocketRole socket_role() const { return m_socket_role; }
void set_socket_role(SocketRole);
KResult truncate(off_t);
private:
friend class VFS;
FileDescriptor(RetainPtr<Socket>&&, SocketRole);
@ -115,6 +123,8 @@ private:
RetainPtr<FIFO> m_fifo;
FIFO::Direction m_fifo_direction { FIFO::Neither };
RetainPtr<SharedMemory> m_shared_memory;
bool m_closed { false };
};