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Kernel: Make it possible to look up FIFO's by ID.

This will be useful when implementing the /proc/PID/fd/N links where N is
a file descriptor referring to a FIFO.
This commit is contained in:
Andreas Kling 2019-04-25 13:52:07 +02:00
parent eadcf720c0
commit d5578826af
4 changed files with 43 additions and 8 deletions

View file

@ -1,15 +1,43 @@
#include <Kernel/FileSystem/FIFO.h>
#include <Kernel/Lock.h>
#include <AK/StdLibExtras.h>
#include <AK/HashTable.h>
//#define FIFO_DEBUG
Retained<FIFO> FIFO::create()
Lockable<HashTable<FIFO*>>& all_fifos()
{
return adopt(*new FIFO);
static Lockable<HashTable<FIFO*>>* s_table;
if (!s_table)
s_table = new Lockable<HashTable<FIFO*>>;
return *s_table;
}
FIFO::FIFO()
RetainPtr<FIFO> FIFO::from_fifo_id(dword id)
{
auto* ptr = reinterpret_cast<FIFO*>(id);
LOCKER(all_fifos().lock());
if (auto it = all_fifos().resource().find(ptr); it == all_fifos().resource().end())
return nullptr;
return ptr;
}
Retained<FIFO> FIFO::create(uid_t uid)
{
return adopt(*new FIFO(uid));
}
FIFO::FIFO(uid_t uid)
: m_uid(uid)
{
LOCKER(all_fifos().lock());
all_fifos().resource().set(this);
}
FIFO::~FIFO()
{
LOCKER(all_fifos().lock());
all_fifos().resource().remove(this);
}
void FIFO::open(Direction direction)

View file

@ -11,7 +11,12 @@ public:
Neither, Reader, Writer
};
static Retained<FIFO> create();
static RetainPtr<FIFO> from_fifo_id(dword);
static Retained<FIFO> create(uid_t);
~FIFO();
uid_t uid() const { return m_uid; }
void open(Direction);
void close(Direction);
@ -23,9 +28,11 @@ public:
bool can_write() const;
private:
FIFO();
explicit FIFO(uid_t);
unsigned m_writers { 0 };
unsigned m_readers { 0 };
DoubleBuffer m_buffer;
uid_t m_uid { 0 };
};

View file

@ -402,7 +402,7 @@ KResultOr<String> FileDescriptor::absolute_path()
if (is_tty())
return tty()->tty_name();
if (is_fifo())
return String::format("fifo:%x", m_fifo.ptr());
return String::format("fifo:%u", m_fifo.ptr());
if (is_device())
return String::format("device:%u,%u (%s)", m_device->major(), m_device->minor(), m_device->class_name());
if (is_socket())