Sockets are now files (#3319)

* Socket support for read/write/fstat

* Sockets are now files

* Fix ssize_t for windows

* Return posix error codes in net functions

src/core/file_sys/fs.cpp

@@ -219,6 +219,18 @@ File* HandleTable::GetFile(int d) {
     return m_files.at(d);
 }
 
+File* HandleTable::GetSocket(int d) {
+    std::scoped_lock lock{m_mutex};
+    if (d < 0 || d >= m_files.size()) {
+        return nullptr;
+    }
+    auto file = m_files.at(d);
+    if (file->type != Core::FileSys::FileType::Socket) {
+        return nullptr;
+    }
+    return file;
+}
+
 File* HandleTable::GetFile(const std::filesystem::path& host_name) {
     for (auto* file : m_files) {
         if (file != nullptr && file->m_host_name == host_name) {

src/core/file_sys/fs.h

@@ -12,6 +12,10 @@
 #include "common/logging/formatter.h"
 #include "core/devices/base_device.h"
 
+namespace Libraries::Net {
+struct Socket;
+}
+
 namespace Core::FileSys {
 
 class MntPoints {
@@ -77,6 +81,7 @@ enum class FileType {
     Regular, // standard file
     Directory,
     Device,
+    Socket,
 };
 
 struct File {
@@ -88,7 +93,8 @@ struct File {
     std::vector<DirEntry> dirents;
     u32 dirents_index;
     std::mutex m_mutex;
-    std::shared_ptr<Devices::BaseDevice> device; // only valid for type == Device
+    std::shared_ptr<Devices::BaseDevice> device;    // only valid for type == Device
+    std::shared_ptr<Libraries::Net::Socket> socket; // only valid for type == Socket
 };
 
 class HandleTable {
@@ -99,6 +105,7 @@ public:
     int CreateHandle();
     void DeleteHandle(int d);
     File* GetFile(int d);
+    File* GetSocket(int d);
     File* GetFile(const std::filesystem::path& host_name);
     int GetFileDescriptor(File* file);