partial support for sceKernelOpen directory

src/core/file_sys/fs.cpp

@@ -53,7 +53,7 @@ int HandleTable::createHandle() {
 
     m_files.push_back(file);
 
-    return existingFilesNum + RESERVED_HANDLES  - 1;
+    return m_files.size() + RESERVED_HANDLES - 1;
 }
 void HandleTable::deleteHandle(int d) {
     std::unique_lock lock{m_mutex};
@@ -64,10 +64,10 @@ File* HandleTable::getFile(int d) {
     std::unique_lock lock{m_mutex};
     return m_files.at(d - RESERVED_HANDLES);
 }
-File* HandleTable::getFile(const std::string& real_name) {
+File* HandleTable::getFile(const std::string& host_name) {
     std::unique_lock lock{m_mutex};
     for (auto* file : m_files) {
-        if (file != nullptr && file->m_real_name == real_name) {
+        if (file != nullptr && file->m_host_name == host_name) {
             return file;
         }
     }

src/core/file_sys/fs.h

@@ -27,15 +27,17 @@ class MntPoints {
 struct File {
     std::atomic_bool isOpened;
     std::atomic_bool isDirectory;
-    std::string m_real_name;
+    std::string m_host_name;
+    std::string m_guest_name;
 };
 class HandleTable {
+  public:
     HandleTable() {}
     virtual ~HandleTable() {}
     int createHandle();
     void deleteHandle(int d);
     File* getFile(int d);
-    File* getFile(const std::string& real_name);
+    File* getFile(const std::string& host_name);
 
   private:
     std::vector<File*> m_files;

src/core/hle/error_codes.h

@@ -21,3 +21,6 @@ constexpr int SCE_VIDEO_OUT_ERROR_INVALID_EVENT_QUEUE = 0x8029000C;   // Invalid
 constexpr int SCE_VIDEO_OUT_ERROR_SLOT_OCCUPIED = 0x80290010;         // slot already used
 constexpr int SCE_VIDEO_OUT_ERROR_FLIP_QUEUE_FULL = 0x80290012;       // flip queue is full
 constexpr int SCE_VIDEO_OUT_ERROR_INVALID_OPTION = 0x8029001A;        // Invalid buffer attribute option
+
+//filesystem
+constexpr int SCE_KERNEL_ERROR_EMFILE = 0x80020018;//limit of max descriptors reached

src/core/hle/libraries/libkernel/file_system.cpp

@@ -1,6 +1,10 @@
-#include "common/log.h"
-#include "common/debug.h"
 #include "core/hle/libraries/libkernel/file_system.h"
+
+#include "common/debug.h"
+#include "common/log.h"
+#include "common/singleton.h"
+#include "core/file_sys/fs.h"
+#include "core/hle/error_codes.h"
 #include "core/hle/libraries/libs.h"
 
 namespace Core::Libraries::LibKernel {
@@ -9,6 +13,23 @@ constexpr bool log_file_fs = true;  // disable it to disable logging
 
 int PS4_SYSV_ABI sceKernelOpen(const char* path, int flags, u16 mode) {
     LOG_INFO_IF(log_file_fs, "sceKernelOpen path = {} flags = {:#x} mode = {:#x}\n", path, flags, mode);
+    bool isDirectory = (flags & SCE_KERNEL_O_DIRECTORY) != 0;
+    bool create = (flags & SCE_KERNEL_O_CREAT) != 0;
+
+    auto* h = Common::Singleton<Core::FileSys::HandleTable>::Instance();
+    auto* mnt = Common::Singleton<Core::FileSys::MntPoints>::Instance();
+
+    u32 handle = h->createHandle();
+    if (handle >= 2048) {  // max descriptor reached
+        return SCE_KERNEL_ERROR_EMFILE;
+    }
+    auto* file = h->getFile(handle);
+    if (isDirectory) {
+        file->isDirectory = true;
+        file->m_guest_name = path;
+        file->m_host_name = mnt->getHostDirectory(file->m_guest_name);
+    }
+
     return 0;
 }
 
@@ -26,4 +47,4 @@ void fileSystemSymbolsRegister(Loader::SymbolsResolver* sym) {
     LIB_FUNCTION("wuCroIGjt2g", "libScePosix", 1, "libkernel", 1, 1, posix_open);
 }
 
-} // namespace Core::Libraries::LibKernel
+}  // namespace Core::Libraries::LibKernel

src/core/hle/libraries/libkernel/file_system.h

@@ -7,6 +7,20 @@ class SymbolsResolver;
 }
 
 namespace Core::Libraries::LibKernel {
+// open flags
+constexpr u32 SCE_KERNEL_O_RDONLY = 0x0000;         // Open as read-only
+constexpr u32 SCE_KERNEL_O_WRONLY = 0x0001;         // Open as write-only
+constexpr u32 SCE_KERNEL_O_RDWR = 0x0002;           // Open for reading and writing
+constexpr u32 SCE_KERNEL_O_NONBLOCK = 0x0004;       // Perform non - blocking operation
+constexpr u32 SCE_KERNEL_O_APPEND = 0x0008;         // Write by appending to the end of the file
+constexpr u32 SCE_KERNEL_O_FSYNC = 0x0080;          // Perform synchronized writing
+constexpr u32 SCE_KERNEL_O_SYNC = 0x0080;           // Perform synchronized writing
+constexpr u32 SCE_KERNEL_O_CREAT = 0x0200;          // Create a file(overwrite if it already exists)
+constexpr u32 SCE_KERNEL_O_TRUNC = 0x0400;          // Truncate the file size to 0(discard data if it already exists)
+constexpr u32 SCE_KERNEL_O_EXCL = 0x0800;           // Error will occur if the file to create already exists
+constexpr u32 SCE_KERNEL_O_DSYNC = 0x1000;          // Perform synchronized writing of the file content
+constexpr u32 SCE_KERNEL_O_DIRECT = 0x00010000;     // Use cache as little as possible
+constexpr u32 SCE_KERNEL_O_DIRECTORY = 0x00020000;  // Error will occur if not a directory
 
 int PS4_SYSV_ABI sceKernelOpen(const char *path, int flags, /* SceKernelMode*/ u16 mode);
 
@@ -14,4 +28,4 @@ int PS4_SYSV_ABI posix_open(const char *path, int flags, /* SceKernelMode*/ u16
 
 void fileSystemSymbolsRegister(Loader::SymbolsResolver *sym);
 
-} // namespace Core::Libraries::LibKernel
+}  // namespace Core::Libraries::LibKernel