From e0e3e5b9b10dc3cdea6d7b252a88992f024a57ce Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Wed, 5 Aug 2020 19:48:44 +0200
Subject: [PATCH] UserspaceEmulator: Add the access syscall

---
 DevTools/UserspaceEmulator/Emulator.cpp | 8 ++++++++
 DevTools/UserspaceEmulator/Emulator.h   | 1 +
 2 files changed, 9 insertions(+)

diff --git a/DevTools/UserspaceEmulator/Emulator.cpp b/DevTools/UserspaceEmulator/Emulator.cpp
index 0a55d3934c..0727bf69d3 100644
--- a/DevTools/UserspaceEmulator/Emulator.cpp
+++ b/DevTools/UserspaceEmulator/Emulator.cpp
@@ -250,6 +250,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
     dbgprintf("Syscall: %s (%x)\n", Syscall::to_string((Syscall::Function)function), function);
 #endif
     switch (function) {
+    case SC_access:
+        return virt$access(arg1, arg2, arg3);
     case SC_getcwd:
         return virt$getcwd(arg1, arg2);
     case SC_ttyname:
@@ -1268,4 +1270,10 @@ int Emulator::virt$getcwd(FlatPtr buffer, size_t buffer_size)
     return rc;
 }
 
+int Emulator::virt$access(FlatPtr path, size_t path_length, int type)
+{
+    auto host_path = mmu().copy_buffer_from_vm(path, path_length);
+    return syscall(SC_access, host_path.data(), host_path.size(), type);
+}
+
 }
diff --git a/DevTools/UserspaceEmulator/Emulator.h b/DevTools/UserspaceEmulator/Emulator.h
index b6c6d7a108..d83e5270b2 100644
--- a/DevTools/UserspaceEmulator/Emulator.h
+++ b/DevTools/UserspaceEmulator/Emulator.h
@@ -77,6 +77,7 @@ private:
 
     int virt$fork();
     int virt$execve(FlatPtr);
+    int virt$access(FlatPtr, size_t, int);
     int virt$sigaction(int, FlatPtr, FlatPtr);
     int virt$sigreturn();
     int virt$get_dir_entries(int fd, FlatPtr buffer, ssize_t);