UserspaceEmulator: Add support for chmod

DevTools/UserspaceEmulator/Emulator.cpp

@@ -349,6 +349,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
         return virt$dbgputstr(arg1, arg2);
     case SC_dbgputch:
         return virt$dbgputch(arg1);
+    case SC_chmod:
+        return virt$chmod(arg1, arg2, arg3);
     case SC_fchmod:
         return virt$fchmod(arg1, arg2);
     case SC_accept:
@@ -492,6 +494,12 @@ int Emulator::virt$dbgputstr(FlatPtr characters, int length)
     return 0;
 }
 
+int Emulator::virt$chmod(FlatPtr path_addr, size_t path_length, mode_t mode)
+{
+    auto path = mmu().copy_buffer_from_vm(path_addr, path_length);
+    return syscall(SC_chmod, path.data(), path.size(), mode);
+}
+
 int Emulator::virt$fchmod(int fd, mode_t mode)
 {
     return syscall(SC_fchmod, fd, mode);

DevTools/UserspaceEmulator/Emulator.h

@@ -120,6 +120,7 @@ private:
     int virt$clock_gettime(int, FlatPtr);
     int virt$dbgputstr(FlatPtr characters, int length);
     int virt$dbgputch(char);
+    int virt$chmod(FlatPtr, size_t, mode_t);
     int virt$fchmod(int, mode_t);
     int virt$listen(int, int);
     int virt$kill(pid_t, int);