[lldb] Fix API test for file redirection to existing files

Author: kusmour

lldb/test/API/python_api/process/io/TestProcessIO.py

@@ -99,31 +99,45 @@ def test_stdout_stderr_redirection(self):
     @expectedFlakeyLinux(bugnumber="llvm.org/pr26437")
     @skipIfDarwinEmbedded  # debugserver can't create/write files on the device
     def test_stdout_stderr_redirection_to_existing_files(self):
-        """Exercise SBLaunchInfo::AddOpenFileAction() for STDOUT and STDERR without redirecting STDIN to output files already exist."""
+        """Exercise SBLaunchInfo::AddOpenFileAction() for STDOUT and STDERR redirect to output files already exist."""
         self.setup_test()
         self.build()
         self.create_target()
-        self.write_file_with_placeholder(self.output_file)
-        self.write_file_with_placeholder(self.error_file)
-        self.redirect_stdout()
-        self.redirect_stderr()
-        self.run_process(True)
-        output = self.read_output_file_and_delete()
-        error = self.read_error_file_and_delete()
-        self.check_process_output(output, error)
 
-    def write_file_with_placeholder(self, target_file):
+        # Create the output and error files with placeholder
         placeholder = "This content should be overwritten."
         if lldb.remote_platform:
+            f = open(self.local_output_file, "w")
+            f.write(placeholder)
+            f.close()
+
+            f = open(self.local_error_file, "w")
+            f.write(placeholder)
+            f.close()
+            self.runCmd(
+                'platform put-file "{local}" "{remote}"'.format(
+                    local=self.local_output_file, remote=self.output_file
+                )
+            )
             self.runCmd(
-                'platform file write "{target}" -d "{data}"'.format(
-                    target=target_file, data=placeholder
+                'platform put-file "{local}" "{remote}"'.format(
+                    local=self.local_error_file, remote=self.error_file
                 )
             )
         else:
-            f = open(target_file, "w")
+            f = open(self.output_file, "w")
+            f.write(placeholder)
+            f.close()
+            f = open(self.error_file, "w")
             f.write(placeholder)
             f.close()
+            
+        self.redirect_stdout()
+        self.redirect_stderr()
+        self.run_process(True)
+        output = self.read_output_file_and_delete()
+        error = self.read_error_file_and_delete()
+        self.check_process_output(output, error)
 
     # target_file - path on local file system or remote file system if running remote
     # local_file - path on local system