hardfault_log: move hardfault_store_ulog_filename to logger module

src/modules/logger/log_writer_file.cpp

@@ -104,18 +104,16 @@ void LogWriterFile::start_log(const char *filename)
 		}
 	}
 
-#ifdef __PX4_NUTTX
 	// register the current file with the hardfault handler: if the system crashes,
 	// the hardfault handler will append the crash log to that file on the next reboot.
 	// Note that we don't deregister it when closing the log, so that crashes after disarming
 	// are appended as well (the same holds for crashes before arming, which can be a bit misleading)
-	int ret = hardfault_store_ulog_filename(filename);
+	int ret = hardfault_store_filename(filename);
 
 	if (ret) {
 		PX4_ERR("Failed to register ULog file to the hardfault handler (%i)", ret);
 	}
 
-#endif /* __PX4_NUTTX */
 
 	PX4_INFO("Opened log file: %s", filename);
 	_should_run = true;
@@ -128,6 +126,38 @@ void LogWriterFile::start_log(const char *filename)
 	notify();
 }
 
+int LogWriterFile::hardfault_store_filename(const char *log_file)
+{
+#ifdef __PX4_NUTTX
+	int fd = open(HARDFAULT_ULOG_PATH, O_TRUNC | O_WRONLY | O_CREAT);
+
+	if (fd < 0) {
+		return -errno;
+	}
+
+	int n = strlen(log_file);
+
+	if (n >= HARDFAULT_MAX_ULOG_FILE_LEN) {
+		PX4_ERR("ULog file name too long (%s, %i>=%i)\n", log_file, n, HARDFAULT_MAX_ULOG_FILE_LEN);
+		return -EINVAL;
+	}
+
+	if (n + 1 != ::write(fd, log_file, n + 1)) {
+		close(fd);
+		return -errno;
+	}
+
+	int ret = close(fd);
+
+	if (ret != 0) {
+		return -errno;
+	}
+
+#endif /* __PX4_NUTTX */
+
+	return 0;
+}
+
 void LogWriterFile::stop_log()
 {
 	_should_run = false;