// Log10 returns the decimal logarithm of x.
// The special cases are the same as for [Log].
func Log10(x float64) float64 {
	if haveArchLog10 {
		return archLog10(x)
	}
	return log10(x)
}

func log10(x float64) float64 {
	return Log(x) * (1 / Ln10)
}

// Log2 returns the binary logarithm of x.
// The special cases are the same as for [Log].
func Log2(x float64) float64 {
	if haveArchLog2 {
		return archLog2(x)
	}

		}
	}
}

func initLegacy() {
	// In legacy mode, logs are written to /dev/log/main
	writeFD = uintptr(open(&writePath[0], 0x1 /* O_WRONLY */, 0))
	if writeFD == 0 {
		// It is hard to do anything here. Write to stderr just
		// in case user has root on device and has run
		//	adb shell setprop log.redirect-stdio true
		msg := []byte("runtime: cannot open /dev/log/main\x00")
		write(2, unsafe.Pointer(&msg[0]), int32(len(msg)))

	logger.LogOnceIf(ctx, "kms", err, id, errKind...)
}

// LogIf is the implementation of LogIf, accessible using the Logger interface
func (l KMSLogger) LogIf(ctx context.Context, err error, errKind ...interface{}) {
	logger.LogIf(ctx, "kms", err, errKind...)

For example, let's add <a href="https://github.com/Rebilly/ReDoc/blob/master/docs/redoc-vendor-extensions.md#x-logo" class="external-link" target="_blank">ReDoc's OpenAPI extension to include a custom logo</a>.

### Normal **FastAPI**

First, write all your **FastAPI** application as normally:

```Python hl_lines="1  4  7-9"

      // expected
    }

    val logs = ShadowLog.getLogsForTag("testHttpLoggingInterceptor")
    assertThat(logs.map { it.type }).containsOnly(Log.INFO)
    assertThat(logs.map { it.msg }).containsExactly(
      "--> GET http://google.com/robots.txt",
      "<-- HTTP FAILED: java.net.UnknownHostException: shortcircuit",
    )
    // We should consider if these logs should retain Exceptions

            resultBuf.append(e.getMessage()).append("\n");
        }

        // purge job logs
        try {
            final int days = ComponentUtil.getFessConfig().getPurgeJobLogDay();
            if (days >= 0) {
                jobLogService.deleteBefore(days);
            } else {
                resultBuf.append("Skipped to purge job logs.\n");
            }
        } catch (final Exception e) {

    void log(LogLevel level, String message);

    /**
     * Logs the given message at the given log level.
     *
     * @param level the log level.
     * @param message the log message.
     * @param objects the log message parameters.
     */
    void log(LogLevel level, String message, Object... objects);

    /**
     * Logs the given message at the given log level.
     *
     * @param level the log level.

    val requestBody =
      MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addFormDataPart("title", "Square Logo")
        .addFormDataPart(
          "image",
          "logo-square.png",
          File("docs/images/logo-square.png").asRequestBody(MEDIA_TYPE_PNG),
        )
        .build()

    val request =
      Request.Builder()

```

### Testen

Sobald Sie auf <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a> gehen, werden Sie sehen, dass Ihr benutzerdefiniertes Logo verwendet wird (in diesem Beispiel das Logo von **FastAPI**):

}

// Sync implements zapcore.Core. It sends log messages with HTTP POST.
func (u *udsCore) Sync() error {
	logs := u.logsFromBuffer()
	msg, err := json.Marshal(logs)
	if err != nil {
		return fmt.Errorf("failed to sync uds log: %v", err)
	}
	resp, err := u.client.Post(u.url, "application/json", bytes.NewReader(msg))
	if err != nil {
		return fmt.Errorf("failed to send logs to uds server %v: %v", u.url, err)
	}