Duplicate debug messages into syslog.

May be helpful when running detached from tty.
relan · Jul 4, 2021 · ab19b44 · ab19b44
1 parent e53fa1b
commit ab19b44
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/libexfat/log.c b/libexfat/log.c
@@ -115,12 +115,22 @@ void exfat_warn(const char* format, ...)
  */
 void exfat_debug(const char* format, ...)
 {
-	va_list ap;
+	va_list ap, aq;
+
+	va_start(ap, format);
+	va_copy(aq, ap);
 
 	fflush(stdout);
 	fputs("DEBUG: ", stderr);
-	va_start(ap, format);
 	vfprintf(stderr, format, ap);
 	va_end(ap);
 	fputs(".\n", stderr);
+
+#ifdef __ANDROID__
+	__android_log_vprint(ANDROID_LOG_DEBUG, PACKAGE, format, aq);
+#else
+	if (!isatty(STDERR_FILENO))
+		vsyslog(LOG_DEBUG, format, aq);
+#endif
+	va_end(aq);
 }