X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fao_stdio.c;h=6e1f5effde50409d1f89967381a9d5054ce8a05a;hb=2f9be009ef26e3d7539f5932d267d7a8a7bcb7eb;hp=7bc416e1cf2a35ccce874033f61bf583e2f93830;hpb=7db9d86178ecfd58cc1c17ac9fcbdcfd2f13aaec;p=fw%2Faltos

diff --git a/src/ao_stdio.c b/src/ao_stdio.c
index 7bc416e1..6e1f5eff 100644
--- a/src/ao_stdio.c
+++ b/src/ao_stdio.c
@@ -38,13 +38,14 @@ putchar(char c)
 void
 flush(void)
 {
-	stdios[ao_cur_stdio].flush();
+	if (stdios[ao_cur_stdio].flush)
+		stdios[ao_cur_stdio].flush();
 }
 
 __xdata uint8_t ao_stdin_ready;
 
 char
-getchar(void) __reentrant
+getchar(void) __reentrant __critical
 {
 	char c;
 	int8_t stdio = ao_cur_stdio;
@@ -65,7 +66,7 @@ getchar(void) __reentrant
 void
 ao_add_stdio(char (*pollchar)(void),
 	     void (*putchar)(char),
-	     void (*flush)(void))
+	     void (*flush)(void)) __reentrant
 {
 	if (ao_num_stdios == AO_NUM_STDIOS)
 		ao_panic(AO_PANIC_STDIO);