MIDI backend start procedure

1 files changed, 5 insertions, 1 deletions

diff --git a/backend.c b/backend.c
index f49bd91..2eb6fcf 100644
--- a/backend.c
+++ b/backend.c
@@ -9,7 +9,7 @@ static instance** instances = NULL;
 static size_t nchannels = 0;
 static channel** channels = NULL;
 
-channel* mm_channel(instance* i, uint64_t ident){
+channel* mm_channel(instance* i, uint64_t ident, uint8_t create){
 	size_t u;
 	for(u = 0; u < nchannels; u++){
 		if(channels[u]->instance == 0 && channels[u]->ident == ident){
@@ -17,6 +17,10 @@ channel* mm_channel(instance* i, uint64_t ident){
 		}
 	}
 
+	if(!create){
+		return NULL;
+	}
+
 	channel** new_chan = realloc(channels, (nchannels + 1) * sizeof(channel*));
 	if(!new_chan){
 		fprintf(stderr, "Failed to allocate memory\n");