Handle direction argument of utcp_shutdown().

[utcp] / utcp.c

diff --git a/utcp.c b/utcp.c
index c63def15cfc7845ce324d8b2ec36f6a0455ed280..d846fb1965bd4384bef7239ae0781e08fb257d8f 100644 (file)
--- a/utcp.c
+++ b/utcp.c
@@ -1000,13 +1000,26 @@ int utcp_shutdown(struct utcp_connection *c, int dir) {
                return -1;
        }
 
-       // TODO: handle dir
-       // TODO: check that repeated calls with the same parameters should have no effect
+       if(!(dir == UTCP_SHUT_RD || dir == UTCP_SHUT_WR || dir == UTCP_SHUT_RDWR)) {
+               errno = EINVAL;
+               return -1;
+       }
+
+       // TCP does not have a provision for stopping incoming packets.
+       // The best we can do is to just ignore them.
+       if(dir == UTCP_SHUT_RD || dir == UTCP_SHUT_RDWR)
+               c->recv = NULL;
+
+       // The rest of the code deals with shutting down writes.
+       if(dir == UTCP_SHUT_RD)
+               return 0;
 
        switch(c->state) {
        case CLOSED:
-               return 0;
        case LISTEN:
+               errno = ENOTCONN;
+               return -1;
+
        case SYN_SENT:
                set_state(c, CLOSED);
                return 0;