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api_lib: Prevent netconn_write when sendmbox is closed #74

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api_lib: Prevent netconn_write when sendmbox is closed #74

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6 changes: 6 additions & 0 deletions src/api/api_lib.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1017,6 +1017,12 @@ netconn_write_vectors_partly(struct netconn *conn, struct netvector *vectors, u1
return ERR_VAL;
}

if (conn->flags & NETCONN_FLAG_MBOXCLOSED) {
/* don't write if closed: this might block the application task
waiting on sendmbox forever! */
return ERR_CONN;
}

/* sum up the total size */
size = 0;
for (i = 0; i < vectorcnt; i++) {
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