[En-Nut-Discussion] Netbuff freeing

[Ralph Mason]

I noticed a problem, a program with just these lines will crash.

UDPSOCKET* sock = NutUdpCreateSocket(1234);
NutUdpSendTo(sock,0x12345678,123,"Hello world",13);
NutUdpDestroySocket(sock);

Why does crash?  We when it cant send the Netbbuff (After querying the route
in NutIpOutput) it frees it and returns -1. Then NutUdpSendTo happily frees
it again.

However other places where it could return -1 (NutIpOutput if it cant
allocate memory) but not have freed the buffer.

So what's one to do?

I suggest that the code that creates an outgoing net buffer  should always
be responsible for freeing it. This means that calling a send function will
*never* free the buffer.


Regards
Ralph




---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.491 / Virus Database: 290 - Release Date: 18/06/2003

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.491 / Virus Database: 290 - Release Date: 18/06/2003