I'm working on an application using the net-snmp library (net-snmp-5.6-2). And
being curious, I took a look at the source code :-). Doing so I've mentioned
the use of errno to get information about failed calls to WinSock. For example
in snmpUDPBaseDomain.c:
...
rc = sendto(t->sock, buf, size, 0, to, sizeof(struct sockaddr));
...
if (rc < 0 && errno != EINTR) {
DEBUGMSGTL(("netsnmp_udp", "sendto error, rc %d (errno %d)\n",
rc, errno));
Having done a little bit of coding with socket interfaces on a few platforms, I
think that using errno on platforms close to UNIX is perfect but is not good on
Windows. With Windows you have to use WSAGetLastError() (and error codes that
start with WSA* e.g. WSAEINTR for EINTR) instead of errno.
As I can't find any occurrence of WSAGetLastError in the source code of
net-snmp lib, I can't think of any preprocessor-/overload- or whatever-trick to
get socket errors from something called errno.
I also checked that my knowledge about WinSock and WSAGetLastError() is correct
and found an article here:
http://msdn.microsoft.com/en-us/library/windows/desktop/ms737828%28v=vs.85%29.aspx
Is there any other trick to use errno for socket calls on Windows? Or is this a
bug?
I haven't checked every occurrence of errno, but it seems that it is mainly
used in debug message, so the bug might be of no relevance.
Regards,
Walter Schmoll
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