I have the most basic, simple starter sub-agent which simply outputs a
hard-coded string (for now), which works fine when compiled as a C module:
# net-snmp-config --compile-subagent Ctest sinIDENT.c
(compiles cleanly)
# ./Ctest
# snmpget -v 1 -c public localhost sinIDENT.0
# SIN-TOP-LEVEL-0::sinIDENT.0 = STRING: *ZQXA*
(all's well)
(kill Ctest)
HOWEVER, if I rename that same module to sinIDENT.cpp and compile:
# net-snmp-config --compile-subagent CppTest --cflags -lstdc++ sinIDENT.cpp
(compiles cleanly)
# ./CppTest
# snmpget -v 1 -c public localhost sinIDENT.0
*Error in packet*
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: NAVCAN-CNS-SIN-TOP-LEVEL-0::sinIDENT.0
My first thought was that there was fname mangling going on so I made sure
that the header prevents that:
#ifndef SINIDENT_H
#define SINIDENT_H*/
#ifdef __cplusplus
extern "C" {
#endif
/* function declarations */
void init_sinIDENT(void);
Netsnmp_Node_Handler handle_sinIDENT;
#ifdef __cplusplus
}
#endif
#endif /* SINIDENT_H */
And double checked the names:
# nm Ctest | grep sin
08049770 T* handle_sinIDENT*
080497c0 T* init_sinIDENT*
#
# nm CppTest |grep sin (showing mangled non-C-calling-convention)
08049b80 t _GLOBAL__I_init_sinIDENT
0804b080 r _ZZ13init_sinIDENTE5C.161
0804b060 r _ZZ13init_sinIDENTE8__func__
08049c60 T *handle_sinIDENT*
08049bb0 T *init_sinIDENT*
I have NO IDEA why the C++ version returns a failure. Please Help, I don't
want to be restricted to 20 year old C!
Thanks,
Ian
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