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Developing SMUX peers for SNMP agents

Error recovery

All of the SMUX routines return NOTOK on failure. The function

char * smux_error(smux_errno)
extern int  smux_errno;
returns an appropriate string based on the error number passed to it. The parameter value is set by functions in the SMUX/SNMP library and the value could be any of: parameterMissing, invalidOperation, inProgress, systemError, congestion, or youLoseBig. The variable
extern char smux_info[BUFSIZ];
contains a printable explanation of what caused the failure. All errors are FATAL except inProgress; if the error code is inProgress, the peer program continues retrying the file descriptor for writability, and then calls smux_simple_open again. Otherwise, the program takes the appropriate action based on the error code returned.
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