cnet v2.0.5

simulation model

topology files
cmdline options
the API



cnet's layers and functions - the API

Descriptions of cnet's core functions are available from here. In each section functions are presented as ANSI-C prototypes, often with an example of their use.

Most library functions return the integer 0 on success and the integer -1 on failure. The most recent error status is reflected in the global variable cnet_errno. All values of cnet_errno will be instances of the enumerated type CnetError. Errors may be reported to stderr with cnet_perror() and their error message string accessed from cnet_errstr[(int)cnet_errno].


Function restrictions

Note that calls to the functions

    CNET_disable_application and
    CNET_set_handler(EV_APPLICATIONLAYER,...) and
are only valid if called from a node of node type NT_HOST. Function calls to either the Application or Physical Layers are invalid when cnet is not running (this can occur when the simulation is running under a windowing system, is paused, and a node's debug button is selected).

Calls to the functions

    CNET_set_promiscuous, and
cannot set the attributes of link 0, the LOOPBACK link, nor set a NIC address to either the zero address, 00:00:00:00:00:00, or the broadcast address, ff:ff:ff:ff:ff:ff.
cnet was written and is maintained by Chris McDonald (