Interrupting makemap using control-C

So you're sitting there waiting for a long run of makemap to finish thinking "It's going to take ages! I asked for far more iterations than I need, but I can't restart it because it's taken so long to get to this point". As of git commit efde7077500 you can simply hit control-C and all will be well - makemap will continue running until the end of the next iteration. It will then create a map from the information it has, and terminate normally. Note, it needs to perform one more whole iteration before creating the map in order to get proper pixel values for the areas masked by ast.zeromask. One thing to beware of though - if the input data is split into more than one chunk, subsequent chunks that have not yet been started will not be included in the map.

If you want to abort NOW! without a map,  rather than waiting for the next iteration to complete, then press control-C a second time.

Note, if you are running makemap within a shell script, then the shell may handle the control-C signal itself, leading to some potentially odd behaviour. For instance,  the script may appear to terminate immediately, but in fact may leave the makemap process running in the background until the next iteration has completed. Most shells have ways of controlling what happens when an interrupt signal is detected. For instance, the (t)csh has the "onintr" command.