Implement WIFEXITED & all other macros for disecting a process's output status
Implement WIFEXITED & all other macros for disecting a process's output status

lispnik/iolib,sionescu/iolib,attila-lendvai/iolib,lispnik/iolib,dkochmanski/iolib,deadtrickster/iolib,attila-lendvai/iolib,attila-lendvai/iolib,shamazmazum/iolib,shamazmazum/iolib,deadtrickster/iolib,dkochmanski/iolib,tiago4orion/iolib,shamazmazum/iolib,tiago4orion/iolib,sionescu/iolib,sionescu/iolib,tiago4orion/iolib,lispnik/iolib,deadtrickster/iolib,dkochmanski/iolib