On Wed, Feb 17, 2016 at 03:52:45PM +0800, 慕冬亮 wrote: > Hi everyone, > Unix systems support a large number of special characters that > receive special processing by the OS. One such character is the > “suspend” character (ctrl-Z by default), that causes a SIGTSTP signal > to be sent to the application process. The default action for the > signal is to suspend execution of the process. The system responds to > the suspend character (by sending the signal) as soon as possible > after it is typed in. In older Unix systems there was another special > character known as the “delayed suspend” character (ctrl-Y by default) > that had the same effect as the suspend character, except that the > signal is sent when the application process consumes the character, > rather than right away. (That this feature is no longer supported is > perhaps some indication of how useful it was ...) The suspend and the > delayed-suspend characters have the effect, when they are processed, > of deleting all characters currently waiting to be read by the user > application that arrived before them. Explain, how both special > characters are implemented? That sounds like a homework question, why exactly do you need/want to know this, and what have you done already to try to figure it out yourself? greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
