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1 extern int getpts(int[], char*);2 extern int childpty(int[], char*);3 extern void updatewinsize(int, int, int, int);4 extern int rcfd;5 extern int rcstart(int, char*[], int*, int*);6 extern int isecho(int);7 extern int setecho(int, int);8 extern int noecho;9 extern int getintr(int);10 extern int loginshell;