extern void pipe_spawn(char *buf, unsigned int len, Display *dpy, char *argv[]);
extern void spawn(Display *dpy, char *argv[]);
extern void swap(void **p1, void **p2);
extern void pipe_spawn(char *buf, unsigned int len, Display *dpy, char *argv[]);
extern void spawn(Display *dpy, char *argv[]);
extern void swap(void **p1, void **p2);