* ptrace-target.c (ptrace_exit_program): Cause main loop to exit.

	* ptrace-target.c (ptrace_exit_program): Cause main loop to exit.
	* server.c (sys/types.h, sys/stat.h, fcntl.h, string.h, unistd.h)
	(ctype.h, termios.h): Include.
	(close_device, tty_raw, invalid_speed, parse_speed): New functions.
	(speed_table): New static global.
	(usage): Update usage message.
	(main): Add support for connecting to serial devices.