+extern Lisp_Object Qeuid, Qegid, Qcomm, Qstate, Qppid, Qpgrp, Qsess, Qttname;
+extern Lisp_Object Qminflt, Qmajflt, Qcminflt, Qcmajflt, Qutime, Qstime;
+extern Lisp_Object Qcutime, Qpri, Qnice, Qthcount, Qstart, Qvsize, Qrss, Qargs;
+extern Lisp_Object Quser, Qgroup, Qetime, Qpcpu, Qpmem, Qtpgid, Qcstime;
+extern Lisp_Object Qtime, Qctime;
+extern Lisp_Object QCport, QCspeed, QCprocess;
+extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
+extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;
+
+extern Lisp_Object list_system_processes (void);
+extern Lisp_Object system_process_attributes (Lisp_Object);
+
+extern void hold_keyboard_input (void);
+extern void unhold_keyboard_input (void);
+extern int kbd_on_hold_p (void);
+
+typedef void (*fd_callback)(int fd, void *data, int for_read);
+
+extern void add_read_fd (int fd, fd_callback func, void *data);
+extern void delete_read_fd (int fd);
+extern void add_write_fd (int fd, fd_callback func, void *data);
+extern void delete_write_fd (int fd);
+