block_tty_out_signal  967 src/sysdep.c     block_tty_out_signal (&oldset);
block_tty_out_signal   32 src/syssignal.h extern void block_tty_out_signal (sigset_t *);
block_tty_out_signal 4023 src/term.c           block_tty_out_signal (&oldset);
block_tty_out_signal 4157 src/term.c       block_tty_out_signal (&oldset);