cli: Disable XON/XOFF in the tty
CLI history forward-search is bound to ^S which is common, but
that is also the tty's default control byte to pause output.
So we disable XON/XOFF in the tty so that we can use ^S.
@@ -2927,8 +2927,12 @@ unix_cli_config (vlib_main_t * vm, unformat_input_t * input)
tio = um->tio_stdin;
/* echo off, canonical mode off, ext'd input processing off */
tio.c_lflag &= ~(ECHO | ICANON | IEXTEN);
+ /* disable XON/XOFF, so ^S invokes the history search */
+ tio.c_iflag &= ~(IXON | IXOFF);
tio.c_cc[VMIN] = 1; /* 1 byte at a time */
tio.c_cc[VTIME] = 0; /* no timer */
+ tio.c_cc[VSTOP] = _POSIX_VDISABLE; /* not ^S */
+ tio.c_cc[VSTART] = _POSIX_VDISABLE; /* not ^Q */
tcsetattr (STDIN_FILENO, TCSAFLUSH, &tio);
/* See if we can do ANSI/VT100 output */
