taglinefilesource code
VSUSP345drivers/char/tty_ioctl.ctmp.t_suspc = tty->termios->c_cc[VSUSP];
VSUSP346drivers/char/tty_ioctl.ctmp.t_dsuspc = tty->termios->c_cc[VSUSP];  /* what is dsuspc anyway? */
VSUSP364drivers/char/tty_ioctl.ctty->termios->c_cc[VSUSP] = tmp.t_suspc;
VSUSP115include/linux/tty.h#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])