#### 17.5.9.2 Characters that Cause Signals ¶

These special characters may be active in either canonical or noncanonical input mode, but only when the `ISIG` flag is set (see Local Modes).

Macro: `int` VINTR ¶

  This is the subscript for the INTR character in the special control character array. `termios.c_cc[VINTR]` holds the character itself.

  The INTR (interrupt) character raises a `SIGINT` signal for all processes in the foreground job associated with the terminal. The INTR character itself is then discarded. See Signal Handling, for more information about signals.

  Typically, the INTR character is `C-c`.

Macro: `int` VQUIT ¶

  This is the subscript for the QUIT character in the special control character array. `termios.c_cc[VQUIT]` holds the character itself.

  The QUIT character raises a `SIGQUIT` signal for all processes in the foreground job associated with the terminal. The QUIT character itself is then discarded. See Signal Handling, for more information about signals.

  Typically, the QUIT character is `C-\`.

Macro: `int` VSUSP ¶

  This is the subscript for the SUSP character in the special control character array. `termios.c_cc[VSUSP]` holds the character itself.

  The SUSP (suspend) character is recognized only if the implementation supports job control (see Job Control). It causes a `SIGTSTP` signal to be sent to all processes in the foreground job associated with the terminal. The SUSP character itself is then discarded. See Signal Handling, for more information about signals.

  Typically, the SUSP character is `C-z`.

Few applications disable the normal interpretation of the SUSP character. If your program does this, it should provide some other mechanism for the user to stop the job. When the user invokes this mechanism, the program should send a `SIGTSTP` signal to the process group of the process, not just to the process itself. See Signaling Another Process.

Macro: `int` VDSUSP ¶

  This is the subscript for the DSUSP character in the special control character array. `termios.c_cc[VDSUSP]` holds the character itself.

  The DSUSP (suspend) character is recognized only if the implementation supports job control (see Job Control). It sends a `SIGTSTP` signal, like the SUSP character, but not right away—only when the program tries to read it as input. Not all systems with job control support DSUSP; only BSD-compatible systems do (including GNU/Hurd systems).

  See Signal Handling, for more information about signals.

  Typically, the DSUSP character is `C-y`.