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 (including the GNU system).
