(libc.info.gz) Special Characters

 
 17.4.9 Special Characters
 -------------------------
 
 In canonical input, the terminal driver recognizes a number of special
 characters which perform various control functions.  These include the
 ERASE character (usually <DEL>) for editing input, and other editing
 characters.  The INTR character (normally `C-c') for sending a `SIGINT'
 signal, and other signal-raising characters, may be available in either
 canonical or noncanonical input mode.  All these characters are
 described in this section.
 
    The particular characters used are specified in the `c_cc' member of
 the `struct termios' structure.  This member is an array; each element
 specifies the character for a particular role.  Each element has a
 symbolic constant that stands for the index of that element--for
 example, `VINTR' is the index of the element that specifies the INTR
 character, so storing `'='' in `TERMIOS.c_cc[VINTR]' specifies `=' as
 the INTR character.
 
    On some systems, you can disable a particular special character
 function by specifying the value `_POSIX_VDISABLE' for that role.  This
 value is unequal to any possible character code.   Options for
 Files, for more information about how to tell whether the operating
 system you are using supports `_POSIX_VDISABLE'.

 
* Editing Characters          Special characters that terminate lines and
                                   delete text, and other editing functions.
* Signal Characters           Special characters that send or raise signals
                                   to or for certain classes of processes.
* Start/Stop Characters       Special characters that suspend or resume
                                   suspended output.
* Other Special               Other special characters for BSD systems:
 				  they can discard output, and print status.

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