libc.info: abort

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`abort'--abnormal termination of a program

   *Synopsis*
     #include <stdlib.h>
     void abort(void);
   *Description*
Use `abort' to signal that your program has detected a condition it
cannot deal with.  Normally, `abort' ends your program's execution.
   Before terminating your program, `abort' raises the exception
`SIGABRT' (using ``raise(SIGABRT)'').  If you have used `signal' to
register an exception handler for this condition, that handler has the
opportunity to retain control, thereby avoiding program termination.
   In this implementation, `abort' does not perform any stream- or
file-related cleanup (the host environment may do so; if not, you can
arrange for your program to do its own cleanup with a `SIGABRT'
exception handler).
*Returns*
`abort' does not return to its caller.
*Portability*
ANSI C requires `abort'.
   Supporting OS subroutines required: `_exit' and optionally, `write'.