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 abort()                 Abort Process and Return Error

 #include   <process.h>                  Required for declarations only
 #include   <stdlib.h>                   Use either <process.h> or <stdlib.h>

 void       abort(void);

    abort() terminates the process that calls it and prints the message
    "Abnormal program termination" to 'stderr'.  raise(SIGABRT) is called
    which terminates the calling process with exit code 3 (abnormal
    termination) and returns control to the parent process.  abort() does
    not flush stream buffers, or do atexit() or onexit() processing.

    Returns:    abort() does not return to the calling process.  It
                returns an exit status of 3 to the parent process.

 Compatibility: The Microsoft C Version 4.0 runtime library did not call
                raise(SIGABRT).

   -------------------------------- Example ---------------------------------

    The following statements terminate the program if the file
    "testfile.dat" cannot be opened:

           #include <process.h>    /* for 'abort' (also in <stdlib.h>) */
           #include <stdio.h>      /* for 'fprintf' */

           main()
           {
               FILE *f;

               if ((f = fopen("testfile.dat", "r")) == NULL) {
                    fprintf(stderr, "can't open testfile.dat");
                    abort();
               }
           }