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 abort()                 Abort Process and Return Error

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

 void       abort(void);

    abort() terminates a calling process, prints the message "Abnormal
    program termination" to 'stderr', exits with status code 3, and
    returns control to the parent without flushing stream buffers.

       Returns:     Exit status 3; does not return to the calling process

   -------------------------------- 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\n");
                    abort();
               }
           }