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   abort

   Usage
   #include <stdlib.h>
   void abort(void);

   Description
   The  abort function terminates the currently executing program. It  is
   the same as a function call to _exit with a non-zero status. abort can
   be  intercepted  using the signal SIGABRT (see the  function  signal).
   abort  does  not  flush  the  buffers nor  does  it  call  C++  static
   destructors.  It is preferable to use exit rather than abort  for  C++
   programs.

   Example
   #include <stdlib.h>
   #include <stdio.h>
   main()
   {
   FILE *fp;
        fp = fopen("file.dat","r");
        if(fp == NULL)
        {
             fprintf(stderr,"Could not open file.dat\n");
             abort();
        }
        printf("File opened\n");
   }