Abort current process returning error code.
  Prints the message "Abnormal termination program", and immediately after aborts the process returning an error code (by default is 3). It does not flush any open stream and do not evaluate any atexit function.

Parameters.

(none)

Return Value.
  None.
  The calling process does not receives back control. abort returns the error code 3 to the parent process or the OS.

Portability.
  Defined in ANSI-C.

Example.

/* abort example */
#include <stdio.h>
#include <stdlib.h>

main()
{
  FILE * pFile;
  pFile= fopen ("myfile.txt","r");
  if (pFile == NULL) 
  {
    printf ("error opening file\n");
    abort();
  }

  /* normal file manipulation here */

  fclose (pFile);
  return 0;
}

See also.
  exit, atexit, signal