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 perror()                Print Error Message

 #include   <stdio.h>                    Required for declarations only

 void       perror(string);
 const char *string;                     User-supplied message

 int        errno;                       Error number
 int        sys_nerr;                    Number of system messages
 char       sys_errlist[sys_nerr];       Array of error messages

    perror() prints an error message to 'stderr'.  In order, perror()
    prints:

            the user-supplied 'string' argument,
            a colon,
            system error message for last library call that produced an
            error,
            a new-line character.

    System error messages are accessed through an array of messages,
    ordered by 'errno', called 'sys_errlist'.  The error number generated
    by the most recent system call is stored in the external variable
    'errno' (which should be declared at the external level).  'errno'
    reflects the most recent error generated by a system library call in
    the current program.  perror() uses 'errno' as an index to
    sys_errlist to print the appropriate error message.  'sys_nerr'
    contains the maximum number of elements in 'sys_errlist'.

    Returns:    Nothing

      Notes:    Call perror() immediately after the system call returns
                with an error. Otherwise, the error number in 'errno' may
                be overwritten by an error generated by a subsequent
                system call.

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

           #include <fcntl.h>                /* constants defined */
           #include <sys\stat.h>             /* constants defined */
           #include <io.h>                   /* for open */
           #include <stdio.h>


           int fhndl;

           main()
               {
               if ((fhndl = open("inp.dat",O_RDONLY)) == -1)
                   perror("unable to open file");
               }