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 perror()                Print Error Message

 #include   <stdlib.h>                   Required for declarations only
 #include   <stdio.h>                    For ANSI compatibility

 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 producing an error
            a new-line character

    System error messages are accessed through an array of messages
    called 'sys_errlist' that are indexed by 'errno'.  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' thus 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:    No return value.

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


           int fhndl;

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