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NAME
     perror, gerror, ierrno - get system error messages

DESCRIPTION
     perror - write a message to FORTRAN logical unit 0
          The message is for the last detected system error.
          string is a character input argument.
          It is written preceding the standard error message.

        Example 1: perror:
               ...
          CALL perror ( "file is for formated I/O" )
               ...

     gerror - return system error message
          string is a character output argument.

        Example 2: gerror, used as a subroutine:
          CHARACTER string*30
               ...
          CALL gerror ( string )
          WRITE(*,*)  string
          END

        Example 3: gerror, used as  a  function;  in  this  case,
        string is not used:
          CHARACTER gerror*30, z*30
               ...
          z = gerror( )
          WRITE(*,*)  z
          END

     ierrno - return the error number of the last detected system
     error

          This number is updated  only  when  an  error  actually
          occurs.   Most  routines  and I/O statements that might
          generate such errors return an  error  code  after  the
          call;  that  value is a more reliable indicator of what
          caused the error condition.

        Example 4: ierrno:
          INTEGER  ierrno, n
               ...
          n = ierrno ( )
          WRITE(*,*)  n
          END

FILES
     libF77.a


SEE ALSO
     intro(2), perror(3)

RESTRICTIONS
     string in the call to perror cannot be longer than 127 char-
     acters.

     The length of the string returned by gerror is determined by
     the calling program.

NOTES
     If the error code is greater than or equal to 1000, it is  a
     f77 I/O error.

     If the error code is less than 1000, it is a  system  error.
     See intro(2).

     The f77 I/O error codes and their meanings are:

          1000 error in format
          1001 illegal unit number
          1002 formatted io not allowed
          1003 unformatted io not allowed
          1004 direct io not allowed
          1005 sequential io not allowed
          1006 can't backspace file
          1007 off beginning of record
          1008 can't stat file
          1009 no * after repeat count
          1010 off end of record
          1011 <not used>
          1012 incomprehensible list input
          1013 out of free space
          1014 unit not connected
          1015 read unexpected character
          1016 illegal logical input field
          1017 'new' file exists
          1018 can't find 'old' file
          1019 unknown system error
          1020 requires seek ability
          1021 illegal argument
          1022 negative repeat count
          1023 illegal operation for unit
          1024 <not used>
          1025 incompatible specifiers in open
          1026 illegal input for namelist
          1027 error in FILEOPT parameter

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