f90_preconn_io: Automatic File Preconnection Module

Contents

Name

f90_preconn_io - Module controlling automatic file preconnection

Usage

USE F90_PRECONN_IO

Synopsis

Procedures
IOINIT.

Procedure Description

  SUBROUTINE IOINIT(BLANK,POSITION,PREFIX,VERBOSE)

  CHARACTER*(*),OPTIONAL,INTENT(IN) :: BLANK, POSITION, PREFIX
  LOGICAL,OPTIONAL,INTENT(IN) :: VERBOSE

This procedure controls automatic file preconnection. Files can be automatically preconnected when a logical unit is initially referenced without an OPEN statement; preconnection does not occur again after file CLOSE.

The name of the file to be preconnected is determined first by searching for an environment variable of the form FORT nn where nn is the two-digit logical unit number; e.g. FORT03. If this environment variable is found its value is used as the filename; otherwise the name "fort.n" is used; e.g. "fort.3". The file is opened either with FORM='FORMATTED' or FORM='UNFORMATTED' depending on whether the initial reference is with a formatted or unformatted i/o statement.

The BLANK and POSITION arguments control the BLANK= and POSITION= keywords in the implied OPEN statement when the file is preconnected; initially these are set to BLANK='NULL' and POSITION='REWIND'. Note that these have no meaning (and no effect) for unformatted files.

The PREFIX argument changes the prefix used to find the environment variable containing the preconnected file name. Initially this is "FORT". Only the first 30 characters of PREFIX are used.

The VERBOSE argument controls activity reporting; if it is .TRUE., subsequent preconnection activity will produce informative messages on the standard error unit.

Notes

The source code for this module may be found in the NAGWare library directory (usually /usr/local/NAGWare).

See Also

f95(1), nag_modules(3).

Bugs

Please report any bugs found to "support@nag.co.uk" or "infodesk@nag.com", along with any suggestions for improvements.