Intel® Fortran Compiler 18.0 Developer Guide and Reference
POSIX Subroutine: Returns the file descriptor associated with a specified unit.
USE IFPOSIX
CALL PXFFILENO (lunit,fd,ierror)
lunit |
(Input) INTEGER(4). A Fortran logical unit. |
fd |
(Output) INTEGER(4). The returned file descriptor. |
ierror |
(Output) INTEGER(4). The error status. |
If successful, ierror is set to zero; otherwise, an error code. Possible error codes are:
EINVAL: lunit is not an open unit.
EBADF: lunit is not connected with a file descriptor.
The PXFFILENO subroutine returns in fd the file descriptor associated with lunit.
On Windows* systems, the default value of the POSIX/IO flag is 0, which prevents OPEN from connecting a unit to a file descriptor and causes PXFFILENO to return an error.
To prevent this, call subroutine PXFPOSIXIO and set the value of the POSIX/IO flag to 1. This setting allows a connection to a file descriptor.
The file-descriptor used by POSIX is not the same as the corresponding file handle used by Windows, so it does not have the same value.