Technical Reference: Base Operating System and Extensions, Volume 1

fdetach Subroutine

Purpose

Detaches STREAMS-based file from the file to which it was attached.

Syntax

#include <stropts.h>
int fdetach(const char *path);

Parameters

path

Pathname of a file previous associated with a STREAMS-based object using the fattach subroutine.

The fdetach subroutine detaches a STREAMS-based file from the file to which it was attached by a previous call to fattach subroutine. The path argument points to the pathname of the attached STREAMS file. The process must have appropriate privileges or be the owner of the file. A successful call to fdetach subroutine causes all pathnames that named the attached STREAMS file to again name the file to which the STREAMS file was attached. All subsequent operations on path will operate on the underlying file and not on the STREAMS file.

All open file descriptors established while the STREAMS file was attached to the file referenced by path will still refer to the STREAMS file after the fdetach subroutine has taken effect.

If there are no open file descriptors or other references to the STREAMS file, then a successful call to fdetach subroutine has the same effect as performing the last close subroutine on the attached file.

The umount command may be used to detach a file name if an | application exits before performing fdetach subroutine.

Return Value

0	Successful completion.
-1	Not successful and errno set to one of the following.

Errno Value

EACCES	Search permission is denied on a component of the path prefix.
EPERM	The effective user ID is not the owner of path and the process does not have appropriate privileges.
ENOTDIR	A component of the path prefix is not a directory.
ENOENT	A component of path parameter does not name an existing file or path is an empty string.
EINVAL	The path parameter names a file that is not currently attached.
ENAMETOOLONG	The size of path parameter exceeds {PATH_MAX}, or a component of path is longer than {NAME_MAX}.
ELOOP	Too many symbolic links were encountered in resolving the path parameter.
ENOMEM	Insufficient storage space is available.

Implementation Specifics

These subroutines are part of Base Operating System (BOS) Runtime.

Related Information

The fattach (fattach Subroutine) subroutine, isastream subroutine.