Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- detach a name from a STREAMS-based file descriptor (STREAMS
int fdetach(const char *path);
function shall detach a STREAMS-based file from the file to which
it was attached by a previous call to
argument points to the pathname of the attached STREAMS file. The
process shall have appropriate privileges or be the owner of the file.
A successful call to
shall cause all pathnames that named the attached STREAMS file to again
name the file to which the STREAMS file was attached. All subsequent
shall operate on the underlying file and not on the STREAMS file.
All open file descriptions established while the STREAMS file was
attached to the file referenced by
shall still refer to the STREAMS file after the
has taken effect.
If there are no open file descriptors or other references to the
STREAMS file, then a successful call to
shall be equivalent to performing the last
on the attached file.
Upon successful completion,
shall return 0; otherwise, it shall return -1 and set
to indicate the error.
function shall fail if:
Search permission is denied on a component of the path prefix.
argument names a file that is not currently attached.
A loop exists in symbolic links encountered during resolution of the
The length of a component of a pathname is longer than
A component of
does not name an existing file or
is an empty string.
A component of the path prefix names an existing file that is neither
a directory nor a symbolic link to a directory, or the
argument contains at least one non-<slash>
character and ends with one or more trailing
characters and the last pathname component names an existing file
that is neither a directory nor a symbolic link to a directory.
The effective user ID is not the owner of
and the process does not have appropriate privileges.
function may fail if:
symbolic links were encountered during resolution of the
The length of a pathname exceeds
or pathname resolution of a symbolic link produced an intermediate
result with a length that exceeds
The following sections are informative.
Detaching a File
The following example detaches the STREAMS-based file
from the file to which it was attached by a previous, successful call
Subsequent calls to open this file refer to the underlying file, not to
the STREAMS file.
char *pathname = "/tmp/named-STREAM";
ret = fdetach(pathname);
function may be removed in a future version.
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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