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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.
NAME
fdetach — detach a name from a STREAMS-based file descriptor (STREAMS)
SYNOPSIS
#include <stropts.h>
int fdetach(const char *path);
DESCRIPTION
The fdetach() function shall detach a STREAMS-based file from the file to which it was attached by a
previous call to fattach(). The path 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 fdetach()
shall cause 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 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 path
shall still refer to the STREAMS file after the fdetach() has taken effect.
If there are no open file descriptors or other references to the STREAMS file, then a successful call to
fdetach() shall be equivalent to performing the last close() on the attached file.
RETURN VALUE
Upon successful completion, fdetach() shall return 0; otherwise, it shall return −1 and set errno to
indicate the error.
ERRORS
The fdetach() function shall fail if:
EACCES Search permission is denied on a component of the path prefix.
EINVAL The path argument names a file that is not currently attached.
ELOOP A loop exists in symbolic links encountered during resolution of the path argument.
ENAMETOOLONG
The length of a component of a pathname is longer than {NAME_MAX}.
ENOENT A component of path does not name an existing file or path is an empty string.
ENOTDIR
A component of the path prefix names an existing file that is neither a directory nor a symbolic
link to a directory, or the path argument contains at least one non-<slash> character and ends
with one or more trailing <slash> characters and the last pathname component names an existing
file that is neither a directory nor a symbolic link to a directory.
EPERM The effective user ID is not the owner of path and the process does not have appropriate
privileges.
The fdetach() function may fail if:
ELOOP More than {SYMLOOP_MAX} symbolic links were encountered during resolution of the path argument.
ENAMETOOLONG
The length of a pathname exceeds {PATH_MAX}, or pathname resolution of a symbolic link produced an
intermediate result with a length that exceeds {PATH_MAX}.
The following sections are informative.
EXAMPLES
Detaching a File
The following example detaches the STREAMS-based file /tmp/named-STREAM from the file to which it was
attached by a previous, successful call to fattach(). Subsequent calls to open this file refer to the
underlying file, not to the STREAMS file.
#include <stropts.h>
...
char *pathname = "/tmp/named-STREAM";
int ret;
ret = fdetach(pathname);
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
The fdetach() function may be removed in a future version.
SEE ALSO
fattach()
The Base Definitions volume of POSIX.1‐2008, <stropts.h>
COPYRIGHT
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
http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are most likely to have been introduced
during the conversion of the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .