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FDETACH(3P) POSIX Programmer's Manual FDETACH(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.
fdetach — detach a name from a STREAMS-based file descriptor
(STREAMS)
#include <stropts.h>
int fdetach(const char *path);
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.
Upon successful completion, fdetach() shall return 0; otherwise, it
shall return −1 and set errno to indicate the error.
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.
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);
None.
None.
The fdetach() function may be removed in a future version.
fattach(3p)
The Base Definitions volume of POSIX.1‐2008, stropts.h(0p)
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 .
IEEE/The Open Group 2013 FDETACH(3P)
Pages that refer to this page: stropts.h(0p), close(3p), fattach(3p)