FDETACH(3)                 POSIX Programmer's Manual                FDETACH(3)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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 aa 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.1-2017, <stropts.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  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.opengroup.org/unix/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                  2017                           FDETACH(3)
