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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.1‐2017, <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 .