PROLOG

       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 .

IEEE/The Open Group                                   2017                                       FDETACH(3POSIX)