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FATTACH(3P)		   POSIX Programmer's Manual		   FATTACH(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.

       fattach — attach a STREAMS-based file descriptor to a file in the  file
       system name space (STREAMS)

       #include <stropts.h>

       int fattach(int fildes, const char *path);

       The  fattach() function shall attach a STREAMS-based file descriptor to
       a file, effectively associating a pathname with fildes.	 The  applica‐
       tion  shall  ensure  that  the  fildes  argument	 is  a valid open file
       descriptor associated with a STREAMS file. The path argument points  to
       a  pathname of an existing file. The application shall have appropriate
       privileges or be the owner of the file named by	path  and  have	 write
       permission.  A  successful  call to fattach() shall cause all pathnames
       that name the file named by path to name the  STREAMS  file  associated
       with  fildes,  until  the  STREAMS  file	 is  detached from the file. A
       STREAMS file can be attached to more than one file and can have several
       pathnames associated with it.

       The  attributes	of the named STREAMS file shall be initialized as fol‐
       lows: the permissions, user ID, group ID, and times are set to those of
       the  file  named by path, the number of links is set to 1, and the size
       and device identifier are set to those of the STREAMS  file  associated
       with  fildes.   If  any attributes of the named STREAMS file are subse‐
       quently changed (for example, by chmod()), neither  the	attributes  of
       the  underlying	file  nor  the attributes of the STREAMS file to which
       fildes refers shall be affected.

       File descriptors referring to the underlying file, opened prior	to  an
       fattach() call, shall continue to refer to the underlying file.

       Upon  successful	 completion,  fattach()	 shall return 0. Otherwise, −1
       shall be returned and errno set to indicate the error.

       The fattach() function shall fail if:

       EACCES Search permission is denied for a component of the path  prefix,
	      or the process is the owner of path but does not have write per‐
	      missions on the file named by path.

       EBADF  The fildes argument is not a valid open file descriptor.

       EBUSY  The file named by path is currently  a  mount  point  or	has  a
	      STREAMS file attached to it.

       ELOOP  A loop exists in symbolic links encountered during resolution of
	      the path argument.

	      The  length  of  a  component  of	 a  pathname  is  longer  than

       ENOENT A component of path does not name an existing file or path is an
	      empty string.

	      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.

       EPERM  The  effective  user  ID	of the process is not the owner of the
	      file named by path and the process  does	not  have  appropriate

       The fattach() function may fail if:

       EINVAL The fildes argument does not refer to a STREAMS file.

       ELOOP  More  than  {SYMLOOP_MAX} symbolic links were encountered during
	      resolution of the path argument.

	      The length of a pathname exceeds {PATH_MAX}, or pathname resolu‐
	      tion  of	a symbolic link produced an intermediate result with a
	      length that exceeds {PATH_MAX}.

       EXDEV  A link to a file on another file system was attempted.

       The following sections are informative.

   Attaching a File Descriptor to a File
       In the following example, fd refers to an open STREAMS file.  The  call
       to  fattach()  associates  this STREAM with the file /tmp/named-STREAM,
       such that any future calls to open /tmp/named-STREAM, prior to breaking
       the  attachment via a call to fdetach(), will instead create a new file
       handle referring to the STREAMS file associated with fd.

	   #include <stropts.h>
	       int fd;
	       char *pathname = "/tmp/named-STREAM";
	       int ret;

	       ret = fattach(fd, pathname);

       The fattach() function behaves similarly	 to  the  traditional  mount()
       function	 in  the way a file is temporarily replaced by the root direc‐
       tory of the mounted file system. In the case of fattach(), the replaced
       file need not be a directory and the replacing file is a STREAMS file.

       The  file  attributes  of  a file which has been the subject of an fat‐
       tach() call are specifically set because of an artifact of the original
       implementation.	The internal mechanism was the same as for the mount()
       function. Since mount() is typically only applied to  directories,  the
       effects	when  applied to a regular file are a little surprising, espe‐
       cially as regards the link count which rigidly  remains	one,  even  if
       there were several links originally and despite the fact that all orig‐
       inal links refer to the STREAM as long  as  the	fattach()  remains  in

       The fattach() function may be removed in a future version.

       fdetach(), isastream()

       The Base Definitions volume of POSIX.1‐2008, <stropts.h>

       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 Electri‐
       cal  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.ker‐
       nel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2013			   FATTACH(3P)

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