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

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing 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.1-2008, <stropts.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- 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 Stan-
       dard 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)