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 (con-
       sult 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 oper-
       ate 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 size of a pathname exceeds {PATH_MAX} or a pathname component 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 is not 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
              Pathname resolution of a symbolic link produced an intermediate result whose length 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 pre-
       vious, successful call to fattach(). Subsequent calls to open this file refer to the underlying file, not to the  STREAMS
       file.


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


                  ret = fdetach(filename);

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       fattach(), the Base Definitions volume of IEEE Std 1003.1-2001, <stropts.h>

COPYRIGHT
       Portions  of  this  text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for
       Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6,  Copy-
       right (C) 2001-2003 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.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                                   FDETACH(3P)