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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 dif-
       fer (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 path-
       names 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  fde-
       tach() 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 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 *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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (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 Stan-
       dard,  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 .



IEEE/The Open Group                  2003                          FDETACH(3P)