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  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, Standard for Information Technology  --  Portable  Operating  System
       Interface  (POSIX), The Open Group Base Specifications 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
       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 .