# fdetach

## PROLOG



           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.
    


## 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.
    


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