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

       fdetach - detach a name from a STREAMS-based file descriptor (STREAMS)

       #include <stropts.h>

       int fdetach(const char *path);

       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 pro-
       cess 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.

       Upon successful completion, fdetach() shall  return  0;  otherwise,  it
       shall return -1 and set errno to indicate the error.

       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.

              The size of a pathname exceeds {PATH_MAX} or a  pathname  compo-
              nent is longer than {NAME_MAX}.

       ENOENT A component of path does not name an existing file or path is an
              empty string.

              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.

              Pathname resolution of a symbolic link produced an  intermediate
              result whose length exceeds {PATH_MAX}.

       The following sections are informative.

   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 underly-
       ing file, not to the STREAMS file.

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

                  ret = fdetach(filename);




       fattach()  ,  the  Base  Definitions  volume  of  IEEE Std 1003.1-2001,

       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 .

IEEE/The Open Group                  2003                           FDETACH(P)

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