FDETACH(3)                 POSIX Programmer's Manual                FDETACH(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

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

SSYYNNOOPPSSIISS
       #include <stropts.h>

       int fdetach(const char *_p_a_t_h);

DDEESSCCRRIIPPTTIIOONN
       The _f_d_e_t_a_c_h() function shall detach a STREAMS-based file from the file
       to which it was attached by a previous call to _f_a_t_t_a_c_h().  The _p_a_t_h
       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 _f_d_e_t_a_c_h() 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 _p_a_t_h 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 _p_a_t_h shall still refer to the
       STREAMS file after the _f_d_e_t_a_c_h() has taken effect.

       If there are no open file descriptors or other references to the
       STREAMS file, then a successful call to _f_d_e_t_a_c_h() shall be equivalent
       to performing the last _c_l_o_s_e() on the attached file.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _f_d_e_t_a_c_h() shall return 0; otherwise, it
       shall return -1 and set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       The _f_d_e_t_a_c_h() function shall fail if:

       EEAACCCCEESS Search permission is denied on a component of the path prefix.

       EEIINNVVAALL The _p_a_t_h argument names a file that is not currently attached.

       EELLOOOOPP  A loop exists in symbolic links encountered during resolution of
              the _p_a_t_h argument.

       EENNAAMMEETTOOOOLLOONNGG
              The length of a component of a pathname is longer than
              {NAME_MAX}.

       EENNOOEENNTT A component of _p_a_t_h does not name an existing file or _p_a_t_h is an
              empty string.

       EENNOOTTDDIIRR
              A component of the path prefix names an existing file that is
              neither a directory nor a symbolic link to a directory, or the
              _p_a_t_h 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.

       EEPPEERRMM  The effective user ID is not the owner of _p_a_t_h and the process
              does not have appropriate privileges.

       The _f_d_e_t_a_c_h() function may fail if:

       EELLOOOOPP  More than {SYMLOOP_MAX} symbolic links were encountered during
              resolution of the _p_a_t_h argument.

       EENNAAMMEETTOOOOLLOONNGG
              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}.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
   DDeettaacchhiinngg aa FFiillee
       The following example detaches the STREAMS-based file //ttmmpp//nnaammeedd--SSTTRREEAAMM
       from the file to which it was attached by a previous, successful call
       to _f_a_t_t_a_c_h().  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);

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       The _f_d_e_t_a_c_h() function may be removed in a future version.

SSEEEE AALLSSOO
       _f_a_t_t_a_c_h()

       The Base Definitions volume of POSIX.1-2017, <<ssttrrooppttss..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                           FDETACH(3)
