fdetach(3p) — Linux manual page


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

PROLOG         top

       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         top

       fdetach — detach a name from a STREAMS-based file descriptor

SYNOPSIS         top

       #include <stropts.h>

       int fdetach(const char *path);

DESCRIPTION         top

       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         top

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

ERRORS         top

       The fdetach() function shall fail if:

       EACCES Search permission is denied on a component of the path

       EINVAL The path argument names a file that is not currently

       ELOOP  A loop exists in symbolic links encountered during
              resolution of the path argument.

              The length of a component of a pathname is longer than

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

              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.

              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         top

   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);



RATIONALE         top



       The fdetach() function may be removed in a future version.

SEE ALSO         top


       The Base Definitions volume of POSIX.1‐2017, stropts.h(0p)

COPYRIGHT         top

       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(3P)

Pages that refer to this page: stropts.h(0p)close(3p)fattach(3p)