trusty (3) fdetach.3posix.gz

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 .