fdetach - Detach a STREAMS-based file descriptor from a
file in the file system name space
const char *path );
Standard C Library (libc.so, libc.a)
Interfaces documented on this reference page conform to
industry standards as follows:
fdetach(): XSH4.0, XSH4.2, XSH5.0
Refer to standards(5) for more information about industry
standards and associated tags.
Specifies the pathname of an existing regular file or
The fdetach() function disassociates a STREAMS-based file
descriptor from the file pointed to by the path parameter.
The STREAMS-based file descriptor was associated with the
file by a prior fattach() function.
A successful call to the fdetach() function causes all
path names that named the attached STREAMS file to again
name the file to which the STREAMS file was attached. All
subsequent operations on the file pointed to by the path
parameter are performed on the underlying file and not on
the STREAMS file.
All open file descriptors established while the STREAMS
file was attached to the file referenced by the path
parameter still refer to the STREAMS file after the fdetach()
function takes effect.
If there are no open file descriptors or other references
to the STREAMS file when a fdetach() function is called, a
successful call has the same effect as performing the last
close call on the attached file.
The detach() function uses the File-on-File Mounting (FFM)
file system. Instead of unmounting a file system on a
mount point, the detach() function FFM unmounts a file
descriptor from a mount point, which can be either a
directory or a regular file. See ffm(4).
[Tru64 UNIX] The fdetach() function requires that the
FFM_FS kernel option be configured. See System Administration
for information on configuring kernel options.
Upon successful completion, the fdetach() function returns
a value of 0 (zero). Otherwise, it returns a value of -1
is returned, and errno is set to indicate the error.
If any of the following conditions occurs, the fdetach()
function sets errno to the value that corresponds to the
condition. The user is not the owner of the file or does
not have the correct permissions to access the file.
[Tru64 UNIX] There is an active reference to a file
located on the file system. [Tru64 UNIX] The path parameter
points outside the process's allocated address space.
The path parameter names a file that is not currently
attached. Too many symbolic links were found when path
was resolved. An element of the path parameter does not
name an existing file or path is an empty string. An element
of the directory portion of the path parameter is not
a directory. [Tru64 UNIX] The size of a pathname component
is longer than NAME_MAX when _POSIX_NO_TRUNC is in
The pathname length is longer than [PATH_MAX], or
the length of the intermediate result of a pathname
resolution of a symbolic link is longer than
PATH_MAX. The effective user ID is not the owner
of the file pointed to by the path parameter or
does not specify a user with the correct privileges.
Functions: fattach(3), isastream(3), umount(3)
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