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 .