.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
.TH "FDETACH" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\" fdetach 
.SH PROLOG
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.
.SH NAME
fdetach \- detach a name from a STREAMS-based file descriptor (\fBSTREAMS\fP)
.SH SYNOPSIS
.LP
\fB#include <stropts.h>
.br
.sp
int fdetach(const char *\fP\fIpath\fP\fB); \fP
\fB
.br
\fP
.SH DESCRIPTION
.LP
The \fIfdetach\fP() function shall detach a STREAMS-based file from
the file to which it was attached by a previous call to \fIfattach\fP().
The \fIpath\fP 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 \fIfdetach\fP() 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 \fIpath\fP shall operate on the underlying file and
not on the STREAMS file.
.LP
All open file descriptions established while the STREAMS file was
attached to the file referenced by \fIpath\fP shall still
refer to the STREAMS file after the \fIfdetach\fP() has taken effect.
.LP
If there are no open file descriptors or other references to the STREAMS
file, then a successful call to \fIfdetach\fP() shall
be equivalent to performing the last \fIclose\fP() on the attached
file.
.SH RETURN VALUE
.LP
Upon successful completion, \fIfdetach\fP() shall return 0; otherwise,
it shall return -1 and set \fIerrno\fP to indicate the
error.
.SH ERRORS
.LP
The \fIfdetach\fP() function shall fail if:
.TP 7
.B EACCES
Search permission is denied on a component of the path prefix.
.TP 7
.B EINVAL
The \fIpath\fP argument names a file that is not currently attached.
.TP 7
.B ELOOP
A loop exists in symbolic links encountered during resolution of the
\fIpath\fP argument.
.TP 7
.B ENAMETOOLONG
The size of a pathname exceeds {PATH_MAX} or a pathname component
is longer than {NAME_MAX}.
.TP 7
.B ENOENT
A component of \fIpath\fP does not name an existing file or \fIpath\fP
is an empty string.
.TP 7
.B ENOTDIR
A component of the path prefix is not a directory.
.TP 7
.B EPERM
The effective user ID is not the owner of \fIpath\fP and the process
does not have appropriate privileges.
.sp
.LP
The \fIfdetach\fP() function may fail if:
.TP 7
.B ELOOP
More than {SYMLOOP_MAX} symbolic links were encountered during resolution
of the \fIpath\fP argument.
.TP 7
.B ENAMETOOLONG
Pathname resolution of a symbolic link produced an intermediate result
whose length exceeds {PATH_MAX}.
.sp
.LP
\fIThe following sections are informative.\fP
.SH EXAMPLES
.SS Detaching a File
.LP
The following example detaches the STREAMS-based file \fB/tmp/named-STREAM\fP
from the file to which it was attached by a
previous, successful call to \fIfattach\fP(). Subsequent calls to
open this file refer to
the underlying file, not to the STREAMS file.
.sp
.RS
.nf

\fB#include <stropts.h>
\&...
    char *filename = "/tmp/named-STREAM";
    int ret;
.sp

    ret = fdetach(filename);
\fP
.fi
.RE
.SH APPLICATION USAGE
.LP
None.
.SH RATIONALE
.LP
None.
.SH FUTURE DIRECTIONS
.LP
None.
.SH SEE ALSO
.LP
\fIfattach\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
\fI<stropts.h>\fP
.SH 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 .