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FDETACH(P) FDETACH(P)
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 privi-
leges 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(). Subse-
quent 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 .
POSIX 2003 FDETACH(P)
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