Originální popis anglicky:
fdetach - detach a name from a STREAMS-based file descriptor (
STREAMS)
Návod, kniha: POSIX Programmer's Manual
#include <stropts.h>
int fdetach(const char *
path);
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.
Upon successful completion,
fdetach() shall return 0; otherwise, it shall
return -1 and set
errno to indicate the error.
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.
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);
None.
None.
None.
fattach() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<stropts.h>
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
.
