на основе файлового дескриптора (ПОТОКИ) (based file descriptor (STREAMS))
Пролог (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.
Имя (Name)
fdetach — detach a name from a STREAMS-based file descriptor
(STREAMS)
Синопсис (Synopsis)
#include <stropts.h>
int fdetach(const char *path);
Описание (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.
Возвращаемое значение (Return value)
Upon successful completion, fdetach() shall return 0; otherwise,
it shall return -1 and set errno to indicate the error.
Ошибки (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 length of a component of a pathname 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 names an existing file that
is neither a directory nor a symbolic link to a directory,
or the path argument contains at least one non-<slash>
character and ends with one or more trailing <slash>
characters and the last pathname component names an
existing file that is neither a directory nor a symbolic
link to 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
The length of a pathname exceeds {PATH_MAX}, or pathname
resolution of a symbolic link produced an intermediate
result with a length that exceeds {PATH_MAX}.
The following sections are informative.
Примеры (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 *pathname = "/tmp/named-STREAM";
int ret;
ret = fdetach(pathname);
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
The fdetach() function may be removed in a future version.
Смотри также (See also)
fattach(3p)
The Base Definitions volume of POSIX.1‐2017, stropts.h(0p)
