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FATTACH(P) FATTACH(P)
NAME
fattach - attach a STREAMS-based file descriptor to a file in the file system name
space (STREAMS)
SYNOPSIS
#include <stropts.h>
int fattach(int fildes, const char *path);
DESCRIPTION
The fattach() function shall attach a STREAMS-based file descriptor to a file,
effectively associating a pathname with fildes. The application shall ensure that
the fildes argument is a valid open file descriptor associated with a STREAMS file.
The path argument points to a pathname of an existing file. The application shall
have the appropriate privileges or be the owner of the file named by path and have
write permission. A successful call to fattach() shall cause all pathnames that
name the file named by path to name the STREAMS file associated with fildes, until
the STREAMS file is detached from the file. A STREAMS file can be attached to more
than one file and can have several pathnames associated with it.
The attributes of the named STREAMS file shall be initialized as follows: the per-
missions, user ID, group ID, and times are set to those of the file named by path,
the number of links is set to 1, and the size and device identifier are set to
those of the STREAMS file associated with fildes. If any attributes of the named
STREAMS file are subsequently changed (for example, by chmod()), neither the
attributes of the underlying file nor the attributes of the STREAMS file to which
fildes refers shall be affected.
File descriptors referring to the underlying file, opened prior to an fattach()
call, shall continue to refer to the underlying file.
RETURN VALUE
Upon successful completion, fattach() shall return 0. Otherwise, -1 shall be
returned and errno set to indicate the error.
ERRORS
The fattach() function shall fail if:
EACCES Search permission is denied for a component of the path prefix, or the pro-
cess is the owner of path but does not have write permissions on the file
named by path.
EBADF The fildes argument is not a valid open file descriptor.
EBUSY The file named by path is currently a mount point or has a STREAMS file
attached to it.
ELOOP A loop exists in symbolic links encountered during resolution of the path
argument.
ENAMETOOLONG
The size of path exceeds {PATH_MAX} or a component of path 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 of the process is not the owner of the file named by
path and the process does not have appropriate privilege.
The fattach() function may fail if:
EINVAL The fildes argument does not refer to a STREAMS file.
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}.
EXDEV A link to a file on another file system was attempted.
The following sections are informative.
EXAMPLES
Attaching a File Descriptor to a File
In the following example, fd refers to an open STREAMS file. The call to fattach()
associates this STREAM with the file /tmp/named-STREAM, such that any future calls
to open /tmp/named-STREAM, prior to breaking the attachment via a call to fde-
tach(), will instead create a new file handle referring to the STREAMS file associ-
ated with fd.
#include <stropts.h>
...
int fd;
char *filename = "/tmp/named-STREAM";
int ret;
ret = fattach(fd, filename);
APPLICATION USAGE
The fattach() function behaves similarly to the traditional mount() function in the
way a file is temporarily replaced by the root directory of the mounted file sys-
tem. In the case of fattach(), the replaced file need not be a directory and the
replacing file is a STREAMS file.
RATIONALE
The file attributes of a file which has been the subject of an fattach() call are
specifically set because of an artefact of the original implementation. The inter-
nal mechanism was the same as for the mount() function. Since mount() is typically
only applied to directories, the effects when applied to a regular file are a lit-
tle surprising, especially as regards the link count which rigidly remains one,
even if there were several links originally and despite the fact that all original
links refer to the STREAM as long as the fattach() remains in effect.
FUTURE DIRECTIONS
None.
SEE ALSO
fdetach() , isastream() , 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 FATTACH(P)
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