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CLASS="CHAPTER"
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CLASS="CHAPTER"
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><H1
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><H1
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><A
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><A
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NAME="FILEIO-FILE-TABLE">Chapter 22. File Table</H1
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NAME="FILEIO-FILE-TABLE">Chapter 22. File Table</H1
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><P
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><P
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>Once a file has been opened it is represented by an open file
|
>Once a file has been opened it is represented by an open file
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object. These are allocated from an array of available file
|
object. These are allocated from an array of available file
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objects. User code accesses these open file objects via a second array
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objects. User code accesses these open file objects via a second array
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of pointers which is indexed by small integer offsets. This gives the
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of pointers which is indexed by small integer offsets. This gives the
|
usual Unix file descriptor functionality, complete with the various
|
usual Unix file descriptor functionality, complete with the various
|
duplication mechanisms.</P
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duplication mechanisms.</P
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><P
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><P
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>A file table entry has the following structure:</P
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>A file table entry has the following structure:</P
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><TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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WIDTH="70%"
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><TR
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><TR
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><TD
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
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>struct CYG_FILE_TAG
|
>struct CYG_FILE_TAG
|
{
|
{
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cyg_uint32 f_flag; /* file state */
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cyg_uint32 f_flag; /* file state */
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cyg_uint16 f_ucount; /* use count */
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cyg_uint16 f_ucount; /* use count */
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cyg_uint16 f_type; /* descriptor type */
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cyg_uint16 f_type; /* descriptor type */
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cyg_uint32 f_syncmode; /* synchronization protocol */
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cyg_uint32 f_syncmode; /* synchronization protocol */
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struct CYG_FILEOPS_TAG *f_ops; /* file operations */
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struct CYG_FILEOPS_TAG *f_ops; /* file operations */
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off_t f_offset; /* current offset */
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off_t f_offset; /* current offset */
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CYG_ADDRWORD f_data; /* file or socket */
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CYG_ADDRWORD f_data; /* file or socket */
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CYG_ADDRWORD f_xops; /* extra type specific ops */
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CYG_ADDRWORD f_xops; /* extra type specific ops */
|
cyg_mtab_entry *f_mte; /* mount table entry */
|
cyg_mtab_entry *f_mte; /* mount table entry */
|
};</PRE
|
};</PRE
|
></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
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><I
|
>f_flag</I
|
>f_flag</I
|
></TT
|
></TT
|
> field contains some FILEIO
|
> field contains some FILEIO
|
control bits and some bits propagated from the
|
control bits and some bits propagated from the
|
<TT
|
<TT
|
CLASS="PARAMETER"
|
CLASS="PARAMETER"
|
><I
|
><I
|
>flags</I
|
>flags</I
|
></TT
|
></TT
|
> argument of the
|
> argument of the
|
<TT
|
<TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>open()</TT
|
>open()</TT
|
> call (defined by
|
> call (defined by
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYG_FILE_MODE_MASK</TT
|
>CYG_FILE_MODE_MASK</TT
|
>).</P
|
>).</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_ucount</I
|
>f_ucount</I
|
></TT
|
></TT
|
> field contains a use count that
|
> field contains a use count that
|
controls when a file will be closed. Each duplicate in the file
|
controls when a file will be closed. Each duplicate in the file
|
descriptor array counts for one reference here. It is also
|
descriptor array counts for one reference here. It is also
|
incremented around each I/O operation to ensure that the file cannot
|
incremented around each I/O operation to ensure that the file cannot
|
be closed while it has current I/O operations.</P
|
be closed while it has current I/O operations.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_type</I
|
>f_type</I
|
></TT
|
></TT
|
> field indicates the type of the
|
> field indicates the type of the
|
underlying file object. Some of the possible values here are
|
underlying file object. Some of the possible values here are
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYG_FILE_TYPE_FILE</TT
|
>CYG_FILE_TYPE_FILE</TT
|
>,
|
>,
|
<TT
|
<TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYG_FILE_TYPE_SOCKET</TT
|
>CYG_FILE_TYPE_SOCKET</TT
|
> or <TT
|
> or <TT
|
CLASS="LITERAL"
|
CLASS="LITERAL"
|
>CYG_FILE_TYPE_DEVICE</TT
|
>CYG_FILE_TYPE_DEVICE</TT
|
>.</P
|
>.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_syncmode</I
|
>f_syncmode</I
|
></TT
|
></TT
|
> field is copied from the
|
> field is copied from the
|
<TT
|
<TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>syncmode</I
|
>syncmode</I
|
></TT
|
></TT
|
> field of the implementing
|
> field of the implementing
|
filesystem. Its use is described in <A
|
filesystem. Its use is described in <A
|
HREF="fileio-synchronization.html"
|
HREF="fileio-synchronization.html"
|
>Chapter 24</A
|
>Chapter 24</A
|
>.</P
|
>.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_offset</I
|
>f_offset</I
|
></TT
|
></TT
|
> field records the current file
|
> field records the current file
|
position. It is the responsibility of the file operation functions to
|
position. It is the responsibility of the file operation functions to
|
keep this field up to date.</P
|
keep this field up to date.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_data</I
|
>f_data</I
|
></TT
|
></TT
|
> field contains private data
|
> field contains private data
|
placed here by the underlying filesystem. Normally this will be a
|
placed here by the underlying filesystem. Normally this will be a
|
pointer to, or handle on, the filesystem object that implements this
|
pointer to, or handle on, the filesystem object that implements this
|
file.</P
|
file.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_xops</I
|
>f_xops</I
|
></TT
|
></TT
|
> field contains a pointer to any
|
> field contains a pointer to any
|
extra type specific operation functions. For example, the socket I/O
|
extra type specific operation functions. For example, the socket I/O
|
system installs a pointer to a table of functions that implement the
|
system installs a pointer to a table of functions that implement the
|
standard socket operations.</P
|
standard socket operations.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_mte</I
|
>f_mte</I
|
></TT
|
></TT
|
> field contains a pointer to the
|
> field contains a pointer to the
|
parent mount table entry for this file. It is used mainly to implement
|
parent mount table entry for this file. It is used mainly to implement
|
the synchronization protocol. This may contain a pointer to some other
|
the synchronization protocol. This may contain a pointer to some other
|
data structure in file objects not derived from a filesystem.</P
|
data structure in file objects not derived from a filesystem.</P
|
><P
|
><P
|
>The <TT
|
>The <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_ops</I
|
>f_ops</I
|
></TT
|
></TT
|
> field contains a pointer to a
|
> field contains a pointer to a
|
table of file I/O operations. This has the following structure:</P
|
table of file I/O operations. This has the following structure:</P
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="PROGRAMLISTING"
|
CLASS="PROGRAMLISTING"
|
>struct CYG_FILEOPS_TAG
|
>struct CYG_FILEOPS_TAG
|
{
|
{
|
int (*fo_read) (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
|
int (*fo_read) (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
|
int (*fo_write) (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
|
int (*fo_write) (struct CYG_FILE_TAG *fp, struct CYG_UIO_TAG *uio);
|
int (*fo_lseek) (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
|
int (*fo_lseek) (struct CYG_FILE_TAG *fp, off_t *pos, int whence );
|
int (*fo_ioctl) (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
|
int (*fo_ioctl) (struct CYG_FILE_TAG *fp, CYG_ADDRWORD com,
|
CYG_ADDRWORD data);
|
CYG_ADDRWORD data);
|
int (*fo_select) (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);
|
int (*fo_select) (struct CYG_FILE_TAG *fp, int which, CYG_ADDRWORD info);
|
int (*fo_fsync) (struct CYG_FILE_TAG *fp, int mode );
|
int (*fo_fsync) (struct CYG_FILE_TAG *fp, int mode );
|
int (*fo_close) (struct CYG_FILE_TAG *fp);
|
int (*fo_close) (struct CYG_FILE_TAG *fp);
|
int (*fo_fstat) (struct CYG_FILE_TAG *fp, struct stat *buf );
|
int (*fo_fstat) (struct CYG_FILE_TAG *fp, struct stat *buf );
|
int (*fo_getinfo) (struct CYG_FILE_TAG *fp, int key, char *buf, int len );
|
int (*fo_getinfo) (struct CYG_FILE_TAG *fp, int key, char *buf, int len );
|
int (*fo_setinfo) (struct CYG_FILE_TAG *fp, int key, char *buf, int len );
|
int (*fo_setinfo) (struct CYG_FILE_TAG *fp, int key, char *buf, int len );
|
};</PRE
|
};</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
><P
|
><P
|
>It should be obvious from the names of most of these functions what
|
>It should be obvious from the names of most of these functions what
|
their responsibilities are. The <TT
|
their responsibilities are. The <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>fo_getinfo()</TT
|
>fo_getinfo()</TT
|
>
|
>
|
and <TT
|
and <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>fo_setinfo()</TT
|
>fo_setinfo()</TT
|
> function pointers, like their
|
> function pointers, like their
|
counterparts in the filesystem structure, implement minor control and
|
counterparts in the filesystem structure, implement minor control and
|
info functions such as <TT
|
info functions such as <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>fpathconf()</TT
|
>fpathconf()</TT
|
>.</P
|
>.</P
|
><P
|
><P
|
>The second argument to the <TT
|
>The second argument to the <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>fo_read()</TT
|
>fo_read()</TT
|
> and
|
> and
|
<TT
|
<TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>fo_write()</TT
|
>fo_write()</TT
|
> function pointers is a pointer to a
|
> function pointers is a pointer to a
|
UIO structure:</P
|
UIO structure:</P
|
><TABLE
|
><TABLE
|
BORDER="5"
|
BORDER="5"
|
BGCOLOR="#E0E0F0"
|
BGCOLOR="#E0E0F0"
|
WIDTH="70%"
|
WIDTH="70%"
|
><TR
|
><TR
|
><TD
|
><TD
|
><PRE
|
><PRE
|
CLASS="PROGRAMLISTING"
|
CLASS="PROGRAMLISTING"
|
>struct CYG_UIO_TAG
|
>struct CYG_UIO_TAG
|
{
|
{
|
struct CYG_IOVEC_TAG *uio_iov; /* pointer to array of iovecs */
|
struct CYG_IOVEC_TAG *uio_iov; /* pointer to array of iovecs */
|
int uio_iovcnt; /* number of iovecs in array */
|
int uio_iovcnt; /* number of iovecs in array */
|
off_t uio_offset; /* offset into file this uio corresponds to */
|
off_t uio_offset; /* offset into file this uio corresponds to */
|
ssize_t uio_resid; /* residual i/o count */
|
ssize_t uio_resid; /* residual i/o count */
|
enum cyg_uio_seg uio_segflg; /* see above */
|
enum cyg_uio_seg uio_segflg; /* see above */
|
enum cyg_uio_rw uio_rw; /* see above */
|
enum cyg_uio_rw uio_rw; /* see above */
|
};
|
};
|
|
|
struct CYG_IOVEC_TAG
|
struct CYG_IOVEC_TAG
|
{
|
{
|
void *iov_base; /* Base address. */
|
void *iov_base; /* Base address. */
|
ssize_t iov_len; /* Length. */
|
ssize_t iov_len; /* Length. */
|
};</PRE
|
};</PRE
|
></TD
|
></TD
|
></TR
|
></TR
|
></TABLE
|
></TABLE
|
><P
|
><P
|
>This structure encapsulates the parameters of any data transfer
|
>This structure encapsulates the parameters of any data transfer
|
operation. It provides support for scatter/gather operations and
|
operation. It provides support for scatter/gather operations and
|
records the progress of any data transfer. It is also compatible with
|
records the progress of any data transfer. It is also compatible with
|
the I/O operations of any BSD-derived network stacks and filesystems.</P
|
the I/O operations of any BSD-derived network stacks and filesystems.</P
|
><P
|
><P
|
>When a file is opened (or a file object created by some other means,
|
>When a file is opened (or a file object created by some other means,
|
such as <TT
|
such as <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>socket()</TT
|
>socket()</TT
|
> or <TT
|
> or <TT
|
CLASS="FUNCTION"
|
CLASS="FUNCTION"
|
>accept()</TT
|
>accept()</TT
|
>) it is the
|
>) it is the
|
responsibility of the filesystem open operation to initialize all the
|
responsibility of the filesystem open operation to initialize all the
|
fields of the object except the <TT
|
fields of the object except the <TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_ucount</I
|
>f_ucount</I
|
></TT
|
></TT
|
>,
|
>,
|
<TT
|
<TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_syncmode</I
|
>f_syncmode</I
|
></TT
|
></TT
|
> and
|
> and
|
<TT
|
<TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_mte</I
|
>f_mte</I
|
></TT
|
></TT
|
> fields. Since the
|
> fields. Since the
|
<TT
|
<TT
|
CLASS="STRUCTFIELD"
|
CLASS="STRUCTFIELD"
|
><I
|
><I
|
>f_flag</I
|
>f_flag</I
|
></TT
|
></TT
|
> field will already contain bits belonging to the FILEIO
|
> field will already contain bits belonging to the FILEIO
|
infrastructure, any changes to it must be made with the appropriate
|
infrastructure, any changes to it must be made with the appropriate
|
logical operations.</P
|
logical operations.</P
|
></DIV
|
></DIV
|
><DIV
|
><DIV
|
CLASS="NAVFOOTER"
|
CLASS="NAVFOOTER"
|
><HR
|
><HR
|
ALIGN="LEFT"
|
ALIGN="LEFT"
|
WIDTH="100%"><TABLE
|
WIDTH="100%"><TABLE
|
SUMMARY="Footer navigation table"
|
SUMMARY="Footer navigation table"
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WIDTH="100%"
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WIDTH="100%"
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BORDER="0"
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BORDER="0"
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CELLPADDING="0"
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CELLPADDING="0"
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CELLSPACING="0"
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CELLSPACING="0"
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><TR
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><TR
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><TD
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><TD
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WIDTH="33%"
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WIDTH="33%"
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ALIGN="left"
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ALIGN="left"
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VALIGN="top"
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VALIGN="top"
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><A
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><A
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HREF="fileio-mount-table.html"
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HREF="fileio-mount-table.html"
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ACCESSKEY="P"
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ACCESSKEY="P"
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>Prev</A
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>Prev</A
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></TD
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></TD
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><TD
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><TD
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WIDTH="34%"
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WIDTH="34%"
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ALIGN="center"
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ALIGN="center"
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VALIGN="top"
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VALIGN="top"
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><A
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><A
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HREF="ecos-ref.html"
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HREF="ecos-ref.html"
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ACCESSKEY="H"
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ACCESSKEY="H"
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>Home</A
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>Home</A
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></TD
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></TD
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><TD
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><TD
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WIDTH="33%"
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WIDTH="33%"
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ALIGN="right"
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ALIGN="right"
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VALIGN="top"
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VALIGN="top"
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><A
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><A
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HREF="fileio-directories.html"
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HREF="fileio-directories.html"
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ACCESSKEY="N"
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ACCESSKEY="N"
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>Next</A
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>Next</A
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></TD
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></TD
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></TR
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></TR
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><TR
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><TR
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><TD
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><TD
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WIDTH="33%"
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WIDTH="33%"
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ALIGN="left"
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ALIGN="left"
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VALIGN="top"
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VALIGN="top"
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>Mount Table</TD
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>Mount Table</TD
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><TD
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><TD
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WIDTH="34%"
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WIDTH="34%"
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ALIGN="center"
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ALIGN="center"
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VALIGN="top"
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VALIGN="top"
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><A
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><A
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HREF="fileio.html"
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HREF="fileio.html"
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ACCESSKEY="U"
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ACCESSKEY="U"
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>Up</A
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>Up</A
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></TD
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></TD
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><TD
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><TD
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WIDTH="33%"
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WIDTH="33%"
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ALIGN="right"
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ALIGN="right"
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VALIGN="top"
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VALIGN="top"
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>Directories</TD
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>Directories</TD
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></TR
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></TR
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></TABLE
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></TABLE
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></DIV
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></DIV
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></BODY
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></BODY
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></HTML
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></HTML
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