cd_xar, cd_cxar - reads the Extended Attribute Record for
a CD-ROM file or directory from the CD-ROM
#include <sys/cdrom.h>
int cd_xar(
char *path,
int fsec,
struct iso9660_xar *xar,
int applen,
int esclen ); int cd_cxar(
char *path,
int fsec,
char *addr,
int xarlen );
Rock Ridge and X/Open Extensions to the CDFS library
(libcdrom.so, libcdrom.a)
Points to the file or directory within the CD-ROM File
System hierarchy. Specifies the File Section of the file
or directory pointed to by *path, with the numbering
beginning at one. If fsec is set to -1, the last File Section
of the named file or the only File Section of the
named directory is assumed. Points to the iso9660_xar
structure that holds the Extended Attribute Record (XAR)
information. The iso9660_xar structure is defined in
cdfs/xcdr.h, an include file that is called into
sys/cdrom.h Used in conjunction with esclen, determines
how many bytes will be copied to the address specified by
the *xar structure member app_use. Used in conjunction
with applen, determines how many bytes will be copied to
the address specified by the *xar structure member
esc_seq. Specifies the address where the function cd_cxar
copies the XAR that is recorded on the CD-ROM. Determines
if part or all of the XAR will be read.
The cd_xar() routine fills the *xar structure with the
contents of the Extended Attribute Record (XAR) that is
associated with the file or directory pointed to by *path.
The total number of logical blocks of an XAR can be
obtained by calling the cd_drec() function. The Logical
Block Size in bytes can be obtained by calling the
cd_pvd() function. The length of the fixed part of the XAR
is given by {CD_XARFIXL}. The variable {CD_XARFIXL} is
defined in cdfs/xcdr.h, an include file that is called
into sys/cdrom.h.
The cd_cxar() function copies the XAR as recorded on the
CD-ROM to the address pointed to by *addr.
If successful, the routines return the following values:
The cd_xar() function returns the number of bytes copied
for the variable part of the XAR.
The cd_cxar() function returns the number of bytes copied.
If unsuccessful, the integer -1 is returned and errno is
set to indicate the error.
The function will fail if: Search permission is denied for
a directory in *path or read permission is denied for the
file or directory pointed to by *path. The address of
*path or *addr is invalid. A signal was caught during
execution of the function. The argument *path points to a
file or directory that is not within the CD-ROM file hierarchy.
The value of fsec or xarlen is invalid. {OPEN_MAX}
file descriptors are currently open in the calling process.
[Tru64 UNIX] Either the OPEN_MAX value or the perprocess
soft descriptor limit is checked. The
length of the *path string exceeds {PATH_MAX}, or a
pathname component is longer than {NAME_MAX} while
{_POSIX_NO_TRUNC} is in effect. The system file
table is full. The Volume containing the File Section
indicated by fsec is not mounted. A component
of *path does not exist or the *path argument
points to an empty string. The File Section indicated
by fsec has no XAR. A component of the *path
prefix is not a directory. The CD-ROM is not in
the drive or a read error occurred.
Functions: cd_drec(3)
Files: cdfs/xcdr.h, sys/cdrom.h
cd_xar(3)
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