NAME

cd_xar, cd_cxar − reads the Extended Attribute Record for a CD-ROM file or directory from the CD-ROM

SYNOPSIS

#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 );

LIBRARY

Rock Ridge and X/Open Extensions to the CDFS library (libcdrom.so, libcdrom.a)

PARAMETERS

∗path
Points to the file or directory within the CD-ROM File System hierarchy.

fsecSpecifies 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. 

∗xarPoints 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

applen
Used in conjunction with esclen, determines how many bytes will be copied to the address specified by the ∗xar structure member app_use.

esclen
Used in conjunction with applen, determines how many bytes will be copied to the address specified by the ∗xar structure member esc_seq.

∗addr
Specifies the address where the function cd_cxar copies the XAR that is recorded on the CD-ROM. 

xarlen
Determines if part or all of the XAR will be read.

DESCRIPTION

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. 

RETURN VALUES

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. 

ERRORS

The function will fail if:

[EACCES]
Search permission is denied for a directory in ∗path or read permission is denied for the file or directory pointed to by ∗path. 

[EFAULT]
The address of ∗path or ∗addr is invalid. 

[EINTR]
A signal was caught during execution of the function.

[EINVAL]
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. 

[EMFILE]
{OPEN_MAX} file descriptors are currently open in the calling process. 

[Tru64 UNIX]  Either the OPEN_MAX value or the per-process soft descriptor limit is checked. 

[ENAMETOOLONG]
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. 

[ENFILE]
The system file table is full.

[ENODEV]
The Volume containing the File Section indicated by fsec is not mounted. 

[ENOENT]
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. 

[ENOTDIR]
A component of the ∗path prefix is not a directory. 

[ENXIO]
The CD-ROM is not in the drive or a read error occurred.

SEE ALSO

Functions: cd_drec(3)

Files: cdfs/xcdr.h, sys/cdrom.h