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cd_xar(3) Library Functions Manual cd_xar(3) NAME cd_xar, cd_cxar - Reads the Extended Attribute Record for a CD-ROM file or directory from the CD-ROM LIBRARY Rock Ridge and X/Open Extensions to the CDFS library (libcdrom.so, libcdrom.a) 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 ); PARAMETERS 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 At- tribute 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. 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 di- rectory 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 indi- cate the error. ERRORS 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. [DIGITAL] Either the OPEN_MAX value or the per-process soft de- scriptor limit is checked. The length of the *path string ex- ceeds {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 in- dicated 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. RELATED INFORMATION Files: cdfs/xcdr.h, sys/cdrom.h. Functions: cd_drec(3) delim off cd_xar(3)