cd_pvd(3) — Subroutines

NAME

cd_pvd, cd_cpvd − reads the Primary Volume Descriptor from a CD-ROM

SYNOPSIS

#include <sys/cdrom.h>
int cd_pvd(
        char ∗path,
        struct iso9660_pvd ∗pvd ); int cd_cpvd(
        char ∗path,
        char ∗addr );

LIBRARY

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

PARAMETERS

∗path
Points to a pathname that names a file or directory within a CD-ROM File System hierarchy, or to a block-special file for a CD-ROM File System.

∗pvd
Points to the iso9660_pvd structure that holds the contents of the Primary Volume Descriptor from the CD-ROM. The iso9660_pvd structure is defined in cdfs/xcdr.h, an include file that is called into sys/cdrom.h

∗addr
Points to the address to which the Primary Volume Descriptor on the CD-ROM is copied.

DESCRIPTION

The function cd_pvd() fills the ∗pvd structure with the contents of the Primary Volume Descriptor from the CD-ROM. To execute this function successfully, the user must have read or execute permission for the file or directory pointed to by ∗path

The function cd_cpvd() copies the complete Primary Volume Descriptor that is recorded on the CD-ROM to the address pointed to by ∗addr. The user must allocate {CD_PVDLEN} bytes for the Primary Volume Descriptor. The variable {CD_PVDLEN} is defined in cdfs/xcdr.h, an include file that is called into sys/cdrom.h.

RETURN VALUES

If successful, the value zero is returned. 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, directory, or block special file pointed to by ∗path.

[EFAULT]
The address of ∗path or ∗pvd 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 named file is a block special file and the CD-ROM is not recorded according to the ISO 9660 standard.

[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.

[ENOENT]
A component of ∗path does not exist or the ∗path argument points to an empty string.

[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. The named file is a block-special file and the device associated with the file does not exist.

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