cd_defs(3) — Subroutines

NAME

cd_defs − sets or gets default values for the User or Group ID, or for file or directory permissions

SYNOPSIS

#include <sys/cdrom.h>
int cd_defs(
        char ∗path,
        int cmd,
        struct cd_defs ∗defs );

LIBRARY

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

PARAMETERS

∗path
Points to a mount point of a CD-ROM File System.

cmdCan be set to either {CD_SETDEFS} to set or {CD_GETDEFS} to get the default values for the UID, GID, or file or directory permissions for the mounted CD-ROM pointed to by ∗path. The variables {CD_SETDEFS} and {CD_GETDEFS} are defined in cdfs/xcdr.h, an include file that is called into sys/cdrom.h.

∗defs
Points to the cd_defs structure that holds the default values for the UID, GID, and file or directory permissions for the mounted CD-ROM pointed to by ∗path. The cd_defs structure is defined in cdfs/xcdr.h, an include file that is called into sys/cdrom.h.

DESCRIPTION

The cd_defs() routine sets or gets the default values for UIDs, GIDs, or file or directory permissions for a mounted CD-ROM.

RESTRICTIONS

Setting default values is restricted to users with the appropriate privileges. This function is intended to be used to set default values only directly after the CD-ROM is mounted and before its files and directories are accessed. Attempting to use this function to set default values after files or directories on the CD-ROM have been accessed may produce unpredictable results.

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 on the mount-point.

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

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

[EINVAL]
The argument ∗path does not point to a mount-point of a CD-ROM File System. The value of cmd or values of members of the cd_defs structure are 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.

[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.

[EPERM]
The user does not have the appropriate privileges to set values.

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