|Library Functions Manual
convert an ACL to text
Linux Access Control Lists library (libacl, -lacl).
const char *prefix, char
separator, int options);
function translates the ACL pointed to by the argument
acl into a
character string. This character string is composed of the ACL entries
contained in acl, in the entry text format described
on acl(5). Entries are separated from each other by the
separator character. If the argument
prefix is not
*)NULL, each entry is prefixed by this character string.
If the argument options is
0, ACL entries are converted using the entry tag
other. User IDs
and group IDs of ACL entries that contain such qualifiers are converted to
their corresponding names; if an identifier has no corresponding name, a
decimal number string is produced. The ACL text representation contains no
additional comments. A bitwise combinations of the following
options can be used to modify the result:
- Instead of the full tag type keywords, single letter abbreviations are
used. The abbreviation for
u, the abbreviation for
g, the abbreviation for
m, and the abbreviation for
- User IDs and group IDs are included as decimal numbers instead of names.
- A comment containing the effective permissions of the ACL entry is included after ACL entries that contain permissions which are ineffective because they are masked by an ACL_MASK entry. The ACL entry and the comment are separated by a tab character.
- A comment containing the effective permissions of the ACL entry is included after all ACL entries that are affected by an ACL_MASK entry. The comment is included even if the permissions contained in the ACL entry equal the effective permissions. The ACL entry and the comment are separated by a tab character.
- This option is used in combination with the TEXT_SOME_EFFECTIVE or TEXT_ALL_EFFECTIVE option. The number of tab characters inserted between the ACL entry and the comment is increased so that the comment is aligned to the fourth tab stop position. A tab width of 8 characters is assumed.
The ACL referred to by acl is not changed.
This function allocates any memory necessary to
contain the string and returns a pointer to the string. The caller should
free any releasable memory, when the new string is no longer required, by
with the (void*)char returned by
acl_to_any_text() as an argument.
On success, this function returns a pointer to the text
representation of the ACL. On error, a value of
*)NULL is returned, and errno is set
If any of the following conditions occur, the
acl_to_any_text() function returns a value of
(char *)NULL and sets errno to
the corresponding value:
- The argument acl is not a valid pointer to an ACL.
The ACL referenced by acl contains one or more improperly formed ACL entries, or for some other reason cannot be translated into the text form of an ACL.
- The character string to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.
This is a non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned).
Written by Andreas Gruenbacher ⟨firstname.lastname@example.org⟩.
|March 25, 2002