ACL_CHECK
Section: C Library Functions (3)
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BSD mandoc
Linux ACL
NAME
acl_check
- check an ACL for validity
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
In sys/types.h
In acl/libacl.h
Ft int
Fn acl_check acl_t acl int *last
DESCRIPTION
The
Fn acl_check
function checks the ACL referred to by the argument
acl
for validity.
The three required entries ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER
must exist exactly once in the ACL. If the ACL contains any ACL_USER or
ACL_GROUP entries, then an ACL_MASK entry is also required. The ACL
may contain at most one ACL_MASK entry.
The user identifiers must be unique among all entries of type ACL_USER.
The group identifiers must be unique among all entries of type ACL_GROUP.
If the ACL referred to by
acl
is invalid,
Fn acl_check
returns a positive error code that indicates which type of error was detected.
The following symbolic error codes are defined:
- ACL_MULTI_ERROR
-
The ACL contains multiple entries that have a tag type
that may occur at most once.
- ACL_DUPLICATE_ERROR
-
The ACL contains multiple ACL_USER entries with the same user ID, or
multiple ACL_GROUP entries with the same group ID.
- ACL_MISS_ERROR
-
A required entry is missing.
- ACL_ENTRY_ERROR
-
The ACL contains an invalid entry tag type.
The
Fn acl_error
function can be used to translate error codes to text messages.
In addition, if the pointer
last
is not
NULL
Fn acl_check
assigns the number of the ACL entry at which the error was detected to
the value pointed to by
last
Entries are numbered starting with zero, in the order in which they would be
returned by the
Fn acl_get_entry
function.
RETURN VALUE
If successful, the
Fn acl_check
function returns
0
if the ACL referred to by
acl
is valid, and a positive error code if the ACL is invalid. Otherwise, a
value of
-1
is returned and the global variable
errno
is set to indicate the error.
ERRORS
If any of the following conditions occur, the
Fn acl_check
function returns
-1
and sets
errno
to the corresponding value:
- Bq Er EINVAL
-
The argument
acl
is not a valid pointer to an ACL.
STANDARDS
This is a non-portable, Linux specific extension to the ACL manipulation
functions defined in IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned).
SEE ALSO
acl_valid3,
acl(5)
AUTHOR
Written by
An Andreas Gruenbacher Aq
a.gruenbacher@bestbits.at .