NAME¶
acl_calc_mask
—
calculate the file group class mask
LIBRARY¶
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS¶
#include
<sys/types.h>
#include
<sys/acl.h>
int
acl_calc_mask
(
acl_t
*acl_p);
DESCRIPTION¶
The
acl_calc_mask
() function calculates and
sets the permissions associated with the ACL_MASK ACL entry of the ACL
referred to by
acl_p. The value of the new
permissions is the union of the permissions granted by all entries of tag type
ACL_GROUP, ACL_GROUP_OBJ, or ACL_USER. If the ACL referred to by
acl_p already contains an ACL_MASK entry, its
permissions are overwritten; if it does not contain an ACL_MASK entry, one is
added.
If the ACL referred to by
acl_p does not
contain enough space for the new ACL entry, then additional working storage
may be allocated. If the working storage cannot be increased in the current
location, then it may be relocated and the previous working storage is
released and a pointer to the new working storage is returned via
acl_p.
The order of existing entries in the ACL is undefined after this function.
Any existing ACL entry descriptors that refer to entries in the ACL continue to
refer to those entries. Any existing ACL pointers that refer to the ACL
referred to by
acl_p continue to refer to the
ACL.
RETURN VALUE¶
The
acl_calc_mask
() function returns the
value 0 if successful; otherwise the value -1 is returned and
the global variable
errno is set to indicate
the error.
ERRORS¶
If any of the following conditions occur, the
acl_calc_mask
() function returns
-1
and sets
errno to
the corresponding value:
- [
EINVAL
]
- The argument acl is not a valid pointer
to an ACL.
- [
ENOMEM
]
- The
acl_calc_mask
() function is unable
to allocate the memory required for an ACL_MASK ACL entry.
STANDARDS¶
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
SEE ALSO¶
acl_check(3),
acl_get_entry(3),
acl_valid(3),
acl(5)
AUTHOR¶
Derived from the FreeBSD manual pages written by
Robert N M Watson
⟨rwatson@FreeBSD.org⟩, and adapted for Linux by
Andreas Gruenbacher
⟨a.gruenbacher@bestbits.at⟩.