NAME
acl_add_perm – add permissions to a permission set
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
int
acl_add_perm(acl_permset_t permset_d, acl_perm_t perm);
DESCRIPTION
The acl_add_perm() function is a POSIX.1e call that adds the permission contained in perm to the permission set permset_d.
Note: it is not considered an error to attempt to add permissions that already exist in the permission set.
For POSIX.1e ACLs, valid values are:
| ACL_EXECUTE Execute permission |
| ACL_WRITE Write permission |
| ACL_READ Read permission |
For NFSv4 ACLs, valid values are:
| ACL_READ_DATA | Read permission |
| ACL_LIST_DIRECTORY | Same as ACL_READ_DATA |
| ACL_WRITE_DATA | Write permission, or permission to create files |
| ACL_ADD_FILE | Same as ACL_READ_DATA |
| ACL_APPEND_DATA | Permission to create directories. Ignored for files |
| ACL_ADD_SUBDIRECTORY | Same as ACL_APPEND_DATA |
| ACL_READ_NAMED_ATTRS | Ignored |
| ACL_WRITE_NAMED_ATTRS | Ignored |
| ACL_EXECUTE | Execute permission |
| ACL_DELETE_CHILD | Permission to delete files and subdirectories |
| ACL_READ_ATTRIBUTES | Permission to read basic attributes |
| ACL_WRITE_ATTRIBUTES | Permission to change basic attributes |
| ACL_DELETE | Permission to delete the object this ACL is placed on |
| ACL_READ_ACL | Permission to read ACL |
| ACL_WRITE_ACL | Permission to change the ACL and file mode |
| ACL_SYNCHRONIZE | Ignored |
Calling acl_add_perm() with perm equal to ACL_WRITE or ACL_READ brands the ACL as POSIX. Calling it with ACL_READ_DATA, ACL_LIST_DIRECTORY, ACL_WRITE_DATA, ACL_ADD_FILE, ACL_APPEND_DATA, ACL_ADD_SUBDIRECTORY, ACL_READ_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS, ACL_DELETE_CHILD, ACL_READ_ATTRIBUTES, ACL_WRITE_ATTRIBUTES, ACL_DELETE, ACL_READ_ACL, ACL_WRITE_ACL or ACL_SYNCHRONIZE brands the ACL as NFSv4.
RETURN VALUES
The acl_add_perm() 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
The acl_add_perm() function fails if:
- [EINVAL]
-
Argument permset_d is not a valid descriptor for a permission set within an ACL entry. Argument perm does not contain a valid acl_perm_t value. ACL is already branded differently.
SEE ALSO
acl(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_brand_np(3), acl_get_permset(3), acl_set_permset(3), posix1e(3)
STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
HISTORY
POSIX.1e support was introduced in FreeBSD 4.0. The acl_add_perm() function was added in FreeBSD 5.0.
AUTHORS
The acl_add_perm() function was written by Chris D. Faulhaber ⟨[email protected]⟩.