/ library calls / Acl_add_perm - Add Permissions To A Permission Set


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 , acl_clear_perms , acl_delete_perm , acl_get_brand_np , acl_get_permset , acl_set_permset , posix1e
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 <jedgar [ät] fxp.org>.
Next
acl_calc_mask - calculate and set ACL mask permissions
Previous
acl_add_perm - add a permission to an ACL permission set
Tags