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Manual Pages  — ACL_ADD_PERM

NAME

acl_add_perm – add permissions to a permission set

CONTENTS

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 <Mt jedgar@fxp.org>.

ACL_ADD_PERM (3) June 25, 2009

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