acl_add_perm — add a permission to an ACL permission set

Derived from the FreeBSD manual pages written by Robert N M Watson <rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher <andreas.gruenbacher@gmail.com>. Linux ACL March 23, 2002 ACL_ADD_PERM(3)

The acl_add_perm() function adds the permission contained in the argument perm (one of ACL_READ, ACL_WRITE, ACL_EXECUTE) to the permission set referred to by the argument permset_d. An attempt to add a permission that is already contained in the permission set is not considered an error. Any existing descriptors that refer to permset_d continue to refer to that permission set.

If any of the following conditions occur, the acl_add_perm() function returns -1 and sets errno to the corresponding value: [EINVAL] The argument permset_d is not a valid descriptor for a permission set within an ACL entry. The argument perm does not contain a valid acl_perm_t value.

Linux Access Control Lists library (libacl, -lacl).

acl_add_perm — add a permission to an ACL permission set

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.

acl_clear_perms(3), acl_delete_perm(3), acl_get_perm(3), acl_get_permset(3), acl_set_permset(3), acl(5)

IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)

#include<sys/types.h>#include<sys/acl.h>intacl_add_perm(acl_permset_tpermset_d, acl_perm_tperm);