NAME

     acl_add_perm — add a permission to an ACL permission set

LIBRARY

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

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 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.

RETURN VALUE

     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

     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.

STANDARDS

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

SEE ALSO

     acl_clear_perms(3), acl_delete_perm(3), acl_get_perm(3), acl_get_permset(3),
     acl_set_permset(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 <andreas.gruenbacher@gmail.com>.