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OSX 10.14 Mojave - man page for acl_get_permset_mask_np (mojave section 3)

ACL_PERMSET_MASK(3)					   BSD Library Functions Manual 				       ACL_PERMSET_MASK(3)

NAME
acl_permset_mask -- Manipulate ACL permissions using bitmasks
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h> #include <sys/acl.h> int acl_maximal_permset_mask_np(acl_permset_mask_t * mask_p); int acl_get_permset_mask_np(acl_entry_t entry_d, acl_permset_mask_t * mask_p); int acl_set_permset_mask_np(acl_entry_t entry_d, acl_permset_mask_t mask);
DESCRIPTION
The acl_permset_mask_t functions are a Darwin extension to the POSIX.1e ACL standard which allow manipulation of permissions in an acl_entry_t using a bitmask of type acl_permset_mask_t rather than a constructed acl_permset_t (as done by acl_get_permset(3) and acl_set_permset(3)). acl_permset_mask_t values may be constructed using bitwise operations over acl_perm_t values. acl_maximal_permset_mask_np() sets the value pointed to by mask_p to a bitmask of all valid acl_perm_t values. acl_get_permset_mask_np() returns via mask_p a bitmask of permissions set on the ACL entry entry_d. acl_set_permset_mask_np() sets the permissions of ACL entry entry_d to match the permission bitmask provided by mask.
RETURN VALUES
The acl_maximal_permset_mask_np() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. The acl_get_permset_mask_np() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate the error. The acl_set_permset_mask_np() 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_get_permset_mask_np() function fails if: [EINVAL] Argument entry_d is not a valid descriptor for an ACL entry. The acl_set_permset_mask_np() function fails if: [EINVAL] Argument entry_d is not a valid descriptor for an ACL entry. [EINVAL] Argument mask is not a valid bitmask of ACL permissions.
SEE ALSO
acl(3), acl_add_perm(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_permset(3), acl_set_permset(3), posix1e(3)
AUTHORS
Jeremy Huddleston Darwin August 24, 2010 Darwin

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