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HP-UX was the first Unix to offer access control lists for file access permissions as an alternative to the standard Unix permissions system.
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acl_get_brand_np(3) [freebsd man page]

ACL_GET_BRAND_NP(3)					   BSD Library Functions Manual 				       ACL_GET_BRAND_NP(3)

NAME
acl_get_brand_np -- retrieve the ACL brand from an ACL entry LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <sys/acl.h> int acl_get_brand_np(acl_t acl, int *brand_p); DESCRIPTION
The acl_get_brand_np() function is a non-portable call that returns the ACL brand for the ACL acl. Upon successful completion, the location referred to by the argument brand_p will be set to the ACL brand of the ACL acl. Branding is an internal mechanism intended to prevent mixing POSIX.1e and NFSv4 entries by mistake. It's also used by the libc to determine how to print out the ACL. The first call to function that is specific for one particular brand - POSIX.1e or NFSv4 - "brands" the ACL. After that, calling function specific to another brand will result in error. RETURN VALUES
The acl_get_brand_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_brand_np() function fails if: [EINVAL] Argument acl does not point to a valid ACL. SEE ALSO
acl(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_get_brand_np() function was added in FreeBSD 8.0. AUTHORS
The acl_get_brand_np() function was written by Edward Tomasz Napierala <trasz@FreeBSD.org>. BSD
June 25, 2009 BSD

Check Out this Related Man Page

ACL_DELETE_ENTRY(3)					   BSD Library Functions Manual 				       ACL_DELETE_ENTRY(3)

NAME
acl_delete_entry, acl_delete_entry_np -- delete an ACL entry from an ACL LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <sys/types.h> #include <sys/acl.h> int acl_delete_entry(acl_t acl, acl_entry_t entry_d); int acl_delete_entry_np(acl_t acl, int index); DESCRIPTION
The acl_delete_entry() function is a POSIX.1e call that removes the ACL entry entry_d from ACL acl. The acl_delete_entry_np() function is a non-portable version that removes the ACL entry at position index from ACL acl. Positions are numbered starting from zero, i.e. calling acl_delete_entry_np() with index argument equal to zero will remove the first ACL entry. RETURN VALUES
The acl_delete_entry() 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_delete_entry() function fails if: [EINVAL] Argument acl does not point to a valid ACL. Argument entry_d is not a valid descriptor for an ACL entry in acl. Argument index is out of bounds. SEE ALSO
acl(3), acl_copy_entry(3), acl_get_entry(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_delete_entry() function was added in FreeBSD 5.0. AUTHORS
The acl_delete_entry() function was written by Chris D. Faulhaber <jedgar@fxp.org>. BSD
June 25, 2009 BSD

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