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FreeBSD 11.0 - man page for acl_get_entry (freebsd section 3)

ACL_GET_ENTRY(3)					   BSD Library Functions Manual 					  ACL_GET_ENTRY(3)

acl_get_entry -- retrieve an ACL entry from an ACL
Standard C Library (libc, -lc)
#include <sys/types.h> #include <sys/acl.h> int acl_get_entry(acl_t acl, int entry_id, acl_entry_t *entry_p);
The acl_get_entry() function is a POSIX.1e call that retrieves a descriptor for an ACL entry specified by the argument entry_d within the ACL indicated by the argument acl. If the value of entry_id is ACL_FIRST_ENTRY, then the function will return in entry_p a descriptor for the first ACL entry within acl. If a call is made to acl_get_entry() with entry_id set to ACL_NEXT_ENTRY when there has not been either an initial successful call to acl_get_entry(), or a previous successful call to acl_create_entry(), acl_delete_entry(), acl_dup(), acl_from_text(), acl_get_fd(), acl_get_file(), acl_set_fd(), acl_set_file(), or acl_valid(), then the result is unspecified.
If the acl_get_entry() function successfully obtains an ACL entry, a value of 1 is returned. If the ACL has no ACL entries, the acl_get_entry() returns a value of 0. If the value of entry_id is ACL_NEXT_ENTRY and the last ACL entry in the ACL has already been returned by a previous call to acl_get_entry(), a value of 0 will be returned until a successful call with entry_id of ACL_FIRST_ENTRY is made. Oth- erwise, a value of -1 will be returned and the global variable errno will be set to indicate the error.
The acl_get_entry() fails if: [EINVAL] Argument acl does not point to a valid ACL. Argument entry_id is neither ACL_FIRST_ENTRY nor ACL_NEXT_ENTRY.
acl(3), acl_calc_mask(3), acl_create_entry(3), acl_delete_entry(3), acl_dup(3), acl_from_text(3), acl_get_fd(3), acl_get_file(3), acl_init(3), acl_set_fd(3), acl_set_file(3), acl_valid(3), posix1e(3)
POSIX.1e is described in IEEE POSIX.1e draft 17.
POSIX.1e support was introduced in FreeBSD 4.0. The acl_get_entry() function was added in FreeBSD 5.0.
The acl_get_entry() function was written by Chris D. Faulhaber <>.
April 13, 2001 BSD