ACL_GET_ENTRY(3) | Library Functions Manual | ACL_GET_ENTRY(3)

# NAME

`acl_get_entry` —
retrieve an ACL entry from an ACL

# LIBRARY

Standard C Library (libc, -lc)

# SYNOPSIS

`#include <sys/types.h>`
`#include <sys/acl.h>`

int
`acl_get_entry`(acl_t acl, int entry_id, acl_entry_t *entry_p);

# DESCRIPTION

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.

# RETURN VALUES

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. Otherwise, a value of -1 will be returned and the global variable errno will be set to indicate the error.

# ERRORS

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`.

# SEE ALSO

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)

# STANDARDS

POSIX.1e is described in IEEE POSIX.1e draft 17.

# HISTORY

POSIX.1e support was introduced in FreeBSD 4.0. The `acl_get_entry`() function was added in FreeBSD 5.0.

# AUTHORS

The `acl_get_entry`() function was written by Chris D. Faulhaber <jedgar@fxp.org>.

April 13, 2001 | NetBSD 10.1