acl_get_entry man page on Archlinux

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

     acl_get_entry — get an ACL entry

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

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

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

     The acl_get_entry() function obtains a descriptor for an ACL entry as
     specified by entry_id within the ACL indicated by the argument acl.  If
     the value of entry_id is ACL_FIRST_ENTRY, then the function returns in
     entry_p a descriptor for the first ACL entry within acl.  If the value of
     entry_id is ACL_NEXT_ENTRY, then the function returns in entry_p a
     descriptor for the next 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_get_entry() follow‐
     ing a call to acl_calc_mask(), acl_copy_int(), 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
     effect is unspecified.

     Calls to acl_get_entry() do not modify any ACL entries. Subsequent opera‐
     tions using the returned ACL entry descriptor operate on the ACL entry
     within the ACL in working storage. The order of all existing entries in
     the ACL remains unchanged.	 Any existing ACL entry descriptors that refer
     to entries within the ACL continue to refer to those entries. Any exist‐
     ing ACL pointers that refer to the ACL referred to by acl continue to
     refer to the ACL.

     If the function successfully obtains an ACL entry, the function returns a
     value of 1.  If the ACL has no ACL entries, the function returns the
     value 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(), the function returns the value 0 until a successful call
     with an entry_id of ACL_FIRST_ENTRY is made. Otherwise, the value -1 is
     returned and errno is set to indicate the error.

     If any of the following conditions occur, the acl_get_entry() function
     returns -1 and sets errno to the corresponding value:

     [EINVAL]		The argument acl_p is not a valid pointer to an ACL.

			The argument entry_id is neither ACL_NEXT_ENTRY nor

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

     acl_calc_mask(3), acl_create_entry(3), acl_copy_entry(3),
     acl_delete_entry(3), acl_get_file(3), acl(5)

     Derived from the FreeBSD manual pages written by Robert N M Watson
     ⟨⟩, and adapted for Linux by Andreas Gruenbacher

Linux ACL			March 23, 2002			     Linux ACL

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