acl_create_entry - Man Page

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

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

int
acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p);

The acl_create_entry() function creates a new ACL entry in the ACL pointed to by the contents of the pointer argument acl_p. On success, the function returns a descriptor for the new ACL entry via entry_p.

This function may cause memory to be allocated. The caller should free any releasable memory, when the new ACL is no longer required, by calling acl_free(3) with (void*)*acl_p as an argument. If the ACL working storage cannot be increased in the current location, then the working storage for the ACL pointed to by acl_p may be relocated and the previous working storage is released. A pointer to the new working storage is returned via acl_p.

The components of the new ACL entry are initialized in the following ways: the ACL tag type component contains ACL_UNDEFINED_TAG, the qualifier component contains ACL_UNDEFINED_ID, and the set of permissions has no permissions enabled. Any existing ACL entry descriptors that refer to entries in the ACL continue to refer to those entries.

The acl_create_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.

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

[EINVAL]

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

[ENOMEM]

The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management constraints.

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

acl_init(3), acl_delete_entry(3), acl_free(3), acl_create_entry(3), acl(5)

Derived from the FreeBSD manual pages written by Robert N M Watson ⟨rwatson@FreeBSD.org⟩, and adapted for Linux by Andreas Gruenbacher ⟨andreas.gruenbacher@gmail.com⟩.

acl(5), acl_delete_entry(3), acl_free(3), acl_get_entry(3), acl_get_qualifier(3), acl_get_tag_type(3), acl_set_qualifier(3), acl_set_tag_type(3).