ACL_FROM_MODE(3) Library Functions Manual ACL_FROM_MODE(3)

create an ACL from file permission bits

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

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

acl_from_mode(mode_t mode);

The acl_from_mode() function creates a minimal ACL that contains the three entries with tag types ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER, with permissions corresponding to the owner, group, and other permission bits of its argument mode.

On success, this function returns a pointer to the working storage. On error, a value of (acl_t)NULL is returned, and errno is set appropriately.

If any of the following conditions occur, the acl_from_mode() function returns a value of (acl_t)NULL and sets errno to the corresponding value:
The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management constraints.

This is a non-portable, Linux specific extension to the ACL manipulation functions defined in IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned).

acl_equiv_mode(3), acl_get_file(3), acl(5)

Written by Andreas Gruenbacher ⟨⟩.
March 23, 2002 Linux ACL