ACL_EQUIV_MODE(3) - Linux man page online | Library functions

Check for an equivalent ACL.

March 23, 2002
ACL_EQUIV_MODE(3) BSD Library Functions Manual ACL_EQUIV_MODE(3)


acl_equiv_mode — check for an equivalent ACL


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


#include <sys/types.h> #include <acl/libacl.h> int acl_equiv_mode(acl_t acl, mode_t *mode_p);


The acl_equiv_mode() function checks if the ACL pointed to by the argument acl contains only the required ACL entries of tag types ACL_USER_OBJ, ACL_GROUP_OBJ, and ACL_OTHER, and con‐ tains no permissions other that ACL_READ, ACL_WRITE or ACL_EXECUTE. If the ACL has this form, it can can be fully represented with the traditional file permission bits, and is con‐ sidered equivalent with the traditional file permission bits. If acl is an equivalent ACL and the pointer mode_p is not NULL, the value pointed to by mode_p is set to the value that defines the same owner, group and other permissions as con‐ tained in the ACL.


On success, this function returns the value 0 if acl is an equivalent ACL, and the value 1 if acl is not an equivalent ACL. On error, the value -1 is returned, and errno is set appro‐ priately.


If any of the following conditions occur, the acl_equiv_mode() function returns the value -1 and sets errno to the corresponding value: [EINVAL] The argument acl is not a valid pointer to an ACL.


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_from_mode(3), acl(5)


Written by Andreas Gruenbacher <>.
Linux ACL March 23, 2002 Linux ACL
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acl_equiv_mode(3) referred by acl(5) | acl_from_mode(3)
refer to acl(5) | acl_from_mode(3)
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