acl_set_file man page
acl_set_file — set an ACL by filename
Linux Access Control Lists library (libacl, -lacl).
acl_set_file(const char *path_p, acl_type_t type, acl_t acl);
The acl_set_file() function associates an access ACL with a file or directory, or associates a default ACL with a directory. The pathname for the file or directory is pointed to by the argument path_p.
The effective user ID of the process must match the owner of the file or directory or the process must have the CAP_FOWNER capability for the request to succeed.
The value of the argument type is used to indicate whether the access ACL or the default ACL associated with path_p is being set. If the type parameter is ACL_TYPE_ACCESS, the access ACL of path_p shall be set. If the type parameter is ACL_TYPE_DEFAULT, the default ACL of path_p shall be set. If the argument type specifies a type of ACL that cannot be associated with path_p, then the function fails.
The acl parameter must reference a valid ACL according to the rules described on the acl_valid(3) manual page if the type parameter is ACL_TYPE_ACCESS, and must either reference a valid ACL or an ACL with zero ACL entries if the type parameter is ACL_TYPE_DEFAULT. If the acl parameter references an empty ACL, then the acl_set_file() function removes any default ACL associated with the directory referred to by the path_p parameter.
The acl_set_file() 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_set_file() function returns
-1 and sets errno to the corresponding value:
- Search permission is denied for a component of the path prefix or the object exists and the process does not have appropriate access rights.
Argument type specifies a type of ACL that cannot be associated with path_p.
- The argument acl does not point to a valid ACL.
The ACL has more entries than the file referred to by path_p can obtain.
The type parameter is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT.
The type parameter is ACL_TYPE_DEFAULT, but the file referred to by path_p is not a directory.
- The length of the argument path_p is too long.
- The named object does not exist or the argument path_p points to an empty string.
- The directory or file system that would contain the new ACL cannot be extended or the file system is out of file allocation resources.
- A component of the path prefix is not a directory.
- The file identified by path_p cannot be associated with the ACL because the file system on which the file is located does not support this.
- The process does not have appropriate privilege to perform the operation to set the ACL.
- This function requires modification of a file system which is currently read-only.
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
The behavior of acl_set_file() when the acl parameter refers to an empty ACL and the type parameter is ACL_TYPE_DEFAULT is an extension in the Linux implementation, in order that all values returned by acl_get_file() can be passed to acl_set_file(). The POSIX.1e function for removing a default ACL is acl_delete_def_file().
acl_delete_def_file(3), acl_get_file(3), acl_set_fd(3), acl_valid(3), acl(5)
Derived from the FreeBSD manual pages written by⟨rwatson@FreeBSD.org⟩, and adapted for Linux by ⟨firstname.lastname@example.org⟩.
acl(5), acl_delete_def_file(3), acl_get_file(3), acl_set_fd(3), acl_valid(3), explain(1), explain(3), explain_acl_set_file(3), explain_acl_set_file_or_die(3).