acl(2)                                                                                                                                      acl(2)

NAME

       acl, facl - get or set a file's Access Control List (ACL)

SYNOPSIS

       #include <sys/acl.h>

       int acl(char *pathp, int cmd, int nentries, void aclbufp);

       int facl(int fildes, int cmd, int nentries, void aclbufp);

       The acl() and facl() functions get or set the  ACL of a file whose name is given by pathp or referenced by the open file descriptor fildes.
       The nentries argument specifies how many ACL entries fit into buffer aclbufp. The acl() function is used to manipulate ACL on  file  system
       objects.

       The following types are supported for aclbufp:

       aclent_t        Used by the UFS file system.

       ace_t           Currently unused.

       The following values for cmd are supported:

       SETACL          nentries aclent_t ACL entries, specified in buffer aclbufp, are stored in the file's  ACL. All directories in the path name
                       must be searchable.

       GETACL          Buffer aclbufp is filled with the file's  aclent_t ACL entries. Read access to the file is not required, but  all  directo-
                       ries in the path name must be searchable.

       GETACLCNT       The  number of entries in the file's aclent_t ACL is returned. Read access to the file is not required, but all directories
                       in the path name must be searchable.

       ACE_SETACL      nentries ace_t ACL entries, specified in buffer aclbufp, are stored in the file's ACL. All directories  in  the  path  name
                       must be searchable.

       ACE_GETACL      Buffer aclbufp is filled with the file's ace_t ACL entries. Read access to the file is not required, but all directories in
                       the path name must be searchable.

       ACE_GETACLCNT   The number of entries in the file's ace_t ACL is  returned. Read access to the file is not required, but all directories in
                       the path name must be searchable.

       Upon  successful  completion,  acl()  and facl() return 0 if cmd is  SETACL. If cmd is  GETACL or  GETACLCNT, the number of  ACL entries is
       returned. Otherwise, -1 is returned and errno is set to indicate the error.

       The acl() function will fail if:

       EACCES          The caller does not have access to a component of the pathname.

       EFAULT          The pathp or aclbufp argument points to an illegal address.

       EINVAL          The cmd argument is not  GETACL, SETACL, or  GETACLCNT; the cmd argument is  SETACL and  nentries is less than  3;  or  the
                       cmd argument is  SETACL and the  ACL specified in  aclbufp is not valid.

       EIO             A disk  I/O  error has occurred while storing or retrieving the  ACL.

       ENOENT          A component of the path does not exist.

       ENOSPC          The  cmd  argument  is   GETACL  and nentries is less than the number of entries in the file's  ACL, or the cmd argument is
                       SETACL and there is insufficient space in the file system to store the  ACL.

       ENOSYS          The cmd argument is  SETACL and the file specified by pathp resides on a file system that does not support   ACLs,  or  the
                       acl() function is not supported by this implementation.

       ENOTDIR         A component of the path specified by pathp is not a directory, or the cmd argument is  SETACL and an attempt is made to set
                       a default  ACL on a file type other than a directory.

       ENOTSUP         The cmd argument is GETACL, but the ACL is composed of ace_t entries, and the ACL cannot be translated into aclent_t form.

                       The cmd is ACE_SETACL, but the underlying filesystem only supports ACLs composed of aclent_t entries and the ACL could  not
                       be translated into aclent_t form.

       EPERM           The effective user ID does not match the owner of the file and the process does not have appropriate privilege.

       EROFS           The cmd argument is  SETACL and the file specified by pathp resides on a file system that is mounted read-only.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE  TYPE        |      ATTRIBUTE  VALUE       |
       +-----------------------------+-----------------------------+
       |Interface  Stability         |Evolving                     |
       +-----------------------------+-----------------------------+

       getfacl(1), setfacl(1), aclcheck(3SEC), aclsort(3SEC)

                                                                    9 Sep 2004                                                              acl(2)