Manual Pages for UNIX Operating System command usage for man acl

System Calls                                               acl(2)



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

SYNOPSIS
     #include 

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


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


DESCRIPTION
     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       Used by the ZFS and NFSv4 file systems.



     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  directories
                      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  direc-
                      tories 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



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System Calls                                               acl(2)



                      be searchable. Write ACL access is required
                      to change the file's ACL.


     ACE_GETACL       Buffer aclbufp is filled  with  the  file's
                      ace_t  ACL entries. Read access to the file
                      is required and 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 required and all directories in the path
                      name must be searchable.


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

ERRORS
     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  ille-
                gal address.


     EINVAL     The  cmd  argument  is   not    GETACL,   SETACL,
                ACE_GETACL,  GETACLCNT, or ACE_GETACLCNT; the cmd
                argument is  SETACL and  nentries is less than 3;
                or  the cmd argument is  SETACL or ACE_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 insuffi-
                cient space in the file system to store the  ACL.



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System Calls                                               acl(2)



     ENOSYS     The cmd argument is  SETACL or ACE_SETACL and the
                file  specified by pathp resides on a file system
                that does not support  ACLs, or the  acl()  func-
                tion 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 or
                ACE_SETACL and  an  attempt  is  made  to  set  a
                default  ACL  on  a file type other than a direc-
                tory.


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

                The cmd argument is ACE_SETACL, but the  underly-
                ing  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 appropri-
                ate privilege.


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


ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|


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







SunOS 5.11          Last change: 10 Jan 2007                    3