nfs4_uid_to_name, nfs4_gid_to_name, nfs4_name_to_uid, nfs4_name_to_gid, nfs4_init_name_mapping,

       NFSv4  uses  names of the form user@domain.  To write code that helps the kernel map uid's (as rpc.idmapd
       does) or that processes NFSv4 ACLs, you need to be able to convert between NFSv4 names and local uids and
       gids.

       The nfs4_uid_to_name() and nfs4_gid_to_name() functions,  given  uid  or  gid  and  domain  (as  a  null-
       terminated string), write the corresponding nfsv4 name into the buffer provided in name, which must be of
       length at least len.

       The  nfs4_uid_to_owner() and nfs4_gid_to_group_owner() functions, given uid or gid and domain (as a null-
       terminated string), write the corresponding nfsv4 name into the buffer provided in name, which must be of
       length at least len.  If there is no valid mapping from uid or gid to name,  then  the  numerical  string
       representing uid or gid is returned instead.

       The nfs4_name_to_uid() and nfs4_name_to_gid() functions, given name (as a null-terminated string), return
       the corresponding uid or gid in the second parameter.

       The  nfs4_owner_to_uid()  and  nfs4_group_owner_to_gid()  functions,  given  name  (as  a null-terminated
       string), return the corresponding uid or gid in the second parameter.  If there is no valid mapping  from
       name to uid or gid the value for the user or group "nobody" will be returned instead.

       The  nfs4_init_name_mapping()  function  must  be  called  before using any of these functions.  It reads
       defaults from the configuration file at the provided path, usually "etc/idmapd.conf".

       The domain argument to the id-to-name functions is there to provide a hint to the name mapper in the case
       where an id might be mapped to names in multiple domains.  In most cases, this argument  should  just  be
       the  name returned in the domain argument to nfs4_get_default_domain() which should be called with server
       set to NULL.  The domain should be a buffer of length len.  The constant NFS4_MAX_DOMAIN_LEN may be  used
       to determine a reasonable value for that length.

       The  function  nfs4_get_grouplist(),  given  a  name, fills the provided array groups with up to *ngroups
       group IDs corresponding to which the user name belongs to, setting *ngroups to the actual number of  such
       groups.   If  the  user  belongs  to  more than *ngroups groups, then an error is returned and the actual
       number of groups is stored in *ngroups.

       Functions   nfs4_gss_princ_to_ids(),   nfs4_gss_princ_to_grouplist(),   nfs4_gss_princ_to_ids_ex(),   and
       nfs4_gss_princ_to_grouplist_ex()  are  used  to  convert  from  a  gss  principal  name  (as  returned by
       gss_display_name()) to a uid and gid, or list of gids.

       Finally, nfs4_set_debug() allows the application to set a debugging  level  to  produce  extra  debugging
       information  from  within  the  library.   The  optional logger function specifies an alternative logging
       function to call for the debug messages rather than the default internal function within the library.

       nfs4_uid_to_name,    nfs4_gid_to_name,    nfs4_name_to_uid,   nfs4_name_to_gid,   nfs4_init_name_mapping,
       nfs4_get_default_domain,  nfs4_gss_princ_to_ids,  nfs4_gss_princ_to_grouplist,  nfs4_gss_princ_to_ids_ex,
       nfs4_gss_princ_to_grouplist_ex, nfs4_set_debug - ID mapping routines used for NFSv4

       All functions return 0 or, in the case of error, -ERRNO.

                                                   2004-08-05                                nfs4_uid_to_name(3)

#include<nfs4_idmap.h>intnfs4_init_name_mapping(char*conffile);intnfs4_get_default_domain(char*server,char*domain,size_tlen);intnfs4_uid_to_name(uid_tuid,char*domain,char*name,size_tlen);intnfs4_uid_to_owner(uid_tuid,char*domain,char*name,size_tlen);intnfs4_gid_to_name(gid_tgid,char*domain,char*name,size_tlen);intnfs4_gid_to_owner(gid_tgid,char*domain,char*name,size_tlen);intnfs4_name_to_uid(char*name,uid_t*uid);intnfs4_name_to_gid(char*name,gid_t*gid);intnfs4_owner_to_uid(char*name,uid_t*uid);intnfs4_owner_to_gid(char*name,gid_t*gid);intnfs4_gss_princ_to_ids(char*secname,char*princ,uid_t*uid,gid_t*gid);intnfs4_gss_princ_to_grouplist(char*secname,char*princ,gid_t*groups,int*ngroups);intnfs4_gss_princ_to_ids_ex(char*secname,char*princ,uid_t*uid,gid_t*gid,extra_mapping_params**ex);intnfs4_gss_princ_to_grouplist_ex(char*secname,char*princ,gid_t*groups,int*ngroups,extra_mapping_params**ex);voidnfs4_set_debug(intdbg_level,void(*logger)(constchar*,...));