dpns_modifyusrmap - modify user entry corresponding to a given virtual
int dpns_modifyusrmap (uid_t uid, char *newname)
dpns_modifyusrmap modifies the user entry corresponding to a given
uid specifies the Virtual User Id.
specifies the new user name. It must be at most 255 characters
This function requires ADMIN privilege.
This routine returns 0 if the operation was successful or -1 if the
operation failed. In the latter case, serrno is set appropriately.
EACCES The caller does not have ADMIN privilege.
EFAULT newname is a NULL pointer.
EEXIST This user exists already.
EINVAL This uid does not exist in the internal mapping table or
the length of newname exceeds 255.
SENOSHOST Host unknown.
SENOSSERV Service unknown.
SECOMERR Communication error.
ENSNACT Name server is not running or is being shutdown.