diff --git a/common/gdm-common.h b/common/gdm-common.h

--- a/common/gdm-common.h

+++ b/common/gdm-common.h

@@ -25,6 +25,11 @@

 #include "gdm-common-unknown-origin.h"

+#ifdef __sun

+#define GDM_DT_DIR "/var/dt"

+#define GDM_SDTLOGIN_DIR "/var/dt/sdtlogin"

+#endif

+

 G_BEGIN_DECLS

 gboolean       gdm_is_version_unstable            (void);

diff --git a/daemon/gdm-server.c b/daemon/gdm-server.c

--- a/daemon/gdm-server.c

+++ b/daemon/gdm-server.c

@@ -33,6 +33,9 @@

 #include <grp.h>

 #include <signal.h>

 #include <sys/resource.h>

+#ifdef __sun

+#include <sys/param.h>

+#endif

 #include <glib.h>

 #include <glib/gi18n.h>

                 _exit (SERVER_ABORT);

         }

+#if __sun

+        {

+                /* Remove old communication pipe, if present */

+                char old_pipe[MAXPATHLEN];

+                char *p, *tmp;

+                int display_num;

+

+                if ((tmp = strstr (server->priv->display_name, ":")) != NULL) {

+                        tmp++;

+                        display_num = g_ascii_strtod (tmp, &p);

+

+                        if (errno == 0) {

+                                sprintf (old_pipe, "%s/%d", GDM_SDTLOGIN_DIR, display_num);

+                                g_unlink (old_pipe);

+                        }

+                }

+        }

+#endif

+

         env = get_server_environment (server);

         freeme = g_strjoinv (" ", argv);

diff --git a/daemon/gdm-session-worker.c b/daemon/gdm-session-worker.c

--- a/daemon/gdm-session-worker.c

+++ b/daemon/gdm-session-worker.c

@@ -36,6 +36,13 @@

 #include <libdevinfo.h>

 #endif  /* HAVE_LOGINDEVPERM */

+#if __sun

+#include <sys/param.h>

+#define GDM_PAM_QUAL

+#else

+#define GDM_PAM_QUAL const

+#endif

+

 #include <security/pam_appl.h>

 #include <glib.h>

 #endif

 #include "gdm-session-settings.h"

+#include "gdm-common.h"

 #define GDM_SESSION_WORKER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GDM_TYPE_SESSION_WORKER, GdmSessionWorkerPrivate))

 static void     queue_state_change              (GdmSessionWorker      *worker);

 typedef int (* GdmSessionWorkerPamNewMessagesFunc) (int,

-                                                    const struct pam_message **,

+                                                    GDM_PAM_QUAL struct pam_message **,

                                                     struct pam_response **,

                                                     gpointer);

 G_DEFINE_TYPE (GdmSessionWorker, gdm_session_worker, G_TYPE_OBJECT)

+#ifdef __sun

+void

+solaris_xserver_cred (char * username, struct passwd *passwd_entry, const char *x11_display_name)

+{

+        struct stat statbuf;

+        struct group *gr;

+        gid_t  groups[NGROUPS_UMAX];

+        char *home, *disp, *tmp, *p, pipe[MAXPATHLEN], info[MAXPATHLEN];

+        int display_number = 0;

+        int retval, fd, i, nb;

+        int ngroups;

+

+        if (g_access (passwd_entry->pw_dir, F_OK) != 0) {

+                g_debug ("solaris_xserver_cred: no HOME dir access\n");

+                return;

+        }

+

+        /*

+         * Handshake with server. Make sure it created a pipe.

+         * Open and write.

+         */

+        if ((tmp = strstr (x11_display_name, ":")) != NULL) {

+                tmp++;

+                display_number = g_ascii_strtod (tmp, &p);

+

+                if (errno != 0) {

+                        g_debug ("solaris_xserver_cred: problem getting display number\n");

+                        return;

+                }

+        }

+

+        sprintf (pipe, "%s/%d", GDM_SDTLOGIN_DIR, display_number);

+

+        if (g_stat (GDM_SDTLOGIN_DIR, &statbuf) == 0) {

+                if (! statbuf.st_mode & S_IFDIR) {

+                        g_debug ("solaris_xserver_cred: %s is not a directory\n",

+                                 GDM_SDTLOGIN_DIR);

+                        return;

+                }

+        } else {

+                g_debug ("solaris_xserver_cred: %s does not exist\n", GDM_SDTLOGIN_DIR);

+                return;

+        }

+

+        fd = open (pipe, O_RDWR);

+        g_unlink (pipe);

+

+        if (fd < 0) {

+                g_debug ("solaris_xserver_cred: could not open %s\n", pipe);

+                return;

+        }

+        if (fstat (fd, &statbuf) == 0 ) {

+                if ( ! statbuf.st_mode & S_IFIFO) {

+                        close (fd);

+                        g_debug ("solaris_xserver_cred: %s is not a pipe\n", pipe);

+                        return;

+                }

+        } else {

+                close (fd);

+                g_debug ("solaris_xserver_cred: %s does not exist\n", pipe);

+                return;

+        }

+

+        sprintf (info, "GID=\"%d\"; ", passwd_entry->pw_gid);

+        nb = write (fd, info, strlen (info));

+        g_debug ("solaris_xserver_cred: %s\n", info);

+

+        if (initgroups (username, passwd_entry->pw_gid) == -1) {

+                ngroups = 0;

+        } else {

+                ngroups = getgroups (NGROUPS_UMAX, groups);

+        }

+

+        for (i=0; i < ngroups; i++) {

+                sprintf (info, "G_LIST_ID=\"%u\" ", groups[i]);

+                nb = write (fd, info, strlen (info));

+                g_debug ("solaris_xserver_cred: %s\n", info);

+        }

+

+        if (ngroups > 0) {

+                sprintf (info, ";");

+                write (fd, info, strlen (info));

+        }

+

+        sprintf (info, " HOME=\"%s\" ", passwd_entry->pw_dir);

+        nb = write (fd, info, strlen (info));

+        g_debug ("solaris_xserver_cred: %s\n", info);

+

+        sprintf (info, " UID=\"%d\" EOF=\"\";", passwd_entry->pw_uid);

+        nb = write (fd, info, strlen (info));

+        g_debug ("solaris_xserver_cred: %s\n", info);

+

+        /*

+         * Handshake with server. Make sure it read the pipe.

+         *

+         * Close file descriptor.

+         */

+        close (fd);

+

+        return;

+}

+#endif

+

 GQuark

 gdm_session_worker_error_quark (void)

 {

 gdm_session_worker_get_username (GdmSessionWorker  *worker,

                                  char             **username)

 {

+#ifdef __sun

+        gpointer item;

+#else

         gconstpointer item;

+#endif

         g_assert (worker->priv->pam_handle != NULL);

 static int

 gdm_session_worker_pam_new_messages_handler (int                        number_of_messages,

-                                             const struct pam_message **messages,

+                                             GDM_PAM_QUAL struct pam_message **messages,

                                              struct pam_response      **responses,

                                              GdmSessionWorker          *worker)

 {

         passwd_entry = getpwnam (worker->priv->username);

+#ifdef __sun

+        solaris_xserver_cred (worker->priv->username,

+                              passwd_entry,

+                              worker->priv->x11_display_name);

+#endif

 #ifdef  HAVE_LOGINDEVPERM

         /*

          * Only do logindevperm processing if /dev/console or

--- a/daemon/main.c

+++ b/daemon/main.c

                 { NULL }

         };

+#ifdef __sun

+        {

+                struct stat statbuf;

+                int r;

+

+                r = stat (GDM_DT_DIR, &statbuf);

+                if (r < 0) {

+                        g_mkdir (GDM_DT_DIR, 0755);

+                }

+

+                g_remove (GDM_SDTLOGIN_DIR);

+                g_mkdir (GDM_SDTLOGIN_DIR, 0700);

+        }

+#endif

+

         bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);

         textdomain (GETTEXT_PACKAGE);

         setlocale (LC_ALL, "");