119 lines
2.3 KiB
Diff
119 lines
2.3 KiB
Diff
diff --git a/daemon/gdm-server.c b/daemon/gdm-server.c
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index 39def47..03488fd 100644
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--- daemon/gdm-server.c
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+++ daemon/gdm-server.c
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@@ -33,6 +33,8 @@
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#include <grp.h>
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#include <signal.h>
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#include <sys/resource.h>
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+#include <sys/ioctl.h>
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+#include <sys/vt.h>
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#include <glib.h>
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#include <glib/gi18n.h>
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@@ -150,6 +152,92 @@ _gdm_server_query_ck_for_display_device (GdmServer *server)
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return out;
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}
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+#ifndef O_NOCTTY
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+# define O_NOCTTY 0
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+#endif
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+
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+static int
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+open_vt (int vtno)
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+{
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+ char *vtname;
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+ int fd;
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+
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+ vtname = g_strdup_printf ("/dev/tty%d", vtno);
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+
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+ do {
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+ errno = 0;
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+ fd = open (vtname, O_RDWR | O_NOCTTY, 0);
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+ } while (errno == EINTR);
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+
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+ g_free (vtname);
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+ return fd;
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+}
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+
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+static gint
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+find_first_probably_free_vt (void)
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+{
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+ int fd, fdv;
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+ int vtno;
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+ unsigned short vtmask;
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+ struct vt_stat vtstat;
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+ guint v_state;
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+
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+ fdv = -1;
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+
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+ do {
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+ errno = 0;
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+ fd = open ("/dev/console", O_WRONLY | O_NOCTTY, 0);
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+ } while (errno == EINTR);
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+
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+ if (fd >= 0) {
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+ if (ioctl (fd, VT_GETSTATE, &vtstat) >= 0) {
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+ v_state = vtstat.v_state;
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+ } else {
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+ close (fd);
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+ v_state = 0;
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+ fd = -1;
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+ }
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+ } else {
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+ v_state = 0;
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+ }
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+
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+ if (fd < 0) {
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+ do {
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+ errno = 0;
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+ fd = open ("/dev/console", O_RDONLY | O_NOCTTY, 0);
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+ } while (errno == EINTR);
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+
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+ if (fd >= 0) {
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+ if (ioctl (fd, VT_GETSTATE, &vtstat) >= 0)
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+ v_state = vtstat.v_state;
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+ }
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+ }
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+
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+ for (vtno = 7, vtmask = 1 << vtno; vtmask; vtno++, vtmask <<= 1) {
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+ /* Is this console in use? */
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+ if (v_state & vtmask)
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+ continue;
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+
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+ /* No, try to open it */
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+ fdv = open_vt (vtno);
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+ if (fdv >= 0)
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+ break;
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+
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+ /* If we're here, kernel indicated that the console was free,
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+ * but we failed to open it. Just go on to higher VTs. */
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+ }
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+
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+ if (fdv >= 0)
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+ close (fdv);
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+ else
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+ vtno = -1;
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+
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+ if (fd >= 0)
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+ close (fd);
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+
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+ return vtno;
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+}
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+
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char *
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gdm_server_get_display_device (GdmServer *server)
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{
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@@ -310,6 +398,11 @@ gdm_server_resolve_command_line (GdmServer *server,
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if (vtarg != NULL && ! gotvtarg) {
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argv[len++] = g_strdup (vtarg);
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+ } else if (!query_in_arglist && !gotvtarg) {
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+ gint vtnum = find_first_probably_free_vt ();
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+
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+ if (vtnum > 0)
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+ argv [len++] = g_strdup_printf ("vt%d", vtnum);
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}
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argv[len++] = NULL;
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