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-rw-r--r--libcons/cons-lookup.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/libcons/cons-lookup.c b/libcons/cons-lookup.c
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+/* cons-lookup.c - Looking up virtual consoles.
+ Copyright (C) 2002 Free Software Foundation, Inc.
+ Written by Marcus Brinkmann.
+
+ This file is part of the GNU Hurd.
+
+ The GNU Hurd is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License as
+ published by the Free Software Foundation; either version 2, or (at
+ your option) any later version.
+
+ The GNU Hurd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
+
+#include <errno.h>
+#include <malloc.h>
+#include <sys/mman.h>
+
+#include "cons.h"
+
+/* Lookup the virtual console with number ID in the console CONS,
+ acquire a reference for it, and return it in R_VCONS. If CREATE is
+ true, the virtual console will be created if it doesn't exist yet.
+ If CREATE is true, and ID 0, the first free virtual console id is
+ used. CONS must be locked. */
+error_t
+cons_lookup (cons_t cons, int id, int create, vcons_t *r_vcons)
+{
+ vcons_t previous_vcons = 0;
+ vcons_t vcons;
+
+ if (!id && !create)
+ return EINVAL;
+
+ if (id)
+ {
+ if (cons->vcons_list && cons->vcons_list->id <= id)
+ {
+ previous_vcons = cons->vcons_list;
+ while (previous_vcons->next && previous_vcons->next->id <= id)
+ previous_vcons = previous_vcons->next;
+ if (previous_vcons->id == id)
+ {
+ /* previous_vcons->refcnt++; */
+ *r_vcons = previous_vcons;
+ return 0;
+ }
+ }
+ else if (!create)
+ return ESRCH;
+ }
+ else
+ {
+ id = 1;
+ if (cons->vcons_list && cons->vcons_list->id == 1)
+ {
+ previous_vcons = cons->vcons_list;
+ while (previous_vcons && previous_vcons->id == id)
+ {
+ id++;
+ previous_vcons = previous_vcons->next;
+ }
+ }
+ }
+
+ vcons = calloc (1, sizeof (struct vcons));
+ if (!vcons)
+ {
+ mutex_unlock (&vcons->cons->lock);
+ return ENOMEM;
+ }
+ vcons->cons = cons;
+ /* vcons->refcnt = 1; */
+ vcons->id = id;
+ mutex_init (&vcons->lock);
+ vcons->input = -1;
+ vcons->display = MAP_FAILED;
+ vcons->notify = NULL;
+
+#if 0
+ err = display_create (&vcons->display, cons->encoding ?: DEFAULT_ENCODING,
+ cons->foreground, cons->background);
+ if (err)
+ {
+ free (vcons->name);
+ free (vcons);
+ return err;
+ }
+
+ err = input_create (&vcons->input, cons->encoding ?: DEFAULT_ENCODING);
+ if (err)
+ {
+ display_destroy (vcons->display);
+ free (vcons->name);
+ free (vcons);
+ return err;
+ }
+#endif
+
+ cons_vcons_add (vcons);
+
+ /* Insert the virtual console into the doubly linked list. */
+ if (previous_vcons)
+ {
+ vcons->prev = previous_vcons;
+ if (previous_vcons->next)
+ {
+ previous_vcons->next->prev = vcons;
+ vcons->next = previous_vcons->next;
+ }
+ else
+ cons->vcons_last = vcons;
+ previous_vcons->next = vcons;
+ }
+ else
+ {
+ if (cons->vcons_list)
+ {
+ cons->vcons_list->prev = vcons;
+ vcons->next = cons->vcons_list;
+ }
+ else
+ cons->vcons_last = vcons;
+ cons->vcons_list = vcons;
+ }
+ *r_vcons = vcons;
+ return 0;
+}