Imported Upstream version 0.2.1upstream/0.2.1

1 files changed, 75 insertions, 0 deletions

diff --git a/src/getfd.c b/src/getfd.c
new file mode 100644
index 0000000..69c37a3
--- /dev/null
+++ b/src/getfd.c
@@ -0,0 +1,75 @@
+/*
+ * Adapted from kbd-1.12
+ * License: GPL
+ *
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <linux/kd.h>
+#include <sys/ioctl.h>
+
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif /* HAVE_PATHS_H */
+
+/*
+ * getfd.c
+ *
+ * Get an fd for use with kbd/console ioctls.
+ * We try several things because opening /dev/console will fail
+ * if someone else used X (which does a chown on /dev/console).
+ */
+
+static int
+is_a_console (int fd)
+{
+    char arg;
+
+    arg = 0;
+    return (ioctl (fd, KDGKBTYPE, &arg) == 0
+	    && ((arg == KB_101) || (arg == KB_84)));
+}
+
+static int
+open_a_console (char *fnam)
+{
+    int fd;
+
+    fd = open (fnam, O_RDONLY);
+    if (fd < 0 && errno == EACCES)
+      fd = open(fnam, O_WRONLY);
+    if (fd < 0 || ! is_a_console (fd))
+      return -1;
+    return fd;
+}
+
+int getfd (void)
+{
+    int fd;
+
+    fd = open_a_console (_PATH_TTY);
+    if (fd >= 0)
+      return fd;
+
+    fd = open_a_console ("/dev/tty");
+    if (fd >= 0)
+      return fd;
+
+    fd = open_a_console (_PATH_CONSOLE);
+    if (fd >= 0)
+      return fd;
+
+    fd = open_a_console ("/dev/console");
+    if (fd >= 0)
+      return fd;
+
+    for (fd = 0; fd < 3; fd++)
+      if (is_a_console (fd))
+	return fd;
+
+    return -1;
+}