#include "chan_user.h"
#include "os.h"
+/* This address is used only as a unique identifer */
static int null_chan;
-void *null_init(char *str, int device, struct chan_opts *opts)
+static void *null_init(char *str, int device, const struct chan_opts *opts)
{
return(&null_chan);
}
-int null_open(int input, int output, int primary, void *d, char **dev_out)
+static int null_open(int input, int output, int primary, void *d,
+ char **dev_out)
{
*dev_out = NULL;
return(os_open_file(DEV_NULL, of_rdwr(OPENFLAGS()), 0));
}
-int null_read(int fd, char *c_out, void *unused)
+static int null_read(int fd, char *c_out, void *unused)
{
return(-ENODEV);
}
-void null_free(void *data)
+static void null_free(void *data)
{
}
-struct chan_ops null_ops = {
+const struct chan_ops null_ops = {
.type = "null",
.init = null_init,
.open = null_open,