linux/arch/um/drivers/null.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

56 lines
1.2 KiB
C

/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <stdlib.h>
#include <errno.h>
#include "chan_user.h"
#include "os.h"
static int null_chan;
static void *null_init(char *str, int device, struct chan_opts *opts)
{
return(&null_chan);
}
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));
}
static int null_read(int fd, char *c_out, void *unused)
{
return(-ENODEV);
}
static void null_free(void *data)
{
}
struct chan_ops null_ops = {
.type = "null",
.init = null_init,
.open = null_open,
.close = generic_close,
.read = null_read,
.write = generic_write,
.console_write = generic_console_write,
.window_size = generic_window_size,
.free = null_free,
.winch = 0,
};
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/