linux/arch/um/drivers/null.c
Jeff Dike e99525f970 uml: console subsystem tidying
This does a lot of cleanup on the UML console system.  This patch should be
entirely non-functional.

The tidying is as follows:
	header cleanups - the includes should be closer to minimal and complete
	all printks now have a severity
	lots of style fixes
	fd_close is restructured a little in order to reduce the nesting
	some functions were calling the os_* wrappers when they can
call libc directly
	port_accept had a unnecessary variable
	it also tested a pid unecessarily before killing it
	some functions were made static
	xterm_free is gone, as it was identical to generic_free

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-16 09:43:04 -07:00

52 lines
970 B
C

/*
* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
* Licensed under the GPL
*/
#include <stddef.h>
#include <errno.h>
#include <fcntl.h>
#include "os.h"
#include "chan_user.h"
/* This address is used only as a unique identifer */
static int null_chan;
static void *null_init(char *str, int device, const struct chan_opts *opts)
{
return &null_chan;
}
static int null_open(int input, int output, int primary, void *d,
char **dev_out)
{
int fd;
*dev_out = NULL;
fd = open(DEV_NULL, O_RDWR);
return (fd < 0) ? -errno : fd;
}
static int null_read(int fd, char *c_out, void *unused)
{
return -ENODEV;
}
static void null_free(void *data)
{
}
const 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,
};