linux/arch/um/drivers/port_user.c
Jeff Dike 43f5b3085f uml: fix build when SLOB is enabled
Reintroduce uml_kmalloc for the benefit of UML libc code.  The
previous tactic of declaring __kmalloc so it could be called directly
from the libc side of the house turned out to be getting too intimate
with slab, and it doesn't work with slob.

So, the uml_kmalloc wrapper is back.  It calls kmalloc or whatever
that translates into, and libc code calls it.

kfree is left alone since that still works, leaving a somewhat
inconsistent API.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-13 08:02:22 -07:00

204 lines
3.7 KiB
C

/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
* Licensed under the GPL
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>
#include <netinet/in.h>
#include "chan_user.h"
#include "kern_constants.h"
#include "os.h"
#include "port.h"
#include "um_malloc.h"
#include "user.h"
struct port_chan {
int raw;
struct termios tt;
void *kernel_data;
char dev[sizeof("32768\0")];
};
static void *port_init(char *str, int device, const struct chan_opts *opts)
{
struct port_chan *data;
void *kern_data;
char *end;
int port;
if (*str != ':') {
printk(UM_KERN_ERR "port_init : channel type 'port' must "
"specify a port number\n");
return NULL;
}
str++;
port = strtoul(str, &end, 0);
if ((*end != '\0') || (end == str)) {
printk(UM_KERN_ERR "port_init : couldn't parse port '%s'\n",
str);
return NULL;
}
kern_data = port_data(port);
if (kern_data == NULL)
return NULL;
data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
if (data == NULL)
goto err;
*data = ((struct port_chan) { .raw = opts->raw,
.kernel_data = kern_data });
sprintf(data->dev, "%d", port);
return data;
err:
port_kern_free(kern_data);
return NULL;
}
static void port_free(void *d)
{
struct port_chan *data = d;
port_kern_free(data->kernel_data);
kfree(data);
}
static int port_open(int input, int output, int primary, void *d,
char **dev_out)
{
struct port_chan *data = d;
int fd, err;
fd = port_wait(data->kernel_data);
if ((fd >= 0) && data->raw) {
CATCH_EINTR(err = tcgetattr(fd, &data->tt));
if (err)
return err;
err = raw(fd);
if (err)
return err;
}
*dev_out = data->dev;
return fd;
}
static void port_close(int fd, void *d)
{
struct port_chan *data = d;
port_remove_dev(data->kernel_data);
os_close_file(fd);
}
const struct chan_ops port_ops = {
.type = "port",
.init = port_init,
.open = port_open,
.close = port_close,
.read = generic_read,
.write = generic_write,
.console_write = generic_console_write,
.window_size = generic_window_size,
.free = port_free,
.winch = 1,
};
int port_listen_fd(int port)
{
struct sockaddr_in addr;
int fd, err, arg;
fd = socket(PF_INET, SOCK_STREAM, 0);
if (fd == -1)
return -errno;
arg = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0) {
err = -errno;
goto out;
}
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
err = -errno;
goto out;
}
if (listen(fd, 1) < 0) {
err = -errno;
goto out;
}
err = os_set_fd_block(fd, 0);
if (err < 0)
goto out;
return fd;
out:
close(fd);
return err;
}
struct port_pre_exec_data {
int sock_fd;
int pipe_fd;
};
static void port_pre_exec(void *arg)
{
struct port_pre_exec_data *data = arg;
dup2(data->sock_fd, 0);
dup2(data->sock_fd, 1);
dup2(data->sock_fd, 2);
close(data->sock_fd);
dup2(data->pipe_fd, 3);
shutdown(3, SHUT_RD);
close(data->pipe_fd);
}
int port_connection(int fd, int *socket, int *pid_out)
{
int new, err;
char *argv[] = { "/usr/sbin/in.telnetd", "-L",
"/usr/lib/uml/port-helper", NULL };
struct port_pre_exec_data data;
new = accept(fd, NULL, 0);
if (new < 0)
return -errno;
err = os_pipe(socket, 0, 0);
if (err < 0)
goto out_close;
data = ((struct port_pre_exec_data)
{ .sock_fd = new,
.pipe_fd = socket[1] });
err = run_helper(port_pre_exec, &data, argv);
if (err < 0)
goto out_shutdown;
*pid_out = err;
return new;
out_shutdown:
shutdown(socket[0], SHUT_RDWR);
close(socket[0]);
shutdown(socket[1], SHUT_RDWR);
close(socket[1]);
out_close:
close(new);
return err;
}