1da177e4c3
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!
310 lines
6.7 KiB
C
310 lines
6.7 KiB
C
/*
|
|
* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include "linux/list.h"
|
|
#include "linux/sched.h"
|
|
#include "linux/slab.h"
|
|
#include "linux/interrupt.h"
|
|
#include "linux/irq.h"
|
|
#include "linux/spinlock.h"
|
|
#include "linux/errno.h"
|
|
#include "asm/atomic.h"
|
|
#include "asm/semaphore.h"
|
|
#include "asm/errno.h"
|
|
#include "kern_util.h"
|
|
#include "kern.h"
|
|
#include "irq_user.h"
|
|
#include "irq_kern.h"
|
|
#include "port.h"
|
|
#include "init.h"
|
|
#include "os.h"
|
|
|
|
struct port_list {
|
|
struct list_head list;
|
|
atomic_t wait_count;
|
|
int has_connection;
|
|
struct completion done;
|
|
int port;
|
|
int fd;
|
|
spinlock_t lock;
|
|
struct list_head pending;
|
|
struct list_head connections;
|
|
};
|
|
|
|
struct port_dev {
|
|
struct port_list *port;
|
|
int helper_pid;
|
|
int telnetd_pid;
|
|
};
|
|
|
|
struct connection {
|
|
struct list_head list;
|
|
int fd;
|
|
int helper_pid;
|
|
int socket[2];
|
|
int telnetd_pid;
|
|
struct port_list *port;
|
|
};
|
|
|
|
static irqreturn_t pipe_interrupt(int irq, void *data, struct pt_regs *regs)
|
|
{
|
|
struct connection *conn = data;
|
|
int fd;
|
|
|
|
fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
|
|
if(fd < 0){
|
|
if(fd == -EAGAIN)
|
|
return(IRQ_NONE);
|
|
|
|
printk(KERN_ERR "pipe_interrupt : os_rcv_fd returned %d\n",
|
|
-fd);
|
|
os_close_file(conn->fd);
|
|
}
|
|
|
|
list_del(&conn->list);
|
|
|
|
conn->fd = fd;
|
|
list_add(&conn->list, &conn->port->connections);
|
|
|
|
complete(&conn->port->done);
|
|
return(IRQ_HANDLED);
|
|
}
|
|
|
|
#define NO_WAITER_MSG \
|
|
"****\n" \
|
|
"There are currently no UML consoles waiting for port connections.\n" \
|
|
"Either disconnect from one to make it available or activate some more\n" \
|
|
"by enabling more consoles in the UML /etc/inittab.\n" \
|
|
"****\n"
|
|
|
|
static int port_accept(struct port_list *port)
|
|
{
|
|
struct connection *conn;
|
|
int fd, socket[2], pid, ret = 0;
|
|
|
|
fd = port_connection(port->fd, socket, &pid);
|
|
if(fd < 0){
|
|
if(fd != -EAGAIN)
|
|
printk(KERN_ERR "port_accept : port_connection "
|
|
"returned %d\n", -fd);
|
|
goto out;
|
|
}
|
|
|
|
conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
|
|
if(conn == NULL){
|
|
printk(KERN_ERR "port_accept : failed to allocate "
|
|
"connection\n");
|
|
goto out_close;
|
|
}
|
|
*conn = ((struct connection)
|
|
{ .list = LIST_HEAD_INIT(conn->list),
|
|
.fd = fd,
|
|
.socket = { socket[0], socket[1] },
|
|
.telnetd_pid = pid,
|
|
.port = port });
|
|
|
|
if(um_request_irq(TELNETD_IRQ, socket[0], IRQ_READ, pipe_interrupt,
|
|
SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
|
|
"telnetd", conn)){
|
|
printk(KERN_ERR "port_accept : failed to get IRQ for "
|
|
"telnetd\n");
|
|
goto out_free;
|
|
}
|
|
|
|
if(atomic_read(&port->wait_count) == 0){
|
|
os_write_file(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
|
|
printk("No one waiting for port\n");
|
|
}
|
|
list_add(&conn->list, &port->pending);
|
|
return(1);
|
|
|
|
out_free:
|
|
kfree(conn);
|
|
out_close:
|
|
os_close_file(fd);
|
|
if(pid != -1)
|
|
os_kill_process(pid, 1);
|
|
out:
|
|
return(ret);
|
|
}
|
|
|
|
DECLARE_MUTEX(ports_sem);
|
|
struct list_head ports = LIST_HEAD_INIT(ports);
|
|
|
|
void port_work_proc(void *unused)
|
|
{
|
|
struct port_list *port;
|
|
struct list_head *ele;
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
list_for_each(ele, &ports){
|
|
port = list_entry(ele, struct port_list, list);
|
|
if(!port->has_connection)
|
|
continue;
|
|
reactivate_fd(port->fd, ACCEPT_IRQ);
|
|
while(port_accept(port)) ;
|
|
port->has_connection = 0;
|
|
}
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
DECLARE_WORK(port_work, port_work_proc, NULL);
|
|
|
|
static irqreturn_t port_interrupt(int irq, void *data, struct pt_regs *regs)
|
|
{
|
|
struct port_list *port = data;
|
|
|
|
port->has_connection = 1;
|
|
schedule_work(&port_work);
|
|
return(IRQ_HANDLED);
|
|
}
|
|
|
|
void *port_data(int port_num)
|
|
{
|
|
struct list_head *ele;
|
|
struct port_list *port;
|
|
struct port_dev *dev = NULL;
|
|
int fd;
|
|
|
|
down(&ports_sem);
|
|
list_for_each(ele, &ports){
|
|
port = list_entry(ele, struct port_list, list);
|
|
if(port->port == port_num) goto found;
|
|
}
|
|
port = kmalloc(sizeof(struct port_list), GFP_KERNEL);
|
|
if(port == NULL){
|
|
printk(KERN_ERR "Allocation of port list failed\n");
|
|
goto out;
|
|
}
|
|
|
|
fd = port_listen_fd(port_num);
|
|
if(fd < 0){
|
|
printk(KERN_ERR "binding to port %d failed, errno = %d\n",
|
|
port_num, -fd);
|
|
goto out_free;
|
|
}
|
|
if(um_request_irq(ACCEPT_IRQ, fd, IRQ_READ, port_interrupt,
|
|
SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, "port",
|
|
port)){
|
|
printk(KERN_ERR "Failed to get IRQ for port %d\n", port_num);
|
|
goto out_close;
|
|
}
|
|
|
|
*port = ((struct port_list)
|
|
{ .list = LIST_HEAD_INIT(port->list),
|
|
.wait_count = ATOMIC_INIT(0),
|
|
.has_connection = 0,
|
|
.port = port_num,
|
|
.fd = fd,
|
|
.pending = LIST_HEAD_INIT(port->pending),
|
|
.connections = LIST_HEAD_INIT(port->connections) });
|
|
spin_lock_init(&port->lock);
|
|
init_completion(&port->done);
|
|
list_add(&port->list, &ports);
|
|
|
|
found:
|
|
dev = kmalloc(sizeof(struct port_dev), GFP_KERNEL);
|
|
if(dev == NULL){
|
|
printk(KERN_ERR "Allocation of port device entry failed\n");
|
|
goto out;
|
|
}
|
|
|
|
*dev = ((struct port_dev) { .port = port,
|
|
.helper_pid = -1,
|
|
.telnetd_pid = -1 });
|
|
goto out;
|
|
|
|
out_free:
|
|
kfree(port);
|
|
out_close:
|
|
os_close_file(fd);
|
|
out:
|
|
up(&ports_sem);
|
|
return(dev);
|
|
}
|
|
|
|
int port_wait(void *data)
|
|
{
|
|
struct port_dev *dev = data;
|
|
struct connection *conn;
|
|
struct port_list *port = dev->port;
|
|
int fd;
|
|
|
|
atomic_inc(&port->wait_count);
|
|
while(1){
|
|
fd = -ERESTARTSYS;
|
|
if(wait_for_completion_interruptible(&port->done))
|
|
goto out;
|
|
|
|
spin_lock(&port->lock);
|
|
|
|
conn = list_entry(port->connections.next, struct connection,
|
|
list);
|
|
list_del(&conn->list);
|
|
spin_unlock(&port->lock);
|
|
|
|
os_shutdown_socket(conn->socket[0], 1, 1);
|
|
os_close_file(conn->socket[0]);
|
|
os_shutdown_socket(conn->socket[1], 1, 1);
|
|
os_close_file(conn->socket[1]);
|
|
|
|
/* This is done here because freeing an IRQ can't be done
|
|
* within the IRQ handler. So, pipe_interrupt always ups
|
|
* the semaphore regardless of whether it got a successful
|
|
* connection. Then we loop here throwing out failed
|
|
* connections until a good one is found.
|
|
*/
|
|
free_irq_by_irq_and_dev(TELNETD_IRQ, conn);
|
|
free_irq(TELNETD_IRQ, conn);
|
|
|
|
if(conn->fd >= 0) break;
|
|
os_close_file(conn->fd);
|
|
kfree(conn);
|
|
}
|
|
|
|
fd = conn->fd;
|
|
dev->helper_pid = conn->helper_pid;
|
|
dev->telnetd_pid = conn->telnetd_pid;
|
|
kfree(conn);
|
|
out:
|
|
atomic_dec(&port->wait_count);
|
|
return fd;
|
|
}
|
|
|
|
void port_remove_dev(void *d)
|
|
{
|
|
struct port_dev *dev = d;
|
|
|
|
if(dev->helper_pid != -1)
|
|
os_kill_process(dev->helper_pid, 0);
|
|
if(dev->telnetd_pid != -1)
|
|
os_kill_process(dev->telnetd_pid, 1);
|
|
dev->helper_pid = -1;
|
|
dev->telnetd_pid = -1;
|
|
}
|
|
|
|
void port_kern_free(void *d)
|
|
{
|
|
struct port_dev *dev = d;
|
|
|
|
port_remove_dev(dev);
|
|
kfree(dev);
|
|
}
|
|
|
|
static void free_port(void)
|
|
{
|
|
struct list_head *ele;
|
|
struct port_list *port;
|
|
|
|
list_for_each(ele, &ports){
|
|
port = list_entry(ele, struct port_list, list);
|
|
free_irq_by_fd(port->fd);
|
|
os_close_file(port->fd);
|
|
}
|
|
}
|
|
|
|
__uml_exitcall(free_port);
|