2005-04-17 06:20:36 +08:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
|
|
|
|
* Licensed under the GPL
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <errno.h>
|
|
|
|
#include <termios.h>
|
|
|
|
#include <string.h>
|
|
|
|
#include <signal.h>
|
|
|
|
#include <sys/stat.h>
|
|
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include "kern_util.h"
|
|
|
|
#include "user_util.h"
|
|
|
|
#include "chan_user.h"
|
|
|
|
#include "user.h"
|
|
|
|
#include "helper.h"
|
|
|
|
#include "os.h"
|
|
|
|
#include "choose-mode.h"
|
|
|
|
#include "mode.h"
|
|
|
|
|
|
|
|
int generic_console_write(int fd, const char *buf, int n, void *unused)
|
|
|
|
{
|
|
|
|
struct termios save, new;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if(isatty(fd)){
|
|
|
|
CATCH_EINTR(err = tcgetattr(fd, &save));
|
|
|
|
if (err)
|
|
|
|
goto error;
|
|
|
|
new = save;
|
|
|
|
/* The terminal becomes a bit less raw, to handle \n also as
|
|
|
|
* "Carriage Return", not only as "New Line". Otherwise, the new
|
|
|
|
* line won't start at the first column.*/
|
|
|
|
new.c_oflag |= OPOST;
|
|
|
|
CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &new));
|
|
|
|
if (err)
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
err = generic_write(fd, buf, n, NULL);
|
|
|
|
/* Restore raw mode, in any case; we *must* ignore any error apart
|
|
|
|
* EINTR, except for debug.*/
|
|
|
|
if(isatty(fd))
|
|
|
|
CATCH_EINTR(tcsetattr(fd, TCSAFLUSH, &save));
|
|
|
|
return(err);
|
|
|
|
error:
|
|
|
|
return(-errno);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* UML SIGWINCH handling
|
|
|
|
*
|
|
|
|
* The point of this is to handle SIGWINCH on consoles which have host ttys and
|
|
|
|
* relay them inside UML to whatever might be running on the console and cares
|
|
|
|
* about the window size (since SIGWINCH notifies about terminal size changes).
|
|
|
|
*
|
|
|
|
* So, we have a separate thread for each host tty attached to a UML device
|
|
|
|
* (side-issue - I'm annoyed that one thread can't have multiple controlling
|
|
|
|
* ttys for purposed of handling SIGWINCH, but I imagine there are other reasons
|
|
|
|
* that doesn't make any sense).
|
|
|
|
*
|
|
|
|
* SIGWINCH can't be received synchronously, so you have to set up to receive it
|
|
|
|
* as a signal. That being the case, if you are going to wait for it, it is
|
|
|
|
* convenient to sit in a pause() and wait for the signal to bounce you out of
|
|
|
|
* it (see below for how we make sure to exit only on SIGWINCH).
|
|
|
|
*/
|
|
|
|
|
|
|
|
static void winch_handler(int sig)
|
|
|
|
{
|
|
|
|
}
|
|
|
|
|
|
|
|
struct winch_data {
|
|
|
|
int pty_fd;
|
|
|
|
int pipe_fd;
|
|
|
|
int close_me;
|
|
|
|
};
|
|
|
|
|
|
|
|
static int winch_thread(void *arg)
|
|
|
|
{
|
|
|
|
struct winch_data *data = arg;
|
|
|
|
sigset_t sigs;
|
|
|
|
int pty_fd, pipe_fd;
|
|
|
|
int count, err;
|
|
|
|
char c = 1;
|
|
|
|
|
|
|
|
os_close_file(data->close_me);
|
|
|
|
pty_fd = data->pty_fd;
|
|
|
|
pipe_fd = data->pipe_fd;
|
|
|
|
count = os_write_file(pipe_fd, &c, sizeof(c));
|
|
|
|
if(count != sizeof(c))
|
|
|
|
printk("winch_thread : failed to write synchronization "
|
|
|
|
"byte, err = %d\n", -count);
|
|
|
|
|
|
|
|
/* We are not using SIG_IGN on purpose, so don't fix it as I thought to
|
|
|
|
* do! If using SIG_IGN, the pause() call below would not stop on
|
|
|
|
* SIGWINCH. */
|
|
|
|
|
|
|
|
signal(SIGWINCH, winch_handler);
|
|
|
|
sigfillset(&sigs);
|
|
|
|
sigdelset(&sigs, SIGWINCH);
|
|
|
|
/* Block anything else than SIGWINCH. */
|
|
|
|
if(sigprocmask(SIG_SETMASK, &sigs, NULL) < 0){
|
|
|
|
printk("winch_thread : sigprocmask failed, errno = %d\n",
|
|
|
|
errno);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
if(setsid() < 0){
|
|
|
|
printk("winch_thread : setsid failed, errno = %d\n", errno);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
err = os_new_tty_pgrp(pty_fd, os_getpid());
|
|
|
|
if(err < 0){
|
|
|
|
printk("winch_thread : new_tty_pgrp failed, err = %d\n", -err);
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* These are synchronization calls between various UML threads on the
|
|
|
|
* host - since they are not different kernel threads, we cannot use
|
|
|
|
* kernel semaphores. We don't use SysV semaphores because they are
|
|
|
|
* persistant. */
|
|
|
|
count = os_read_file(pipe_fd, &c, sizeof(c));
|
|
|
|
if(count != sizeof(c))
|
|
|
|
printk("winch_thread : failed to read synchronization byte, "
|
|
|
|
"err = %d\n", -count);
|
|
|
|
|
|
|
|
while(1){
|
|
|
|
/* This will be interrupted by SIGWINCH only, since other signals
|
|
|
|
* are blocked.*/
|
|
|
|
pause();
|
|
|
|
|
|
|
|
count = os_write_file(pipe_fd, &c, sizeof(c));
|
|
|
|
if(count != sizeof(c))
|
|
|
|
printk("winch_thread : write failed, err = %d\n",
|
|
|
|
-count);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
|
|
|
|
{
|
|
|
|
struct winch_data data;
|
|
|
|
unsigned long stack;
|
|
|
|
int fds[2], pid, n, err;
|
|
|
|
char c;
|
|
|
|
|
|
|
|
err = os_pipe(fds, 1, 1);
|
|
|
|
if(err < 0){
|
|
|
|
printk("winch_tramp : os_pipe failed, err = %d\n", -err);
|
|
|
|
return(err);
|
|
|
|
}
|
|
|
|
|
|
|
|
data = ((struct winch_data) { .pty_fd = fd,
|
|
|
|
.pipe_fd = fds[1],
|
|
|
|
.close_me = fds[0] } );
|
|
|
|
pid = run_helper_thread(winch_thread, &data, 0, &stack, 0);
|
|
|
|
if(pid < 0){
|
|
|
|
printk("fork of winch_thread failed - errno = %d\n", errno);
|
|
|
|
return(pid);
|
|
|
|
}
|
|
|
|
|
|
|
|
os_close_file(fds[1]);
|
|
|
|
*fd_out = fds[0];
|
|
|
|
n = os_read_file(fds[0], &c, sizeof(c));
|
|
|
|
if(n != sizeof(c)){
|
|
|
|
printk("winch_tramp : failed to read synchronization byte\n");
|
|
|
|
printk("read failed, err = %d\n", -n);
|
|
|
|
printk("fd %d will not support SIGWINCH\n", fd);
|
2005-06-09 06:48:01 +08:00
|
|
|
pid = -1;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
return(pid);
|
|
|
|
}
|
|
|
|
|
|
|
|
void register_winch(int fd, struct tty_struct *tty)
|
|
|
|
{
|
|
|
|
int pid, thread, thread_fd;
|
|
|
|
int count;
|
|
|
|
char c = 1;
|
|
|
|
|
|
|
|
if(!isatty(fd))
|
|
|
|
return;
|
|
|
|
|
|
|
|
pid = tcgetpgrp(fd);
|
|
|
|
if(!CHOOSE_MODE_PROC(is_tracer_winch, is_skas_winch, pid, fd,
|
|
|
|
tty) && (pid == -1)){
|
|
|
|
thread = winch_tramp(fd, tty, &thread_fd);
|
2005-06-09 06:48:01 +08:00
|
|
|
if(thread > 0){
|
2005-04-17 06:20:36 +08:00
|
|
|
register_winch_irq(thread_fd, fd, thread, tty);
|
|
|
|
|
|
|
|
count = os_write_file(thread_fd, &c, sizeof(c));
|
|
|
|
if(count != sizeof(c))
|
|
|
|
printk("register_winch : failed to write "
|
|
|
|
"synchronization byte, err = %d\n",
|
|
|
|
-count);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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:
|
|
|
|
*/
|