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xterm.c

/*
 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
 * Licensed under the GPL
 */

#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <termios.h>
#include "chan_user.h"
#include "kern_constants.h"
#include "os.h"
#include "um_malloc.h"
#include "user.h"
#include "xterm.h"

struct xterm_chan {
      int pid;
      int helper_pid;
      char *title;
      int device;
      int raw;
      struct termios tt;
};

static void *xterm_init(char *str, int device, const struct chan_opts *opts)
{
      struct xterm_chan *data;

      data = kmalloc(sizeof(*data), UM_GFP_KERNEL);
      if (data == NULL)
            return NULL;
      *data = ((struct xterm_chan) { .pid             = -1,
                               .helper_pid      = -1,
                               .device          = device,
                               .title           = opts->xterm_title,
                               .raw             = opts->raw } );
      return data;
}

/* Only changed by xterm_setup, which is a setup */
static char *terminal_emulator = "xterm";
static char *title_switch = "-T";
static char *exec_switch = "-e";

static int __init xterm_setup(char *line, int *add)
{
      *add = 0;
      terminal_emulator = line;

      line = strchr(line, ',');
      if (line == NULL)
            return 0;

      *line++ = '\0';
      if (*line)
            title_switch = line;

      line = strchr(line, ',');
      if (line == NULL)
            return 0;

      *line++ = '\0';
      if (*line)
            exec_switch = line;

      return 0;
}

__uml_setup("xterm=", xterm_setup,
"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
"    Specifies an alternate terminal emulator to use for the debugger,\n"
"    consoles, and serial lines when they are attached to the xterm channel.\n"
"    The values are the terminal emulator binary, the switch it uses to set\n"
"    its title, and the switch it uses to execute a subprocess,\n"
"    respectively.  The title switch must have the form '<switch> title',\n"
"    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
"    '<switch> command arg1 arg2 ...'.\n"
"    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
"    are 'xterm=gnome-terminal,-t,-x'.\n\n"
);

static int xterm_open(int input, int output, int primary, void *d,
                  char **dev_out)
{
      struct xterm_chan *data = d;
      int pid, fd, new, err;
      char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
      char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
                   "/usr/lib/uml/port-helper", "-uml-socket",
                   file, NULL };

      if (access(argv[4], X_OK) < 0)
            argv[4] = "port-helper";

      /*
       * Check that DISPLAY is set, this doesn't guarantee the xterm
       * will work but w/o it we can be pretty sure it won't.
       */
      if (getenv("DISPLAY") == NULL) {
            printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
            return -ENODEV;
      }

      /*
       * This business of getting a descriptor to a temp file,
       * deleting the file and closing the descriptor is just to get
       * a known-unused name for the Unix socket that we really
       * want.
       */
      fd = mkstemp(file);
      if (fd < 0) {
            err = -errno;
            printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
                   errno);
            return err;
      }

      if (unlink(file)) {
            err = -errno;
            printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
                   errno);
            return err;
      }
      close(fd);

      fd = os_create_unix_socket(file, sizeof(file), 1);
      if (fd < 0) {
            printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
                   "errno = %d\n", -fd);
            return fd;
      }

      sprintf(title, data->title, data->device);
      pid = run_helper(NULL, NULL, argv);
      if (pid < 0) {
            err = pid;
            printk(UM_KERN_ERR "xterm_open : run_helper failed, "
                   "errno = %d\n", -err);
            goto out_close1;
      }

      err = os_set_fd_block(fd, 0);
      if (err < 0) {
            printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
                   "non-blocking, err = %d\n", -err);
            goto out_kill;
      }

      new = xterm_fd(fd, &data->helper_pid);
      if (new < 0) {
            err = new;
            printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
                   -err);
            goto out_kill;
      }

      err = os_set_fd_block(new, 0);
      if (err) {
            printk(UM_KERN_ERR "xterm_open : failed to set xterm "
                   "descriptor non-blocking, err = %d\n", -err);
            goto out_close2;
      }

      CATCH_EINTR(err = tcgetattr(new, &data->tt));
      if (err) {
            new = err;
            goto out_close2;
      }

      if (data->raw) {
            err = raw(new);
            if (err) {
                  new = err;
                  goto out_close2;
            }
      }

      unlink(file);
      data->pid = pid;
      *dev_out = NULL;

      return new;

 out_close2:
      close(new);
 out_kill:
      os_kill_process(pid, 1);
 out_close1:
      close(fd);

      return err;
}

static void xterm_close(int fd, void *d)
{
      struct xterm_chan *data = d;

      if (data->pid != -1)
            os_kill_process(data->pid, 1);
      data->pid = -1;

      if (data->helper_pid != -1)
            os_kill_process(data->helper_pid, 0);
      data->helper_pid = -1;

      os_close_file(fd);
}

const struct chan_ops xterm_ops = {
      .type       = "xterm",
      .init       = xterm_init,
      .open       = xterm_open,
      .close            = xterm_close,
      .read       = generic_read,
      .write            = generic_write,
      .console_write    = generic_console_write,
      .window_size      = generic_window_size,
      .free       = generic_free,
      .winch            = 1,
};

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