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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*/
#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 <os.h>
#include <um_malloc.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 = uml_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,
OS_LIB_PATH "/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);
close(fd);
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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