linux/arch/um/drivers/xterm.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

225 lines
4.9 KiB
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 = 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,
"/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,
};