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-rw-r--r--arch/um/drivers/xterm.c229
1 files changed, 229 insertions, 0 deletions
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c
new file mode 100644
index 000000000..6918de5e2
--- /dev/null
+++ b/arch/um/drivers/xterm.c
@@ -0,0 +1,229 @@
+// 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;
+ int chan_fd;
+ 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,
+ .chan_fd = -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 = CONFIG_XTERM_CHAN_DEFAULT_EMULATOR;
+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=" CONFIG_XTERM_CHAN_DEFAULT_EMULATOR
+ ",-T,-e'.\n"
+" Values for gnome-terminal 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;
+ }
+
+ data->chan_fd = fd;
+ 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;
+
+ if (data->chan_fd != -1)
+ os_close_file(data->chan_fd);
+ 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,
+};