arch/um/drivers/xterm.c

   1 /*
   2  * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <termios.h>
  12 #include <signal.h>
  13 #include <sched.h>
  14 #include <sys/socket.h>
  15 #include "kern_util.h"
  16 #include "chan_user.h"
  17 #include "user_util.h"
  18 #include "user.h"
  19 #include "os.h"
  20 #include "xterm.h"
  21
  22 struct xterm_chan {
  23         int pid;
  24         int helper_pid;
  25         char *title;
  26         int device;
  27         int raw;
  28         struct termios tt;
  29         unsigned long stack;
  30         int direct_rcv;
  31 };
  32
  33 /* Not static because it's called directly by the tt mode gdb code */
  34 void *xterm_init(char *str, int device, const struct chan_opts *opts)
  35 {
  36         struct xterm_chan *data;
  37
  38         data = malloc(sizeof(*data));
  39         if(data == NULL) return(NULL);
  40         *data = ((struct xterm_chan) { .pid             = -1,
  41                                        .helper_pid      = -1,
  42                                        .device          = device,
  43                                        .title           = opts->xterm_title,
  44                                        .raw             = opts->raw,
  45                                        .stack           = opts->tramp_stack,
  46                                        .direct_rcv      = !opts->in_kernel } );
  47         return(data);
  48 }
  49
  50 /* Only changed by xterm_setup, which is a setup */
  51 static char *terminal_emulator = "xterm";
  52 static char *title_switch = "-T";
  53 static char *exec_switch = "-e";
  54
  55 static int __init xterm_setup(char *line, int *add)
  56 {
  57         *add = 0;
  58         terminal_emulator = line;
  59
  60         line = strchr(line, ',');
  61         if(line == NULL) return(0);
  62         *line++ = '\0';
  63         if(*line) title_switch = line;
  64
  65         line = strchr(line, ',');
  66         if(line == NULL) return(0);
  67         *line++ = '\0';
  68         if(*line) exec_switch = line;
  69
  70         return(0);
  71 }
  72
  73 __uml_setup("xterm=", xterm_setup,
  74 "xterm=<terminal emulator>,<title switch>,<exec switch>\n"
  75 "    Specifies an alternate terminal emulator to use for the debugger,\n"
  76 "    consoles, and serial lines when they are attached to the xterm channel.\n"
  77 "    The values are the terminal emulator binary, the switch it uses to set\n"
  78 "    its title, and the switch it uses to execute a subprocess,\n"
  79 "    respectively.  The title switch must have the form '<switch> title',\n"
  80 "    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
  81 "    '<switch> command arg1 arg2 ...'.\n"
  82 "    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
  83 "    are 'xterm=gnome-terminal,-t,-x'.\n\n"
  84 );
  85
  86 /* XXX This badly needs some cleaning up in the error paths
  87  * Not static because it's called directly by the tt mode gdb code
  88  */
  89 int xterm_open(int input, int output, int primary, void *d,
  90                       char **dev_out)
  91 {
  92         struct xterm_chan *data = d;
  93         unsigned long stack;
  94         int pid, fd, new, err;
  95         char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
  96         char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
  97                          "/usr/lib/uml/port-helper", "-uml-socket",
  98                          file, NULL };
  99
 100         if(os_access(argv[4], OS_ACC_X_OK) < 0)
 101                 argv[4] = "port-helper";
 102
 103         /* Check that DISPLAY is set, this doesn't guarantee the xterm
 104          * will work but w/o it we can be pretty sure it won't. */
 105         if (!getenv("DISPLAY")) {
 106                 printk("xterm_open: $DISPLAY not set.\n");
 107                 return -ENODEV;
 108         }
 109
 110         fd = mkstemp(file);
 111         if(fd < 0){
 112                 err = -errno;
 113                 printk("xterm_open : mkstemp failed, errno = %d\n", errno);
 114                 return err;
 115         }
 116
 117         if(unlink(file)){
 118                 err = -errno;
 119                 printk("xterm_open : unlink failed, errno = %d\n", errno);
 120                 return err;
 121         }
 122         os_close_file(fd);
 123
 124         fd = os_create_unix_socket(file, sizeof(file), 1);
 125         if(fd < 0){
 126                 printk("xterm_open : create_unix_socket failed, errno = %d\n",
 127                        -fd);
 128                 return(fd);
 129         }
 130
 131         sprintf(title, data->title, data->device);
 132         stack = data->stack;
 133         pid = run_helper(NULL, NULL, argv, &stack);
 134         if(pid < 0){
 135                 printk("xterm_open : run_helper failed, errno = %d\n", -pid);
 136                 return(pid);
 137         }
 138
 139         if (data->direct_rcv) {
 140                 new = os_rcv_fd(fd, &data->helper_pid);
 141         } else {
 142                 err = os_set_fd_block(fd, 0);
 143                 if(err < 0){
 144                         printk("xterm_open : failed to set descriptor "
 145                                "non-blocking, err = %d\n", -err);
 146                         return(err);
 147                 }
 148                 new = xterm_fd(fd, &data->helper_pid);
 149         }
 150         if(new < 0){
 151                 printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
 152                 goto out;
 153         }
 154
 155         CATCH_EINTR(err = tcgetattr(new, &data->tt));
 156         if(err){
 157                 new = err;
 158                 goto out;
 159         }
 160
 161         if(data->raw){
 162                 err = raw(new);
 163                 if(err){
 164                         new = err;
 165                         goto out;
 166                 }
 167         }
 168
 169         data->pid = pid;
 170         *dev_out = NULL;
 171  out:
 172         unlink(file);
 173         return(new);
 174 }
 175
 176 /* Not static because it's called directly by the tt mode gdb code */
 177 void xterm_close(int fd, void *d)
 178 {
 179         struct xterm_chan *data = d;
 180
 181         if(data->pid != -1)
 182                 os_kill_process(data->pid, 1);
 183         data->pid = -1;
 184         if(data->helper_pid != -1)
 185                 os_kill_process(data->helper_pid, 0);
 186         data->helper_pid = -1;
 187         os_close_file(fd);
 188 }
 189
 190 static void xterm_free(void *d)
 191 {
 192         free(d);
 193 }
 194
 195 const struct chan_ops xterm_ops = {
 196         .type           = "xterm",
 197         .init           = xterm_init,
 198         .open           = xterm_open,
 199         .close          = xterm_close,
 200         .read           = generic_read,
 201         .write          = generic_write,
 202         .console_write  = generic_console_write,
 203         .window_size    = generic_window_size,
 204         .free           = xterm_free,
 205         .winch          = 1,
 206 };
 207
 208 /*
 209  * Overrides for Emacs so that we follow Linus's tabbing style.
 210  * Emacs will notice this stuff at the end of the file and automatically
 211  * adjust the settings for this buffer only.  This must remain at the end
 212  * of the file.
 213  * ---------------------------------------------------------------------------
 214  * Local variables:
 215  * c-file-style: "linux"
 216  * End:
 217  */