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 "helper.h"
  18 #include "user_util.h"
  19 #include "user.h"
  20 #include "os.h"
  21 #include "xterm.h"
  22
  23 struct xterm_chan {
  24         int pid;
  25         int helper_pid;
  26         char *title;
  27         int device;
  28         int raw;
  29         struct termios tt;
  30         unsigned long stack;
  31         int direct_rcv;
  32 };
  33
  34 /* Not static because it's called directly by the tt mode gdb code */
  35 void *xterm_init(char *str, int device, struct chan_opts *opts)
  36 {
  37         struct xterm_chan *data;
  38
  39         data = malloc(sizeof(*data));
  40         if(data == NULL) return(NULL);
  41         *data = ((struct xterm_chan) { .pid             = -1,
  42                                        .helper_pid      = -1,
  43                                        .device          = device,
  44                                        .title           = opts->xterm_title,
  45                                        .raw             = opts->raw,
  46                                        .stack           = opts->tramp_stack,
  47                                        .direct_rcv      = !opts->in_kernel } );
  48         return(data);
  49 }
  50
  51 /* Only changed by xterm_setup, which is a setup */
  52 static char *terminal_emulator = "xterm";
  53 static char *title_switch = "-T";
  54 static char *exec_switch = "-e";
  55
  56 static int __init xterm_setup(char *line, int *add)
  57 {
  58         *add = 0;
  59         terminal_emulator = line;
  60
  61         line = strchr(line, ',');
  62         if(line == NULL) return(0);
  63         *line++ = '\0';
  64         if(*line) title_switch = line;
  65
  66         line = strchr(line, ',');
  67         if(line == NULL) return(0);
  68         *line++ = '\0';
  69         if(*line) exec_switch = line;
  70
  71         return(0);
  72 }
  73
  74 __uml_setup("xterm=", xterm_setup,
  75 "xterm=<terminal emulator>,<title switch>,<exec switch>\n"
  76 "    Specifies an alternate terminal emulator to use for the debugger,\n"
  77 "    consoles, and serial lines when they are attached to the xterm channel.\n"
  78 "    The values are the terminal emulator binary, the switch it uses to set\n"
  79 "    its title, and the switch it uses to execute a subprocess,\n"
  80 "    respectively.  The title switch must have the form '<switch> title',\n"
  81 "    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
  82 "    '<switch> command arg1 arg2 ...'.\n"
  83 "    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
  84 "    are 'xterm=gnome-terminal,-t,-x'.\n\n"
  85 );
  86
  87 /* XXX This badly needs some cleaning up in the error paths
  88  * Not static because it's called directly by the tt mode gdb code
  89  */
  90 int xterm_open(int input, int output, int primary, void *d,
  91                       char **dev_out)
  92 {
  93         struct xterm_chan *data = d;
  94         unsigned long stack;
  95         int pid, fd, new, err;
  96         char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
  97         char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
  98                          "/usr/lib/uml/port-helper", "-uml-socket",
  99                          file, NULL };
 100
 101         if(os_access(argv[4], OS_ACC_X_OK) < 0)
 102                 argv[4] = "port-helper";
 103
 104         /* Check that DISPLAY is set, this doesn't guarantee the xterm
 105          * will work but w/o it we can be pretty sure it won't. */
 106         if (!getenv("DISPLAY")) {
 107                 printk("xterm_open: $DISPLAY not set.\n");
 108                 return -ENODEV;
 109         }
 110
 111         fd = mkstemp(file);
 112         if(fd < 0){
 113                 err = -errno;
 114                 printk("xterm_open : mkstemp failed, errno = %d\n", errno);
 115                 return err;
 116         }
 117
 118         if(unlink(file)){
 119                 err = -errno;
 120                 printk("xterm_open : unlink failed, errno = %d\n", errno);
 121                 return err;
 122         }
 123         os_close_file(fd);
 124
 125         fd = os_create_unix_socket(file, sizeof(file), 1);
 126         if(fd < 0){
 127                 printk("xterm_open : create_unix_socket failed, errno = %d\n",
 128                        -fd);
 129                 return(fd);
 130         }
 131
 132         sprintf(title, data->title, data->device);
 133         stack = data->stack;
 134         pid = run_helper(NULL, NULL, argv, &stack);
 135         if(pid < 0){
 136                 printk("xterm_open : run_helper failed, errno = %d\n", -pid);
 137                 return(pid);
 138         }
 139
 140         if(data->stack == 0) free_stack(stack, 0);
 141
 142         if (data->direct_rcv) {
 143                 new = os_rcv_fd(fd, &data->helper_pid);
 144         } else {
 145                 err = os_set_fd_block(fd, 0);
 146                 if(err < 0){
 147                         printk("xterm_open : failed to set descriptor "
 148                                "non-blocking, err = %d\n", -err);
 149                         return(err);
 150                 }
 151                 new = xterm_fd(fd, &data->helper_pid);
 152         }
 153         if(new < 0){
 154                 printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
 155                 goto out;
 156         }
 157
 158         CATCH_EINTR(err = tcgetattr(new, &data->tt));
 159         if(err){
 160                 new = err;
 161                 goto out;
 162         }
 163
 164         if(data->raw){
 165                 err = raw(new);
 166                 if(err){
 167                         new = err;
 168                         goto out;
 169                 }
 170         }
 171
 172         data->pid = pid;
 173         *dev_out = NULL;
 174  out:
 175         unlink(file);
 176         return(new);
 177 }
 178
 179 /* Not static because it's called directly by the tt mode gdb code */
 180 void xterm_close(int fd, void *d)
 181 {
 182         struct xterm_chan *data = d;
 183
 184         if(data->pid != -1)
 185                 os_kill_process(data->pid, 1);
 186         data->pid = -1;
 187         if(data->helper_pid != -1)
 188                 os_kill_process(data->helper_pid, 0);
 189         data->helper_pid = -1;
 190         os_close_file(fd);
 191 }
 192
 193 static void xterm_free(void *d)
 194 {
 195         free(d);
 196 }
 197
 198 static int xterm_console_write(int fd, const char *buf, int n, void *d)
 199 {
 200         struct xterm_chan *data = d;
 201
 202         return(generic_console_write(fd, buf, n, &data->tt));
 203 }
 204
 205 struct chan_ops xterm_ops = {
 206         .type           = "xterm",
 207         .init           = xterm_init,
 208         .open           = xterm_open,
 209         .close          = xterm_close,
 210         .read           = generic_read,
 211         .write          = generic_write,
 212         .console_write  = xterm_console_write,
 213         .window_size    = generic_window_size,
 214         .free           = xterm_free,
 215         .winch          = 1,
 216 };
 217
 218 /*
 219  * Overrides for Emacs so that we follow Linus's tabbing style.
 220  * Emacs will notice this stuff at the end of the file and automatically
 221  * adjust the settings for this buffer only.  This must remain at the end
 222  * of the file.
 223  * ---------------------------------------------------------------------------
 224  * Local variables:
 225  * c-file-style: "linux"
 226  * End:
 227  */