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