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 void *xterm_init(char *str, int device, 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 int xterm_open(int input, int output, int primary, void *d, char **dev_out)
  88 {
  89         struct xterm_chan *data = d;
  90         unsigned long stack;
  91         int pid, fd, new, err;
  92         char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
  93         char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
  94                          "/usr/lib/uml/port-helper", "-uml-socket",
  95                          file, NULL };
  96
  97         if(os_access(argv[4], OS_ACC_X_OK) < 0)
  98                 argv[4] = "port-helper";
  99
 100         fd = mkstemp(file);
 101         if(fd < 0){
 102                 printk("xterm_open : mkstemp failed, errno = %d\n", errno);
 103                 return(-errno);
 104         }
 105
 106         if(unlink(file)){
 107                 printk("xterm_open : unlink failed, errno = %d\n", errno);
 108                 return(-errno);
 109         }
 110         os_close_file(fd);
 111
 112         fd = os_create_unix_socket(file, sizeof(file), 1);
 113         if(fd < 0){
 114                 printk("xterm_open : create_unix_socket failed, errno = %d\n",
 115                        -fd);
 116                 return(fd);
 117         }
 118
 119         sprintf(title, data->title, data->device);
 120         stack = data->stack;
 121         pid = run_helper(NULL, NULL, argv, &stack);
 122         if(pid < 0){
 123                 printk("xterm_open : run_helper failed, errno = %d\n", -pid);
 124                 return(pid);
 125         }
 126
 127         if(data->stack == 0) free_stack(stack, 0);
 128
 129         if(data->direct_rcv)
 130                 new = os_rcv_fd(fd, &data->helper_pid);
 131         else {
 132                 err = os_set_fd_block(fd, 0);
 133                 if(err < 0){
 134                         printk("xterm_open : failed to set descriptor "
 135                                "non-blocking, err = %d\n", -err);
 136                         return(err);
 137                 }
 138                 new = xterm_fd(fd, &data->helper_pid);
 139         }
 140         if(new < 0){
 141                 printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
 142                 goto out;
 143         }
 144
 145         CATCH_EINTR(err = tcgetattr(new, &data->tt));
 146         if(err){
 147                 new = err;
 148                 goto out;
 149         }
 150
 151         if(data->raw){
 152                 err = raw(new);
 153                 if(err){
 154                         new = err;
 155                         goto out;
 156                 }
 157         }
 158
 159         data->pid = pid;
 160         *dev_out = NULL;
 161  out:
 162         unlink(file);
 163         return(new);
 164 }
 165
 166 void xterm_close(int fd, void *d)
 167 {
 168         struct xterm_chan *data = d;
 169
 170         if(data->pid != -1)
 171                 os_kill_process(data->pid, 1);
 172         data->pid = -1;
 173         if(data->helper_pid != -1)
 174                 os_kill_process(data->helper_pid, 0);
 175         data->helper_pid = -1;
 176         os_close_file(fd);
 177 }
 178
 179 void xterm_free(void *d)
 180 {
 181         free(d);
 182 }
 183
 184 int xterm_console_write(int fd, const char *buf, int n, void *d)
 185 {
 186         struct xterm_chan *data = d;
 187
 188         return(generic_console_write(fd, buf, n, &data->tt));
 189 }
 190
 191 struct chan_ops xterm_ops = {
 192         .type           = "xterm",
 193         .init           = xterm_init,
 194         .open           = xterm_open,
 195         .close          = xterm_close,
 196         .read           = generic_read,
 197         .write          = generic_write,
 198         .console_write  = xterm_console_write,
 199         .window_size    = generic_window_size,
 200         .free           = xterm_free,
 201         .winch          = 1,
 202 };
 203
 204 /*
 205  * Overrides for Emacs so that we follow Linus's tabbing style.
 206  * Emacs will notice this stuff at the end of the file and automatically
 207  * adjust the settings for this buffer only.  This must remain at the end
 208  * of the file.
 209  * ---------------------------------------------------------------------------
 210  * Local variables:
 211  * c-file-style: "linux"
 212  * End:
 213  */