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Linux/arch/um/drivers/xterm.c

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  1 /*
  2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3  * Licensed under the GPL
  4  */
  5 
  6 #include <stddef.h>
  7 #include <stdio.h>
  8 #include <stdlib.h>
  9 #include <unistd.h>
 10 #include <errno.h>
 11 #include <string.h>
 12 #include <termios.h>
 13 #include "chan_user.h"
 14 #include <os.h>
 15 #include <um_malloc.h>
 16 #include "xterm.h"
 17 
 18 struct xterm_chan {
 19         int pid;
 20         int helper_pid;
 21         char *title;
 22         int device;
 23         int raw;
 24         struct termios tt;
 25 };
 26 
 27 static void *xterm_init(char *str, int device, const struct chan_opts *opts)
 28 {
 29         struct xterm_chan *data;
 30 
 31         data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
 32         if (data == NULL)
 33                 return NULL;
 34         *data = ((struct xterm_chan) { .pid             = -1,
 35                                        .helper_pid      = -1,
 36                                        .device          = device,
 37                                        .title           = opts->xterm_title,
 38                                        .raw             = opts->raw } );
 39         return data;
 40 }
 41 
 42 /* Only changed by xterm_setup, which is a setup */
 43 static char *terminal_emulator = "xterm";
 44 static char *title_switch = "-T";
 45 static char *exec_switch = "-e";
 46 
 47 static int __init xterm_setup(char *line, int *add)
 48 {
 49         *add = 0;
 50         terminal_emulator = line;
 51 
 52         line = strchr(line, ',');
 53         if (line == NULL)
 54                 return 0;
 55 
 56         *line++ = '\0';
 57         if (*line)
 58                 title_switch = line;
 59 
 60         line = strchr(line, ',');
 61         if (line == NULL)
 62                 return 0;
 63 
 64         *line++ = '\0';
 65         if (*line)
 66                 exec_switch = line;
 67 
 68         return 0;
 69 }
 70 
 71 __uml_setup("xterm=", xterm_setup,
 72 "xterm=<terminal emulator>,<title switch>,<exec switch>\n"
 73 "    Specifies an alternate terminal emulator to use for the debugger,\n"
 74 "    consoles, and serial lines when they are attached to the xterm channel.\n"
 75 "    The values are the terminal emulator binary, the switch it uses to set\n"
 76 "    its title, and the switch it uses to execute a subprocess,\n"
 77 "    respectively.  The title switch must have the form '<switch> title',\n"
 78 "    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
 79 "    '<switch> command arg1 arg2 ...'.\n"
 80 "    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
 81 "    are 'xterm=gnome-terminal,-t,-x'.\n\n"
 82 );
 83 
 84 static int xterm_open(int input, int output, int primary, void *d,
 85                       char **dev_out)
 86 {
 87         struct xterm_chan *data = d;
 88         int pid, fd, new, err;
 89         char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
 90         char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
 91                          OS_LIB_PATH "/uml/port-helper", "-uml-socket",
 92                          file, NULL };
 93 
 94         if (access(argv[4], X_OK) < 0)
 95                 argv[4] = "port-helper";
 96 
 97         /*
 98          * Check that DISPLAY is set, this doesn't guarantee the xterm
 99          * will work but w/o it we can be pretty sure it won't.
100          */
101         if (getenv("DISPLAY") == NULL) {
102                 printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
103                 return -ENODEV;
104         }
105 
106         /*
107          * This business of getting a descriptor to a temp file,
108          * deleting the file and closing the descriptor is just to get
109          * a known-unused name for the Unix socket that we really
110          * want.
111          */
112         fd = mkstemp(file);
113         if (fd < 0) {
114                 err = -errno;
115                 printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
116                        errno);
117                 return err;
118         }
119 
120         if (unlink(file)) {
121                 err = -errno;
122                 printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
123                        errno);
124                 close(fd);
125                 return err;
126         }
127         close(fd);
128 
129         fd = os_create_unix_socket(file, sizeof(file), 1);
130         if (fd < 0) {
131                 printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
132                        "errno = %d\n", -fd);
133                 return fd;
134         }
135 
136         sprintf(title, data->title, data->device);
137         pid = run_helper(NULL, NULL, argv);
138         if (pid < 0) {
139                 err = pid;
140                 printk(UM_KERN_ERR "xterm_open : run_helper failed, "
141                        "errno = %d\n", -err);
142                 goto out_close1;
143         }
144 
145         err = os_set_fd_block(fd, 0);
146         if (err < 0) {
147                 printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
148                        "non-blocking, err = %d\n", -err);
149                 goto out_kill;
150         }
151 
152         new = xterm_fd(fd, &data->helper_pid);
153         if (new < 0) {
154                 err = new;
155                 printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
156                        -err);
157                 goto out_kill;
158         }
159 
160         err = os_set_fd_block(new, 0);
161         if (err) {
162                 printk(UM_KERN_ERR "xterm_open : failed to set xterm "
163                        "descriptor non-blocking, err = %d\n", -err);
164                 goto out_close2;
165         }
166 
167         CATCH_EINTR(err = tcgetattr(new, &data->tt));
168         if (err) {
169                 new = err;
170                 goto out_close2;
171         }
172 
173         if (data->raw) {
174                 err = raw(new);
175                 if (err) {
176                         new = err;
177                         goto out_close2;
178                 }
179         }
180 
181         unlink(file);
182         data->pid = pid;
183         *dev_out = NULL;
184 
185         return new;
186 
187  out_close2:
188         close(new);
189  out_kill:
190         os_kill_process(pid, 1);
191  out_close1:
192         close(fd);
193 
194         return err;
195 }
196 
197 static void xterm_close(int fd, void *d)
198 {
199         struct xterm_chan *data = d;
200 
201         if (data->pid != -1)
202                 os_kill_process(data->pid, 1);
203         data->pid = -1;
204 
205         if (data->helper_pid != -1)
206                 os_kill_process(data->helper_pid, 0);
207         data->helper_pid = -1;
208 
209         os_close_file(fd);
210 }
211 
212 const struct chan_ops xterm_ops = {
213         .type           = "xterm",
214         .init           = xterm_init,
215         .open           = xterm_open,
216         .close          = xterm_close,
217         .read           = generic_read,
218         .write          = generic_write,
219         .console_write  = generic_console_write,
220         .window_size    = generic_window_size,
221         .free           = generic_free,
222         .winch          = 1,
223 };
224 

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