Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / um / drivers / xterm.c
blob2e1de57286045ab9cf606250059a4d094b486ab2
1 /*
2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
4 */
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 "kern_constants.h"
15 #include "os.h"
16 #include "um_malloc.h"
17 #include "user.h"
18 #include "xterm.h"
20 struct xterm_chan {
21 int pid;
22 int helper_pid;
23 char *title;
24 int device;
25 int raw;
26 struct termios tt;
29 static void *xterm_init(char *str, int device, const struct chan_opts *opts)
31 struct xterm_chan *data;
33 data = uml_kmalloc(sizeof(*data), UM_GFP_KERNEL);
34 if (data == NULL)
35 return NULL;
36 *data = ((struct xterm_chan) { .pid = -1,
37 .helper_pid = -1,
38 .device = device,
39 .title = opts->xterm_title,
40 .raw = opts->raw } );
41 return data;
44 /* Only changed by xterm_setup, which is a setup */
45 static char *terminal_emulator = "xterm";
46 static char *title_switch = "-T";
47 static char *exec_switch = "-e";
49 static int __init xterm_setup(char *line, int *add)
51 *add = 0;
52 terminal_emulator = line;
54 line = strchr(line, ',');
55 if (line == NULL)
56 return 0;
58 *line++ = '\0';
59 if (*line)
60 title_switch = line;
62 line = strchr(line, ',');
63 if (line == NULL)
64 return 0;
66 *line++ = '\0';
67 if (*line)
68 exec_switch = line;
70 return 0;
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"
86 static int xterm_open(int input, int output, int primary, void *d,
87 char **dev_out)
89 struct xterm_chan *data = d;
90 int pid, fd, new, err;
91 char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
92 char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
93 OS_LIB_PATH "/uml/port-helper", "-uml-socket",
94 file, NULL };
96 if (access(argv[4], X_OK) < 0)
97 argv[4] = "port-helper";
100 * Check that DISPLAY is set, this doesn't guarantee the xterm
101 * will work but w/o it we can be pretty sure it won't.
103 if (getenv("DISPLAY") == NULL) {
104 printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
105 return -ENODEV;
109 * This business of getting a descriptor to a temp file,
110 * deleting the file and closing the descriptor is just to get
111 * a known-unused name for the Unix socket that we really
112 * want.
114 fd = mkstemp(file);
115 if (fd < 0) {
116 err = -errno;
117 printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
118 errno);
119 return err;
122 if (unlink(file)) {
123 err = -errno;
124 printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
125 errno);
126 close(fd);
127 return err;
129 close(fd);
131 fd = os_create_unix_socket(file, sizeof(file), 1);
132 if (fd < 0) {
133 printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
134 "errno = %d\n", -fd);
135 return fd;
138 sprintf(title, data->title, data->device);
139 pid = run_helper(NULL, NULL, argv);
140 if (pid < 0) {
141 err = pid;
142 printk(UM_KERN_ERR "xterm_open : run_helper failed, "
143 "errno = %d\n", -err);
144 goto out_close1;
147 err = os_set_fd_block(fd, 0);
148 if (err < 0) {
149 printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
150 "non-blocking, err = %d\n", -err);
151 goto out_kill;
154 new = xterm_fd(fd, &data->helper_pid);
155 if (new < 0) {
156 err = new;
157 printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
158 -err);
159 goto out_kill;
162 err = os_set_fd_block(new, 0);
163 if (err) {
164 printk(UM_KERN_ERR "xterm_open : failed to set xterm "
165 "descriptor non-blocking, err = %d\n", -err);
166 goto out_close2;
169 CATCH_EINTR(err = tcgetattr(new, &data->tt));
170 if (err) {
171 new = err;
172 goto out_close2;
175 if (data->raw) {
176 err = raw(new);
177 if (err) {
178 new = err;
179 goto out_close2;
183 unlink(file);
184 data->pid = pid;
185 *dev_out = NULL;
187 return new;
189 out_close2:
190 close(new);
191 out_kill:
192 os_kill_process(pid, 1);
193 out_close1:
194 close(fd);
196 return err;
199 static void xterm_close(int fd, void *d)
201 struct xterm_chan *data = d;
203 if (data->pid != -1)
204 os_kill_process(data->pid, 1);
205 data->pid = -1;
207 if (data->helper_pid != -1)
208 os_kill_process(data->helper_pid, 0);
209 data->helper_pid = -1;
211 os_close_file(fd);
214 const struct chan_ops xterm_ops = {
215 .type = "xterm",
216 .init = xterm_init,
217 .open = xterm_open,
218 .close = xterm_close,
219 .read = generic_read,
220 .write = generic_write,
221 .console_write = generic_console_write,
222 .window_size = generic_window_size,
223 .free = generic_free,
224 .winch = 1,