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 "kern_constants.h" 15 #include "os.h" 16 #include "um_malloc.h" 17 #include "user.h" 18 #include "xterm.h" 19 20 struct xterm_chan { 21 int pid; 22 int helper_pid; 23 char *title; 24 int device; 25 int raw; 26 struct termios tt; 27 }; 28 29 static void *xterm_init(char *str, int device, const struct chan_opts *opts) 30 { 31 struct xterm_chan *data; 32 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; 42 } 43 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"; 48 49 static int __init xterm_setup(char *line, int *add) 50 { 51 *add = 0; 52 terminal_emulator = line; 53 54 line = strchr(line, ','); 55 if (line == NULL) 56 return 0; 57 58 *line++ = '\0'; 59 if (*line) 60 title_switch = line; 61 62 line = strchr(line, ','); 63 if (line == NULL) 64 return 0; 65 66 *line++ = '\0'; 67 if (*line) 68 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 static int xterm_open(int input, int output, int primary, void *d, 87 char **dev_out) 88 { 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 "/usr/lib/uml/port-helper", "-uml-socket", 94 file, NULL }; 95 96 if (access(argv[4], X_OK) < 0) 97 argv[4] = "port-helper"; 98 99 /* 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. 102 */ 103 if (getenv("DISPLAY") == NULL) { 104 printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n"); 105 return -ENODEV; 106 } 107 108 /* 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. 113 */ 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; 120 } 121 122 if (unlink(file)) { 123 err = -errno; 124 printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n", 125 errno); 126 return err; 127 } 128 close(fd); 129 130 fd = os_create_unix_socket(file, sizeof(file), 1); 131 if (fd < 0) { 132 printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, " 133 "errno = %d\n", -fd); 134 return fd; 135 } 136 137 sprintf(title, data->title, data->device); 138 pid = run_helper(NULL, NULL, argv); 139 if (pid < 0) { 140 err = pid; 141 printk(UM_KERN_ERR "xterm_open : run_helper failed, " 142 "errno = %d\n", -err); 143 goto out_close1; 144 } 145 146 err = os_set_fd_block(fd, 0); 147 if (err < 0) { 148 printk(UM_KERN_ERR "xterm_open : failed to set descriptor " 149 "non-blocking, err = %d\n", -err); 150 goto out_kill; 151 } 152 153 new = xterm_fd(fd, &data->helper_pid); 154 if (new < 0) { 155 err = new; 156 printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n", 157 -err); 158 goto out_kill; 159 } 160 161 err = os_set_fd_block(new, 0); 162 if (err) { 163 printk(UM_KERN_ERR "xterm_open : failed to set xterm " 164 "descriptor non-blocking, err = %d\n", -err); 165 goto out_close2; 166 } 167 168 CATCH_EINTR(err = tcgetattr(new, &data->tt)); 169 if (err) { 170 new = err; 171 goto out_close2; 172 } 173 174 if (data->raw) { 175 err = raw(new); 176 if (err) { 177 new = err; 178 goto out_close2; 179 } 180 } 181 182 unlink(file); 183 data->pid = pid; 184 *dev_out = NULL; 185 186 return new; 187 188 out_close2: 189 close(new); 190 out_kill: 191 os_kill_process(pid, 1); 192 out_close1: 193 close(fd); 194 195 return err; 196 } 197 198 static void xterm_close(int fd, void *d) 199 { 200 struct xterm_chan *data = d; 201 202 if (data->pid != -1) 203 os_kill_process(data->pid, 1); 204 data->pid = -1; 205 206 if (data->helper_pid != -1) 207 os_kill_process(data->helper_pid, 0); 208 data->helper_pid = -1; 209 210 os_close_file(fd); 211 } 212 213 const struct chan_ops xterm_ops = { 214 .type = "xterm", 215 .init = xterm_init, 216 .open = xterm_open, 217 .close = xterm_close, 218 .read = generic_read, 219 .write = generic_write, 220 .console_write = generic_console_write, 221 .window_size = generic_window_size, 222 .free = generic_free, 223 .winch = 1, 224 }; 225