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