Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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 | /* Not static because it's called directly by the tt mode gdb code */ |
| 35 | void *xterm_init(char *str, int device, struct chan_opts *opts) |
| 36 | { |
| 37 | struct xterm_chan *data; |
| 38 | |
| 39 | data = malloc(sizeof(*data)); |
| 40 | if(data == NULL) return(NULL); |
| 41 | *data = ((struct xterm_chan) { .pid = -1, |
| 42 | .helper_pid = -1, |
| 43 | .device = device, |
| 44 | .title = opts->xterm_title, |
| 45 | .raw = opts->raw, |
| 46 | .stack = opts->tramp_stack, |
| 47 | .direct_rcv = !opts->in_kernel } ); |
| 48 | return(data); |
| 49 | } |
| 50 | |
| 51 | /* Only changed by xterm_setup, which is a setup */ |
| 52 | static char *terminal_emulator = "xterm"; |
| 53 | static char *title_switch = "-T"; |
| 54 | static char *exec_switch = "-e"; |
| 55 | |
| 56 | static int __init xterm_setup(char *line, int *add) |
| 57 | { |
| 58 | *add = 0; |
| 59 | terminal_emulator = line; |
| 60 | |
| 61 | line = strchr(line, ','); |
| 62 | if(line == NULL) return(0); |
| 63 | *line++ = '\0'; |
| 64 | if(*line) title_switch = line; |
| 65 | |
| 66 | line = strchr(line, ','); |
| 67 | if(line == NULL) return(0); |
| 68 | *line++ = '\0'; |
| 69 | if(*line) exec_switch = line; |
| 70 | |
| 71 | return(0); |
| 72 | } |
| 73 | |
| 74 | __uml_setup("xterm=", xterm_setup, |
| 75 | "xterm=<terminal emulator>,<title switch>,<exec switch>\n" |
| 76 | " Specifies an alternate terminal emulator to use for the debugger,\n" |
| 77 | " consoles, and serial lines when they are attached to the xterm channel.\n" |
| 78 | " The values are the terminal emulator binary, the switch it uses to set\n" |
| 79 | " its title, and the switch it uses to execute a subprocess,\n" |
| 80 | " respectively. The title switch must have the form '<switch> title',\n" |
| 81 | " not '<switch>=title'. Similarly, the exec switch must have the form\n" |
| 82 | " '<switch> command arg1 arg2 ...'.\n" |
| 83 | " The default values are 'xterm=xterm,-T,-e'. Values for gnome-terminal\n" |
| 84 | " are 'xterm=gnome-terminal,-t,-x'.\n\n" |
| 85 | ); |
| 86 | |
| 87 | /* XXX This badly needs some cleaning up in the error paths |
| 88 | * Not static because it's called directly by the tt mode gdb code |
| 89 | */ |
| 90 | int xterm_open(int input, int output, int primary, void *d, |
| 91 | char **dev_out) |
| 92 | { |
| 93 | struct xterm_chan *data = d; |
| 94 | unsigned long stack; |
| 95 | int pid, fd, new, err; |
| 96 | char title[256], file[] = "/tmp/xterm-pipeXXXXXX"; |
| 97 | char *argv[] = { terminal_emulator, title_switch, title, exec_switch, |
| 98 | "/usr/lib/uml/port-helper", "-uml-socket", |
| 99 | file, NULL }; |
| 100 | |
| 101 | if(os_access(argv[4], OS_ACC_X_OK) < 0) |
| 102 | argv[4] = "port-helper"; |
| 103 | |
| 104 | /* Check that DISPLAY is set, this doesn't guarantee the xterm |
| 105 | * will work but w/o it we can be pretty sure it won't. */ |
| 106 | if (!getenv("DISPLAY")) { |
| 107 | printk("xterm_open: $DISPLAY not set.\n"); |
| 108 | return -ENODEV; |
| 109 | } |
| 110 | |
| 111 | fd = mkstemp(file); |
| 112 | if(fd < 0){ |
| 113 | printk("xterm_open : mkstemp failed, errno = %d\n", errno); |
| 114 | return(-errno); |
| 115 | } |
| 116 | |
| 117 | if(unlink(file)){ |
| 118 | printk("xterm_open : unlink failed, errno = %d\n", errno); |
| 119 | return(-errno); |
| 120 | } |
| 121 | os_close_file(fd); |
| 122 | |
| 123 | fd = os_create_unix_socket(file, sizeof(file), 1); |
| 124 | if(fd < 0){ |
| 125 | printk("xterm_open : create_unix_socket failed, errno = %d\n", |
| 126 | -fd); |
| 127 | return(fd); |
| 128 | } |
| 129 | |
| 130 | sprintf(title, data->title, data->device); |
| 131 | stack = data->stack; |
| 132 | pid = run_helper(NULL, NULL, argv, &stack); |
| 133 | if(pid < 0){ |
| 134 | printk("xterm_open : run_helper failed, errno = %d\n", -pid); |
| 135 | return(pid); |
| 136 | } |
| 137 | |
| 138 | if(data->stack == 0) free_stack(stack, 0); |
| 139 | |
| 140 | if (data->direct_rcv) { |
| 141 | new = os_rcv_fd(fd, &data->helper_pid); |
| 142 | } else { |
| 143 | err = os_set_fd_block(fd, 0); |
| 144 | if(err < 0){ |
| 145 | printk("xterm_open : failed to set descriptor " |
| 146 | "non-blocking, err = %d\n", -err); |
| 147 | return(err); |
| 148 | } |
| 149 | new = xterm_fd(fd, &data->helper_pid); |
| 150 | } |
| 151 | if(new < 0){ |
| 152 | printk("xterm_open : os_rcv_fd failed, err = %d\n", -new); |
| 153 | goto out; |
| 154 | } |
| 155 | |
| 156 | CATCH_EINTR(err = tcgetattr(new, &data->tt)); |
| 157 | if(err){ |
| 158 | new = err; |
| 159 | goto out; |
| 160 | } |
| 161 | |
| 162 | if(data->raw){ |
| 163 | err = raw(new); |
| 164 | if(err){ |
| 165 | new = err; |
| 166 | goto out; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | data->pid = pid; |
| 171 | *dev_out = NULL; |
| 172 | out: |
| 173 | unlink(file); |
| 174 | return(new); |
| 175 | } |
| 176 | |
| 177 | /* Not static because it's called directly by the tt mode gdb code */ |
| 178 | void xterm_close(int fd, void *d) |
| 179 | { |
| 180 | struct xterm_chan *data = d; |
| 181 | |
| 182 | if(data->pid != -1) |
| 183 | os_kill_process(data->pid, 1); |
| 184 | data->pid = -1; |
| 185 | if(data->helper_pid != -1) |
| 186 | os_kill_process(data->helper_pid, 0); |
| 187 | data->helper_pid = -1; |
| 188 | os_close_file(fd); |
| 189 | } |
| 190 | |
| 191 | static void xterm_free(void *d) |
| 192 | { |
| 193 | free(d); |
| 194 | } |
| 195 | |
| 196 | static int xterm_console_write(int fd, const char *buf, int n, void *d) |
| 197 | { |
| 198 | struct xterm_chan *data = d; |
| 199 | |
| 200 | return(generic_console_write(fd, buf, n, &data->tt)); |
| 201 | } |
| 202 | |
| 203 | struct chan_ops xterm_ops = { |
| 204 | .type = "xterm", |
| 205 | .init = xterm_init, |
| 206 | .open = xterm_open, |
| 207 | .close = xterm_close, |
| 208 | .read = generic_read, |
| 209 | .write = generic_write, |
| 210 | .console_write = xterm_console_write, |
| 211 | .window_size = generic_window_size, |
| 212 | .free = xterm_free, |
| 213 | .winch = 1, |
| 214 | }; |
| 215 | |
| 216 | /* |
| 217 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 218 | * Emacs will notice this stuff at the end of the file and automatically |
| 219 | * adjust the settings for this buffer only. This must remain at the end |
| 220 | * of the file. |
| 221 | * --------------------------------------------------------------------------- |
| 222 | * Local variables: |
| 223 | * c-file-style: "linux" |
| 224 | * End: |
| 225 | */ |