| 1 | /* Generic serial interface routines |
| 2 | Copyright 1992, 1993 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "serial.h" |
| 22 | |
| 23 | /* Linked list of serial I/O handlers */ |
| 24 | |
| 25 | static struct serial_ops *serial_ops_list = NULL; |
| 26 | |
| 27 | /* This is the last serial stream opened. Used by connect command. */ |
| 28 | |
| 29 | static serial_t last_serial_opened = NULL; |
| 30 | |
| 31 | static struct serial_ops * |
| 32 | serial_interface_lookup (name) |
| 33 | char *name; |
| 34 | { |
| 35 | struct serial_ops *ops; |
| 36 | |
| 37 | for (ops = serial_ops_list; ops; ops = ops->next) |
| 38 | if (strcmp (name, ops->name) == 0) |
| 39 | return ops; |
| 40 | |
| 41 | return NULL; |
| 42 | } |
| 43 | |
| 44 | void |
| 45 | serial_add_interface(optable) |
| 46 | struct serial_ops *optable; |
| 47 | { |
| 48 | optable->next = serial_ops_list; |
| 49 | serial_ops_list = optable; |
| 50 | } |
| 51 | |
| 52 | /* Open up a device or a network socket, depending upon the syntax of NAME. */ |
| 53 | |
| 54 | serial_t |
| 55 | serial_open (name) |
| 56 | const char *name; |
| 57 | { |
| 58 | serial_t scb; |
| 59 | struct serial_ops *ops; |
| 60 | |
| 61 | for (scb = scb_base; scb; scb = scb->next) |
| 62 | if (scb->name && strcmp (scb->name, name) == 0) |
| 63 | { |
| 64 | scb->refcnt++; |
| 65 | return scb; |
| 66 | } |
| 67 | |
| 68 | if (strcmp (name, "pc") == 0) |
| 69 | ops = serial_interface_lookup ("pc"); |
| 70 | else if (strchr (name, ':')) |
| 71 | ops = serial_interface_lookup ("tcp"); |
| 72 | else |
| 73 | ops = serial_interface_lookup ("hardwire"); |
| 74 | |
| 75 | if (!ops) |
| 76 | return NULL; |
| 77 | |
| 78 | scb = (serial_t)xmalloc (sizeof (struct _serial_t)); |
| 79 | |
| 80 | scb->ops = ops; |
| 81 | |
| 82 | scb->bufcnt = 0; |
| 83 | scb->bufp = scb->buf; |
| 84 | |
| 85 | if (scb->ops->open(scb, name)) |
| 86 | { |
| 87 | free (scb); |
| 88 | return NULL; |
| 89 | } |
| 90 | |
| 91 | scb->name = strsave (name); |
| 92 | scb->next = scb_base; |
| 93 | scb->refcnt = 1; |
| 94 | scb_base = scb; |
| 95 | |
| 96 | last_serial_opened = scb; |
| 97 | |
| 98 | return scb; |
| 99 | } |
| 100 | |
| 101 | serial_t |
| 102 | serial_fdopen (fd) |
| 103 | const int fd; |
| 104 | { |
| 105 | serial_t scb; |
| 106 | struct serial_ops *ops; |
| 107 | |
| 108 | for (scb = scb_base; scb; scb = scb->next) |
| 109 | if (scb->fd == fd) |
| 110 | { |
| 111 | scb->refcnt++; |
| 112 | return scb; |
| 113 | } |
| 114 | |
| 115 | ops = serial_interface_lookup ("hardwire"); |
| 116 | |
| 117 | if (!ops) |
| 118 | return NULL; |
| 119 | |
| 120 | scb = (serial_t)xmalloc (sizeof (struct _serial_t)); |
| 121 | |
| 122 | scb->ops = ops; |
| 123 | |
| 124 | scb->bufcnt = 0; |
| 125 | scb->bufp = scb->buf; |
| 126 | |
| 127 | scb->fd = fd; |
| 128 | |
| 129 | scb->name = NULL; |
| 130 | scb->next = scb_base; |
| 131 | scb->refcnt = 1; |
| 132 | scb_base = scb; |
| 133 | |
| 134 | last_serial_opened = scb; |
| 135 | |
| 136 | return scb; |
| 137 | } |
| 138 | |
| 139 | void |
| 140 | serial_close(scb) |
| 141 | serial_t scb; |
| 142 | { |
| 143 | serial_t tmp_scb; |
| 144 | |
| 145 | last_serial_opened = NULL; |
| 146 | |
| 147 | /* This is bogus. It's not our fault if you pass us a bad scb...! Rob, you |
| 148 | should fix your code instead. */ |
| 149 | |
| 150 | if (!scb) |
| 151 | return; |
| 152 | |
| 153 | scb->refcnt--; |
| 154 | if (scb->refcnt > 0) |
| 155 | return; |
| 156 | |
| 157 | scb->ops->close (scb); |
| 158 | |
| 159 | if (scb->name) |
| 160 | free (scb->name); |
| 161 | |
| 162 | if (scb_base == scb) |
| 163 | scb_base = scb_base->next; |
| 164 | else |
| 165 | for (tmp_scb = scb_base; tmp_scb; tmp_scb = tmp_scb->next) |
| 166 | { |
| 167 | if (tmp_scb->next != scb) |
| 168 | continue; |
| 169 | |
| 170 | tmp_scb->next = tmp_scb->next->next; |
| 171 | break; |
| 172 | } |
| 173 | |
| 174 | free(scb); |
| 175 | } |
| 176 | |
| 177 | #if 0 |
| 178 | /* |
| 179 | The connect command is #if 0 because I hadn't thought of an elegant |
| 180 | way to wait for I/O on two serial_t's simultaneously. Two solutions |
| 181 | came to mind: |
| 182 | |
| 183 | 1) Fork, and have have one fork handle the to user direction, |
| 184 | and have the other hand the to target direction. This |
| 185 | obviously won't cut it for MSDOS. |
| 186 | |
| 187 | 2) Use something like select. This assumes that stdin and |
| 188 | the target side can both be waited on via the same |
| 189 | mechanism. This may not be true for DOS, if GDB is |
| 190 | talking to the target via a TCP socket. |
| 191 | -grossman, 8 Jun 93 |
| 192 | */ |
| 193 | |
| 194 | /* Connect the user directly to the remote system. This command acts just like |
| 195 | the 'cu' or 'tip' command. Use <CR>~. or <CR>~^D to break out. */ |
| 196 | |
| 197 | static serial_t tty_desc; /* Controlling terminal */ |
| 198 | |
| 199 | static void |
| 200 | cleanup_tty(ttystate) |
| 201 | serial_ttystate ttystate; |
| 202 | { |
| 203 | printf_unfiltered ("\r\n[Exiting connect mode]\r\n"); |
| 204 | SERIAL_SET_TTY_STATE (tty_desc, ttystate); |
| 205 | free (ttystate); |
| 206 | SERIAL_CLOSE (tty_desc); |
| 207 | } |
| 208 | |
| 209 | static void |
| 210 | connect_command (args, fromtty) |
| 211 | char *args; |
| 212 | int fromtty; |
| 213 | { |
| 214 | int c; |
| 215 | char cur_esc = 0; |
| 216 | serial_ttystate ttystate; |
| 217 | serial_t port_desc; /* TTY port */ |
| 218 | |
| 219 | dont_repeat(); |
| 220 | |
| 221 | if (args) |
| 222 | fprintf_unfiltered(gdb_stderr, "This command takes no args. They have been ignored.\n"); |
| 223 | |
| 224 | printf_unfiltered("[Entering connect mode. Use ~. or ~^D to escape]\n"); |
| 225 | |
| 226 | tty_desc = SERIAL_FDOPEN (0); |
| 227 | port_desc = last_serial_opened; |
| 228 | |
| 229 | ttystate = SERIAL_GET_TTY_STATE (tty_desc); |
| 230 | |
| 231 | SERIAL_RAW (tty_desc); |
| 232 | SERIAL_RAW (port_desc); |
| 233 | |
| 234 | make_cleanup (cleanup_tty, ttystate); |
| 235 | |
| 236 | while (1) |
| 237 | { |
| 238 | int mask; |
| 239 | |
| 240 | mask = SERIAL_WAIT_2 (tty_desc, port_desc, -1); |
| 241 | |
| 242 | if (mask & 2) |
| 243 | { /* tty input */ |
| 244 | char cx; |
| 245 | |
| 246 | while (1) |
| 247 | { |
| 248 | c = SERIAL_READCHAR(tty_desc, 0); |
| 249 | |
| 250 | if (c == SERIAL_TIMEOUT) |
| 251 | break; |
| 252 | |
| 253 | if (c < 0) |
| 254 | perror_with_name("connect"); |
| 255 | |
| 256 | cx = c; |
| 257 | SERIAL_WRITE(port_desc, &cx, 1); |
| 258 | |
| 259 | switch (cur_esc) |
| 260 | { |
| 261 | case 0: |
| 262 | if (c == '\r') |
| 263 | cur_esc = c; |
| 264 | break; |
| 265 | case '\r': |
| 266 | if (c == '~') |
| 267 | cur_esc = c; |
| 268 | else |
| 269 | cur_esc = 0; |
| 270 | break; |
| 271 | case '~': |
| 272 | if (c == '.' || c == '\004') |
| 273 | return; |
| 274 | else |
| 275 | cur_esc = 0; |
| 276 | } |
| 277 | } |
| 278 | } |
| 279 | |
| 280 | if (mask & 1) |
| 281 | { /* Port input */ |
| 282 | char cx; |
| 283 | |
| 284 | while (1) |
| 285 | { |
| 286 | c = SERIAL_READCHAR(port_desc, 0); |
| 287 | |
| 288 | if (c == SERIAL_TIMEOUT) |
| 289 | break; |
| 290 | |
| 291 | if (c < 0) |
| 292 | perror_with_name("connect"); |
| 293 | |
| 294 | cx = c; |
| 295 | |
| 296 | SERIAL_WRITE(tty_desc, &cx, 1); |
| 297 | } |
| 298 | } |
| 299 | } |
| 300 | } |
| 301 | #endif /* 0 */ |
| 302 | |
| 303 | void |
| 304 | _initialize_serial () |
| 305 | { |
| 306 | #if 0 |
| 307 | add_com ("connect", class_obscure, connect_command, |
| 308 | "Connect the terminal directly up to the command monitor.\n\ |
| 309 | Use <CR>~. or <CR>~^D to break out."); |
| 310 | #endif /* 0 */ |
| 311 | } |