gdb/callback.c

   1 /* Host callback routines for GDB.
   2    Copyright 1995 Free Software Foundation, Inc.
   3    Contributed by Cygnus Support.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21
  22 /* This file provides a standard way for targets to talk to the host OS
  23    level.
  24
  25    This interface will probably need a bit more banging to make it
  26    smooth.  Currently the simulator uses this file to provide the
  27    callbacks for itself when it's built standalone, which is rather
  28    ugly. */
  29
  30 #ifndef INSIDE_SIMULATOR
  31 #include "defs.h"
  32 #endif
  33
  34 #include "ansidecl.h"
  35 #include "callback.h"
  36 #ifdef ANSI_PROTOTYPES
  37 #include <stdarg.h>
  38 #else
  39 #include <varargs.h>
  40 #endif
  41
  42 #include <stdio.h>
  43 #include <errno.h>
  44 #include <fcntl.h>
  45 #include <time.h>
  46
  47 static int os_init PARAMS ((host_callback *));
  48 static int os_shutdown PARAMS ((host_callback *));
  49 static int os_unlink PARAMS ((host_callback *, const char *));
  50 static long os_time PARAMS ((host_callback *, long *));
  51 static int os_system PARAMS ((host_callback *, const char *));
  52 static int os_rename PARAMS ((host_callback *, const char *, const char *));
  53 static int os_write_stdout PARAMS ((host_callback *, const char *, int));
  54 static int os_write PARAMS ((host_callback *, int, const char *, int));
  55 static int os_read_stdin PARAMS ((host_callback *, char *, int));
  56 static int os_read PARAMS ((host_callback *, int, char *, int));
  57 static int os_open PARAMS ((host_callback *, const char *, int));
  58 static int os_lseek PARAMS ((host_callback *, int, long, int));
  59 static int os_isatty PARAMS ((host_callback *, int));
  60 static int os_get_errno PARAMS ((host_callback *));
  61 static int os_close PARAMS ((host_callback *, int));
  62 static int fdmap PARAMS ((host_callback *, int));
  63 static int fdbad PARAMS ((host_callback *, int));
  64 static int wrap PARAMS ((host_callback *, int));
  65
  66 /* Set the callback copy of errno from what we see now. */
  67 static int
  68 wrap (p, val)
  69      host_callback *p;
  70      int val;
  71 {
  72   p->last_errno = errno;
  73   return val;
  74 }
  75
  76 /* Make sure the FD provided is ok.  If not, return non-zero
  77    and set errno. */
  78
  79 static int
  80 fdbad (p, fd)
  81      host_callback *p;
  82      int fd;
  83 {
  84   if (fd < 0 || fd > MAX_CALLBACK_FDS || !p->fdopen[fd])
  85     {
  86       p->last_errno = EINVAL;
  87       return -1;
  88     }
  89   return 0;
  90 }
  91
  92 static int
  93 fdmap (p, fd)
  94      host_callback *p;
  95      int fd;
  96 {
  97   return p->fdmap[fd];
  98 }
  99
 100 static int
 101 os_close (p, fd)
 102      host_callback *p;
 103      int fd;
 104 {
 105   int result;
 106
 107   result = fdbad (p, fd);
 108   if (result)
 109     return result;
 110   result = wrap (p, close (fdmap (p, fd)));
 111   return result;
 112 }
 113
 114 static int
 115 os_get_errno (p)
 116      host_callback *p;
 117 {
 118   /* !!! fixme, translate from host to taget errno value */
 119   return p->last_errno;
 120 }
 121
 122
 123 static int
 124 os_isatty (p, fd)
 125      host_callback *p;
 126      int fd;
 127 {
 128   int result;
 129
 130   result = fdbad (p, fd);
 131   if (result)
 132     return result;
 133   result = wrap (p, isatty (fdmap (p, fd)));
 134   return result;
 135 }
 136
 137 static int
 138 os_lseek (p, fd, off, way)
 139      host_callback *p;
 140      int fd;
 141      long off;
 142      int way;
 143 {
 144   int result;
 145
 146   result = fdbad (p, fd);
 147   if (result)
 148     return result;
 149   result = lseek (fdmap (p, fd), off, way);
 150   return result;
 151 }
 152
 153 static int
 154 os_open (p, name, flags)
 155      host_callback *p;
 156      const char *name;
 157      int flags;
 158 {
 159   int i;
 160   for (i = 0; i < MAX_CALLBACK_FDS; i++)
 161     {
 162       if (!p->fdopen[i])
 163         {
 164           int f = open (name, flags);
 165           if (f < 0)
 166             {
 167               p->last_errno = errno;
 168               return f;
 169             }
 170           p->fdopen[i] = 1;
 171           p->fdmap[i] = f;
 172           return i;
 173         }
 174     }
 175   p->last_errno = EMFILE;
 176   return -1;
 177 }
 178
 179 static int
 180 os_read (p, fd, buf, len)
 181      host_callback *p;
 182      int fd;
 183      char *buf;
 184      int len;
 185 {
 186   int result;
 187
 188   result = fdbad (p, fd);
 189   if (result)
 190     return result;
 191   result = wrap (p, read (fdmap (p, fd), buf, len));
 192   return result;
 193 }
 194
 195 static int
 196 os_read_stdin (p, buf, len)
 197      host_callback *p;
 198      char *buf;
 199      int len;
 200 {
 201   return wrap (p, read (0, buf, len));
 202 }
 203
 204 static int
 205 os_write (p, fd, buf, len)
 206      host_callback *p;
 207      int fd;
 208      const char *buf;
 209      int len;
 210 {
 211   int result;
 212
 213   result = fdbad (p, fd);
 214   if (result)
 215     return result;
 216   result = wrap (p, write (fdmap (p, fd), buf, len));
 217   return result;
 218 }
 219
 220 /* ignore the grossness of INSIDE_SIMULATOR, it will go away one day. */
 221
 222 static int
 223 os_write_stdout (p, buf, len)
 224      host_callback *p;
 225      const char *buf;
 226      int len;
 227 {
 228 #ifdef INSIDE_SIMULATOR
 229   return os_write (p, 1, buf, len);
 230 #else
 231   int i;
 232   char b[2];
 233   for (i = 0; i< len; i++)
 234     {
 235       b[0] = buf[i];
 236       b[1] = 0;
 237       if (target_output_hook)
 238         target_output_hook (b);
 239       else
 240         fputs_filtered (b, gdb_stdout);
 241     }
 242   return len;
 243 #endif
 244 }
 245
 246 static int
 247 os_rename (p, f1, f2)
 248      host_callback *p;
 249      const char *f1;
 250      const char *f2;
 251 {
 252   return wrap (p, rename (f1, f2));
 253 }
 254
 255
 256 static int
 257 os_system (p, s)
 258      host_callback *p;
 259      const char *s;
 260 {
 261   return wrap (p, system (s));
 262 }
 263
 264 static long
 265 os_time (p, t)
 266      host_callback *p;
 267      long *t;
 268 {
 269   return wrap (p, time (t));
 270 }
 271
 272
 273 static int
 274 os_unlink (p, f1)
 275      host_callback *p;
 276      const char *f1;
 277 {
 278   return wrap (p, unlink (f1));
 279 }
 280
 281
 282 static int
 283 os_shutdown (p)
 284      host_callback *p;
 285 {
 286   int i;
 287   for (i = 0; i < MAX_CALLBACK_FDS; i++)
 288     {
 289       if (p->fdopen[i] && !p->alwaysopen[i]) {
 290         close (p->fdmap[i]);
 291         p->fdopen[i] = 0;
 292       }
 293     }
 294   return 1;
 295 }
 296
 297 static int
 298 os_init(p)
 299      host_callback *p;
 300 {
 301   int i;
 302   os_shutdown (p);
 303   for (i= 0; i < 3; i++)
 304     {
 305       p->fdmap[i] = i;
 306       p->fdopen[i] = 1;
 307       p->alwaysopen[i] = 1;
 308     }
 309   return 1;
 310 }
 311
 312
 313 /* !!fixme!!
 314    This bit is ugly.  When the interface has settled down I'll
 315    move the whole file into sim/common and remove this bit. */
 316
 317 /* VARARGS */
 318 static void
 319 #ifdef ANSI_PROTOTYPES
 320 os_printf_filtered (host_callback *p, const char *format, ...)
 321 #else
 322 os_printf_filtered (p, va_alist)
 323      host_callback *p;
 324      va_dcl
 325 #endif
 326 {
 327   va_list args;
 328 #ifdef ANSI_PROTOTYPES
 329   va_start (args, format);
 330 #else
 331   char *format;
 332
 333   va_start (args);
 334   format = va_arg (args, char *);
 335 #endif
 336
 337 #ifdef INSIDE_SIMULATOR
 338   vprintf (format, args);
 339 #else
 340   vfprintf_filtered (stdout, format, args);
 341 #endif
 342
 343   va_end (args);
 344 }
 345
 346 host_callback default_callback =
 347 {
 348   os_close,
 349   os_get_errno,
 350   os_isatty,
 351   os_lseek,
 352   os_open,
 353   os_read,
 354   os_read_stdin,
 355   os_rename,
 356   os_system,
 357   os_time,
 358   os_unlink,
 359   os_write,
 360   os_write_stdout,
 361
 362   os_shutdown,
 363   os_init,
 364
 365   os_printf_filtered,
 366
 367   0,            /* last errno */
 368 };