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
  48
  49 /* Set the callback copy of errno from what we see now. */
  50 static int
  51 wrap (p, val)
  52      host_callback *p;
  53      int val;
  54 {
  55   p->last_errno = errno;
  56   return val;
  57 }
  58
  59 /* Make sure the FD provided is ok.  If not, return non-zero
  60    and set errno. */
  61
  62 static int
  63 fdbad (p, fd)
  64      host_callback *p;
  65      int fd;
  66 {
  67   if (fd < 0 || fd > MAX_CALLBACK_FDS || !p->fdopen[fd])
  68     {
  69       p->last_errno = EINVAL;
  70       return -1;
  71     }
  72   return 0;
  73 }
  74
  75 static int
  76 fdmap (p, fd)
  77      host_callback *p;
  78      int fd;
  79 {
  80   return p->fdmap[fd];
  81 }
  82
  83 int
  84 os_close (p, fd)
  85      host_callback *p;
  86      int fd;
  87 {
  88   int result;
  89
  90   result = fdbad (p, fd);
  91   if (result)
  92     return result;
  93   result = wrap (p, close (fdmap (p, fd)));
  94   return result;
  95 }
  96
  97 int
  98 os_get_errno (p)
  99      host_callback *p;
 100 {
 101   /* !!! fixme, translate from host to taget errno value */
 102   return p->last_errno;
 103 }
 104
 105
 106 int
 107 os_isatty (p, fd)
 108      host_callback *p;
 109      int fd;
 110 {
 111   int result;
 112
 113   result = fdbad (p, fd);
 114   if (result)
 115     return result;
 116   result = wrap (p, isatty (fdmap (fd)));
 117   return result;
 118 }
 119
 120 int
 121 os_lseek (p, fd, off, way)
 122      host_callback *p;
 123      int fd;
 124      long off;
 125      int way;
 126 {
 127   int result;
 128
 129   result = fdbad (p, fd);
 130   if (result)
 131     return result;
 132   result = lseek (fdmap (p, fd), off, way);
 133   return result;
 134 }
 135
 136 int
 137 os_open (p, name, flags)
 138      host_callback *p;
 139      const char *name;
 140      int flags;
 141 {
 142   int i;
 143   for (i = 0; i < MAX_CALLBACK_FDS; i++)
 144     {
 145       if (!p->fdopen[i])
 146         {
 147           int f = open (name, flags);
 148           if (f < 0)
 149             {
 150               p->last_errno = errno;
 151               return f;
 152             }
 153           p->fdopen[i] = 1;
 154           p->fdmap[i] = f;
 155           return i;
 156         }
 157     }
 158   p->last_errno = EMFILE;
 159   return -1;
 160 }
 161
 162 int
 163 os_read (p, fd, buf, len)
 164      host_callback *p;
 165      int fd;
 166      char *buf;
 167      int len;
 168 {
 169   int result;
 170
 171   result = fdbad (p, fd);
 172   if (result)
 173     return result;
 174   result = wrap (p, read (fdmap (p, fd), buf, len));
 175   return result;
 176 }
 177
 178 int
 179 os_read_stdin (p, buf, len)
 180      host_callback *p;
 181      char *buf;
 182      int len;
 183 {
 184   return wrap (p, read (0, buf, len));
 185 }
 186
 187 int
 188 os_write (p, fd, buf, len)
 189      host_callback *p;
 190      int fd;
 191      const char *buf;
 192      int len;
 193 {
 194   int result;
 195
 196   result = fdbad (p, fd);
 197   if (result)
 198     return result;
 199   result = wrap (p, write (fdmap (p, fd), buf, len));
 200   return result;
 201 }
 202
 203 /* ignore the grossness of INSIDE_SIMULATOR, it will go away one day. */
 204 int
 205 os_write_stdout (p, buf, len)
 206      host_callback *p;
 207      const char *buf;
 208      int len;
 209 {
 210 #ifdef INSIDE_SIMULATOR
 211   return os_write (p, 1, buf, len);
 212 #else
 213   int i;
 214   char b[2];
 215   for (i = 0; i< len; i++)
 216     {
 217       b[0] = buf[i];
 218       b[1] = 0;
 219       if (target_output_hook)
 220         target_output_hook (b);
 221       else
 222         fputs_filtered (b, gdb_stdout);
 223     }
 224   return len;
 225 #endif
 226 }
 227
 228 int
 229 os_rename (p, f1, f2)
 230      host_callback *p;
 231      const char *f1;
 232      const char *f2;
 233 {
 234   return wrap (p, rename (f1, f2));
 235 }
 236
 237
 238 int
 239 os_system (p, s)
 240      host_callback *p;
 241      const char *s;
 242 {
 243   return wrap (p, system (s));
 244 }
 245
 246 long
 247 os_time (p, t)
 248      host_callback *p;
 249      long *t;
 250 {
 251   return wrap (p, time (t));
 252 }
 253
 254
 255 int
 256 os_unlink (p, f1)
 257      host_callback *p;
 258      const char *f1;
 259 {
 260   return wrap (p, unlink (f1));
 261 }
 262
 263
 264 int
 265 os_shutdown (p)
 266 host_callback *p;
 267 {
 268   int i;
 269   for (i = 0; i < MAX_CALLBACK_FDS; i++)
 270     {
 271       if (p->fdopen[i] && !p->alwaysopen[i]) {
 272         close (p->fdmap[i]);
 273         p->fdopen[i] = 0;
 274       }
 275     }
 276   return 1;
 277 }
 278
 279 int os_init(p)
 280 host_callback *p;
 281 {
 282   int i;
 283   os_shutdown (p);
 284   for (i= 0; i < 3; i++)
 285     {
 286       p->fdmap[i] = i;
 287       p->fdopen[i] = 1;
 288       p->alwaysopen[i] = 1;
 289     }
 290   return 1;
 291 }
 292
 293
 294 /* !!fixme!!
 295    This bit is ugly.  When the interface has settled down I'll
 296    move the whole file into sim/common and remove this bit. */
 297
 298 /* VARARGS */
 299 void
 300 #ifdef ANSI_PROTOTYPES
 301 os_printf_filtered (host_callback *p, const char *format, ...)
 302 #else
 303 os_printf_filtered (p, va_alist)
 304      host_callback *p;
 305      va_dcl
 306 #endif
 307 {
 308   va_list args;
 309 #ifdef ANSI_PROTOTYPES
 310   va_start (args, format);
 311 #else
 312   char *format;
 313
 314   va_start (args);
 315   format = va_arg (args, char *);
 316 #endif
 317
 318 #ifdef INSIDE_SIMULATOR
 319   vprintf (format, args);
 320 #else
 321   vfprintf_filtered (stdout, format, args);
 322 #endif
 323
 324   va_end (args);
 325 }
 326
 327 host_callback default_callback =
 328 {
 329   os_close,
 330   os_get_errno,
 331   os_isatty,
 332   os_lseek,
 333   os_open,
 334   os_read,
 335   os_read_stdin,
 336   os_rename,
 337   os_system,
 338   os_time,
 339   os_unlink,
 340   os_write,
 341   os_write_stdout,
 342
 343   os_shutdown,
 344   os_init,
 345
 346   os_printf_filtered,
 347
 348   0,            /* last errno */
 349 };