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