src/helper/replacements.c

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Dominic Rath                                    *
   3  *   Dominic.Rath@gmx.de                                                   *
   4  *                                                                         *
   5  *   Copyright (C) 2007,2008 Øyvind Harboe                                 *
   6  *   oyvind.harboe@zylin.com                                               *
   7  *                                                                         *
   8  *   Copyright (C) 2008 by Spencer Oliver                                  *
   9  *   spen@spen-soft.co.uk                                                  *
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  *   This program is distributed in the hope that it will be useful,       *
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  19  *   GNU General Public License for more details.                          *
  20  *                                                                         *
  21  *   You should have received a copy of the GNU General Public License     *
  22  *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
  23  ***************************************************************************/
  24 /* DANGER!!!! These must be defined *BEFORE* replacements.h and the malloc() macro!!!! */
  25
  26 #include <stdlib.h>
  27 #include <string.h>
  28 /*
  29  * clear_malloc
  30  *
  31  * will alloc memory and clear it
  32  */
  33 void *clear_malloc(size_t size)
  34 {
  35         void *t = malloc(size);
  36         if (t)
  37                 memset(t, 0x00, size);
  38         return t;
  39 }
  40
  41 void *fill_malloc(size_t size)
  42 {
  43         void *t = malloc(size);
  44         if (t) {
  45                 /* We want to initialize memory to some known bad state.
  46                  * 0 and 0xff yields 0 and -1 as integers, which often
  47                  * have meaningful values. 0x5555... is not often a valid
  48                  * integer and is quite easily spotted in the debugger
  49                  * also it is almost certainly an invalid address */
  50                 memset(t, 0x55, size);
  51         }
  52         return t;
  53 }
  54
  55 #define IN_REPLACEMENTS_C
  56 #ifdef HAVE_CONFIG_H
  57 #include "config.h"
  58 #endif
  59 #ifdef HAVE_STRINGS_H
  60 #include <strings.h>
  61 #endif
  62
  63 #ifdef _WIN32
  64 #include <io.h>
  65 #include <winsock2.h>
  66 #endif
  67
  68 /* replacements for gettimeofday */
  69 #ifndef HAVE_GETTIMEOFDAY
  70
  71 /* Windows */
  72 #ifdef _WIN32
  73
  74 #ifndef __GNUC__
  75 #define EPOCHFILETIME (116444736000000000i64)
  76 #else
  77 #define EPOCHFILETIME (116444736000000000LL)
  78 #endif
  79
  80 int gettimeofday(struct timeval *tv, struct timezone *tz)
  81 {
  82         FILETIME ft;
  83         LARGE_INTEGER li;
  84         __int64 t;
  85         static int tzflag;
  86
  87         if (tv) {
  88                 GetSystemTimeAsFileTime(&ft);
  89                 li.LowPart  = ft.dwLowDateTime;
  90                 li.HighPart = ft.dwHighDateTime;
  91                 t  = li.QuadPart;                                       /* In 100-nanosecond intervals */
  92                 t -= EPOCHFILETIME;                                     /* Offset to the Epoch time */
  93                 t /= 10;                                                        /* In microseconds */
  94                 tv->tv_sec  = (long)(t / 1000000);
  95                 tv->tv_usec = (long)(t % 1000000);
  96         }
  97
  98         if (tz) {
  99                 if (!tzflag) {
 100                         _tzset();
 101                         tzflag++;
 102                 }
 103                 tz->tz_minuteswest = _timezone / 60;
 104                 tz->tz_dsttime = _daylight;
 105         }
 106
 107         return 0;
 108 }
 109 #endif  /* _WIN32 */
 110
 111 #endif  /* HAVE_GETTIMEOFDAY */
 112
 113 #ifndef HAVE_STRNLEN
 114 size_t strnlen(const char *s, size_t maxlen)
 115 {
 116         const char *end = (const char *)memchr(s, '\0', maxlen);
 117         return end ? (size_t) (end - s) : maxlen;
 118 }
 119 #endif
 120
 121 #ifndef HAVE_STRNDUP
 122 char *strndup(const char *s, size_t n)
 123 {
 124         size_t len = strnlen(s, n);
 125         char *new = malloc(len + 1);
 126
 127         if (!new)
 128                 return NULL;
 129
 130         new[len] = '\0';
 131         return (char *) memcpy(new, s, len);
 132 }
 133 #endif
 134
 135 #ifdef _WIN32
 136 int win_select(int max_fd, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
 137 {
 138         DWORD ms_total, limit;
 139         HANDLE handles[MAXIMUM_WAIT_OBJECTS];
 140         int handle_slot_to_fd[MAXIMUM_WAIT_OBJECTS];
 141         int n_handles = 0, i;
 142         fd_set sock_read, sock_write, sock_except;
 143         fd_set aread, awrite, aexcept;
 144         int sock_max_fd = -1;
 145         struct timeval tvslice;
 146         int retcode;
 147
 148 #define SAFE_FD_ISSET(fd, set)  (set && FD_ISSET(fd, set))
 149
 150         /* calculate how long we need to wait in milliseconds */
 151         if (!tv)
 152                 ms_total = INFINITE;
 153         else {
 154                 ms_total = tv->tv_sec * 1000;
 155                 ms_total += tv->tv_usec / 1000;
 156         }
 157
 158         FD_ZERO(&sock_read);
 159         FD_ZERO(&sock_write);
 160         FD_ZERO(&sock_except);
 161
 162         /* build an array of handles for non-sockets */
 163         for (i = 0; i < max_fd; i++) {
 164                 if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
 165                         intptr_t handle = (intptr_t) _get_osfhandle(i);
 166                         handles[n_handles] = (HANDLE)handle;
 167                         if (handles[n_handles] == INVALID_HANDLE_VALUE) {
 168                                 /* socket */
 169                                 if (SAFE_FD_ISSET(i, rfds))
 170                                         FD_SET(i, &sock_read);
 171                                 if (SAFE_FD_ISSET(i, wfds))
 172                                         FD_SET(i, &sock_write);
 173                                 if (SAFE_FD_ISSET(i, efds))
 174                                         FD_SET(i, &sock_except);
 175                                 if (i > sock_max_fd)
 176                                         sock_max_fd = i;
 177                         } else {
 178                                 handle_slot_to_fd[n_handles] = i;
 179                                 n_handles++;
 180                         }
 181                 }
 182         }
 183
 184         if (n_handles == 0) {
 185                 /* plain sockets only - let winsock handle the whole thing */
 186                 return select(max_fd, rfds, wfds, efds, tv);
 187         }
 188
 189         /* mixture of handles and sockets; lets multiplex between
 190          * winsock and waiting on the handles */
 191
 192         FD_ZERO(&aread);
 193         FD_ZERO(&awrite);
 194         FD_ZERO(&aexcept);
 195
 196         limit = GetTickCount() + ms_total;
 197         do {
 198                 retcode = 0;
 199
 200                 if (sock_max_fd >= 0) {
 201                         /* overwrite the zero'd sets here; the select call
 202                          * will clear those that are not active */
 203                         aread = sock_read;
 204                         awrite = sock_write;
 205                         aexcept = sock_except;
 206
 207                         tvslice.tv_sec = 0;
 208                         tvslice.tv_usec = 1000;
 209
 210                         retcode = select(sock_max_fd + 1, &aread, &awrite, &aexcept, &tvslice);
 211                 }
 212
 213                 if (n_handles > 0) {
 214                         /* check handles */
 215                         DWORD wret;
 216
 217                         wret = MsgWaitForMultipleObjects(n_handles,
 218                                         handles,
 219                                         FALSE,
 220                                         retcode > 0 ? 0 : 1,
 221                                         QS_ALLEVENTS);
 222
 223                         if (wret == WAIT_TIMEOUT) {
 224                                 /* set retcode to 0; this is the default.
 225                                  * select() may have set it to something else,
 226                                  * in which case we leave it alone, so this branch
 227                                  * does nothing */
 228                                 ;
 229                         } else if (wret == WAIT_FAILED) {
 230                                 if (retcode == 0)
 231                                         retcode = -1;
 232                         } else {
 233                                 if (retcode < 0)
 234                                         retcode = 0;
 235                                 for (i = 0; i < n_handles; i++) {
 236                                         if (WaitForSingleObject(handles[i], 0) == WAIT_OBJECT_0) {
 237                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], rfds)) {
 238                                                         DWORD bytes;
 239                                                         intptr_t handle = (intptr_t) _get_osfhandle(
 240                                                                         handle_slot_to_fd[i]);
 241
 242                                                         if (PeekNamedPipe((HANDLE)handle, NULL, 0,
 243                                                                     NULL, &bytes, NULL)) {
 244                                                                 /* check to see if gdb pipe has data available */
 245                                                                 if (bytes) {
 246                                                                         FD_SET(handle_slot_to_fd[i], &aread);
 247                                                                         retcode++;
 248                                                                 }
 249                                                         } else {
 250                                                                 FD_SET(handle_slot_to_fd[i], &aread);
 251                                                                 retcode++;
 252                                                         }
 253                                                 }
 254                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], wfds)) {
 255                                                         FD_SET(handle_slot_to_fd[i], &awrite);
 256                                                         retcode++;
 257                                                 }
 258                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], efds)) {
 259                                                         FD_SET(handle_slot_to_fd[i], &aexcept);
 260                                                         retcode++;
 261                                                 }
 262                                         }
 263                                 }
 264                         }
 265                 }
 266         } while (retcode == 0 && (ms_total == INFINITE || GetTickCount() < limit));
 267
 268         if (rfds)
 269                 *rfds = aread;
 270         if (wfds)
 271                 *wfds = awrite;
 272         if (efds)
 273                 *efds = aexcept;
 274
 275         return retcode;
 276 }
 277 #endif