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, write to the                         *
  23  *   Free Software Foundation, Inc.,                                       *
  24  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  25  ***************************************************************************/
  26 /* DANGER!!!! These must be defined *BEFORE* replacements.h and the malloc() macro!!!! */
  27
  28 #include <stdlib.h>
  29 #include <string.h>
  30 /*
  31  * clear_malloc
  32  *
  33  * will alloc memory and clear it
  34  */
  35 void *clear_malloc(size_t size)
  36 {
  37         void *t = malloc(size);
  38         if (t != NULL)
  39         {
  40                 memset(t, 0x00, size);
  41         }
  42         return t;
  43 }
  44
  45 void *fill_malloc(size_t size)
  46 {
  47         void *t = malloc(size);
  48         if (t != NULL)
  49         {
  50                 /* We want to initialize memory to some known bad state.  */
  51                 /* 0 and 0xff yields 0 and -1 as integers, which often          */
  52                 /* have meaningful values. 0x5555... is not often a valid       */
  53                 /* integer and is quite easily spotted in the debugger          */
  54                 /* also it is almost certainly an invalid address                                       */
  55                 memset(t, 0x55, size);
  56         }
  57         return t;
  58 }
  59
  60 #define IN_REPLACEMENTS_C
  61 #ifdef HAVE_CONFIG_H
  62 #include "config.h"
  63 #endif
  64 #ifdef HAVE_STRINGS_H
  65 #include <strings.h>
  66 #endif
  67
  68 #ifdef _WIN32
  69 #include <io.h>
  70 #endif
  71
  72 /* replacements for gettimeofday */
  73 #ifndef HAVE_GETTIMEOFDAY
  74
  75 /* Windows */
  76 #ifdef _WIN32
  77
  78 #ifndef __GNUC__
  79 #define EPOCHFILETIME (116444736000000000i64)
  80 #else
  81 #define EPOCHFILETIME (116444736000000000LL)
  82 #endif
  83
  84 int gettimeofday(struct timeval *tv, struct timezone *tz)
  85 {
  86         FILETIME ft;
  87         LARGE_INTEGER li;
  88         __int64 t;
  89         static int tzflag;
  90
  91         if (tv)
  92         {
  93                 GetSystemTimeAsFileTime(&ft);
  94                 li.LowPart  = ft.dwLowDateTime;
  95                 li.HighPart = ft.dwHighDateTime;
  96                 t  = li.QuadPart;                                       /* In 100-nanosecond intervals */
  97                 t -= EPOCHFILETIME;                                     /* Offset to the Epoch time */
  98                 t /= 10;                                                        /* In microseconds */
  99                 tv->tv_sec  = (long)(t / 1000000);
 100                 tv->tv_usec = (long)(t % 1000000);
 101         }
 102
 103         if (tz)
 104         {
 105                 if (!tzflag)
 106                 {
 107                         _tzset();
 108                         tzflag++;
 109                 }
 110                 tz->tz_minuteswest = _timezone / 60;
 111                 tz->tz_dsttime = _daylight;
 112         }
 113
 114         return 0;
 115 }
 116 #endif /* _WIN32 */
 117
 118 #endif /* HAVE_GETTIMEOFDAY */
 119
 120 #ifndef HAVE_STRNLEN
 121 size_t strnlen(const char *s, size_t maxlen)
 122 {
 123         const char *end= (const char *)memchr(s, '\0', maxlen);
 124         return end ? (size_t) (end - s) : maxlen;
 125 }
 126 #endif
 127
 128 #ifndef HAVE_STRNDUP
 129 char* strndup(const char *s, size_t n)
 130 {
 131         size_t len = strnlen (s, n);
 132         char *new = (char *) malloc (len + 1);
 133
 134         if (new == NULL)
 135                 return NULL;
 136
 137         new[len] = '\0';
 138         return (char *) memcpy (new, s, len);
 139 }
 140 #endif
 141
 142 #ifdef _WIN32
 143 int win_select(int max_fd, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
 144 {
 145         DWORD ms_total, limit;
 146         HANDLE handles[MAXIMUM_WAIT_OBJECTS];
 147         int handle_slot_to_fd[MAXIMUM_WAIT_OBJECTS];
 148         int n_handles = 0, i;
 149         fd_set sock_read, sock_write, sock_except;
 150         fd_set aread, awrite, aexcept;
 151         int sock_max_fd = -1;
 152         struct timeval tvslice;
 153         int retcode;
 154
 155 #define SAFE_FD_ISSET(fd, set)  (set != NULL && FD_ISSET(fd, set))
 156
 157         /* calculate how long we need to wait in milliseconds */
 158         if (tv == NULL) {
 159                 ms_total = INFINITE;
 160         } else {
 161                 ms_total = tv->tv_sec * 1000;
 162                 ms_total += tv->tv_usec / 1000;
 163         }
 164
 165         FD_ZERO(&sock_read);
 166         FD_ZERO(&sock_write);
 167         FD_ZERO(&sock_except);
 168
 169         /* build an array of handles for non-sockets */
 170         for (i = 0; i < max_fd; i++) {
 171                 if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
 172                         intptr_t handle = (intptr_t) _get_osfhandle(i);
 173                         handles[n_handles] = (HANDLE)handle;
 174                         if (handles[n_handles] == INVALID_HANDLE_VALUE) {
 175                                 /* socket */
 176                                 if (SAFE_FD_ISSET(i, rfds)) {
 177                                         FD_SET(i, &sock_read);
 178                                 }
 179                                 if (SAFE_FD_ISSET(i, wfds)) {
 180                                         FD_SET(i, &sock_write);
 181                                 }
 182                                 if (SAFE_FD_ISSET(i, efds)) {
 183                                         FD_SET(i, &sock_except);
 184                                 }
 185                                 if (i > sock_max_fd) {
 186                                         sock_max_fd = i;
 187                                 }
 188                         } else {
 189                                 handle_slot_to_fd[n_handles] = i;
 190                                 n_handles++;
 191                         }
 192                 }
 193         }
 194
 195         if (n_handles == 0) {
 196                 /* plain sockets only - let winsock handle the whole thing */
 197                 return select(max_fd, rfds, wfds, efds, tv);
 198         }
 199
 200         /* mixture of handles and sockets; lets multiplex between
 201          * winsock and waiting on the handles */
 202
 203         FD_ZERO(&aread);
 204         FD_ZERO(&awrite);
 205         FD_ZERO(&aexcept);
 206
 207         limit = GetTickCount() + ms_total;
 208         do {
 209                 retcode = 0;
 210
 211                 if (sock_max_fd >= 0) {
 212                         /* overwrite the zero'd sets here; the select call
 213                          * will clear those that are not active */
 214                         aread = sock_read;
 215                         awrite = sock_write;
 216                         aexcept = sock_except;
 217
 218                         tvslice.tv_sec = 0;
 219                         tvslice.tv_usec = 100000;
 220
 221                         retcode = select(sock_max_fd + 1, &aread, &awrite, &aexcept, &tvslice);
 222                 }
 223                 if (n_handles > 0) {
 224                         /* check handles */
 225                         DWORD wret;
 226
 227                         wret = MsgWaitForMultipleObjects(n_handles, handles, FALSE, retcode > 0 ? 0 : 100, QS_ALLEVENTS);
 228
 229                         if (wret == WAIT_TIMEOUT) {
 230                                 /* set retcode to 0; this is the default.
 231                                  * select() may have set it to something else,
 232                                  * in which case we leave it alone, so this branch
 233                                  * does nothing */
 234                                 ;
 235                         } else if (wret == WAIT_FAILED) {
 236                                 if (retcode == 0) {
 237                                         retcode = -1;
 238                                 }
 239                         } else {
 240                                 if (retcode < 0) {
 241                                         retcode = 0;
 242                                 }
 243                                 for (i = 0; i < n_handles; i++) {
 244                                         if (WAIT_OBJECT_0 == WaitForSingleObject(handles[i], 0)) {
 245                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], rfds)) {
 246                                                         DWORD dwBytes;
 247                                                         intptr_t handle = (intptr_t) _get_osfhandle(handle_slot_to_fd[i]);
 248
 249                                                         if (PeekNamedPipe((HANDLE)handle, NULL, 0, NULL, &dwBytes, NULL))
 250                                                         {
 251                                                                 /* check to see if gdb pipe has data available */
 252                                                                 if (dwBytes)
 253                                                                 {
 254                                                                         FD_SET(handle_slot_to_fd[i], &aread);
 255                                                                         retcode++;
 256                                                                 }
 257                                                         }
 258                                                         else
 259                                                         {
 260                                                                 FD_SET(handle_slot_to_fd[i], &aread);
 261                                                                 retcode++;
 262                                                         }
 263                                                 }
 264                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], wfds)) {
 265                                                         FD_SET(handle_slot_to_fd[i], &awrite);
 266                                                         retcode++;
 267                                                 }
 268                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], efds)) {
 269                                                         FD_SET(handle_slot_to_fd[i], &aexcept);
 270                                                         retcode++;
 271                                                 }
 272                                         }
 273                                 }
 274                         }
 275                 }
 276         } while (retcode == 0 && (ms_total == INFINITE || GetTickCount() < limit));
 277
 278         if (rfds) {
 279                 *rfds = aread;
 280         }
 281         if (wfds) {
 282                 *wfds = awrite;
 283         }
 284         if (efds) {
 285                 *efds = aexcept;
 286         }
 287
 288         return retcode;
 289 }
 290 #endif