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 #ifdef HAVE_CONFIG_H
  27 #include "config.h"
  28 #endif
  29
  30 /* DANGER!!!! These must be defined *BEFORE* replacements.h and the malloc() macro!!!! */
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #ifdef HAVE_STRINGS_H
  35 #include <strings.h>
  36 #endif
  37 /*
  38  * clear_malloc
  39  *
  40  * will alloc memory and clear it
  41  */
  42 void *clear_malloc(size_t size)
  43 {
  44         void *t = malloc(size);
  45         if (t!=NULL)
  46         {
  47                 memset(t, 0x00, size);
  48         }
  49         return t;
  50 }
  51
  52 void *fill_malloc(size_t size)
  53 {
  54         void *t = malloc(size);
  55         if (t!=NULL)
  56         {
  57                 /* We want to initialize memory to some known bad state.  */
  58                 /* 0 and 0xff yields 0 and -1 as integers, which often          */
  59                 /* have meaningful values. 0x5555... is not often a valid       */
  60                 /* integer and is quite easily spotted in the debugger          */
  61                 /* also it is almost certainly an invalid address                                       */
  62                 memset(t, 0x55, size);
  63         }
  64         return t;
  65 }
  66
  67 #define IN_REPLACEMENTS_C
  68 #include "replacements.h"
  69
  70 #include <stdio.h>
  71
  72 #ifdef _WIN32
  73 #include <io.h>
  74 #endif
  75
  76 /* replacements for gettimeofday */
  77 #ifndef HAVE_GETTIMEOFDAY
  78
  79 /* Windows */
  80 #ifdef _WIN32
  81
  82 #ifndef __GNUC__
  83 #define EPOCHFILETIME (116444736000000000i64)
  84 #else
  85 #define EPOCHFILETIME (116444736000000000LL)
  86 #endif
  87
  88 int gettimeofday(struct timeval *tv, struct timezone *tz)
  89 {
  90         FILETIME ft;
  91         LARGE_INTEGER li;
  92         __int64 t;
  93         static int tzflag;
  94
  95         if (tv)
  96         {
  97                 GetSystemTimeAsFileTime(&ft);
  98                 li.LowPart  = ft.dwLowDateTime;
  99                 li.HighPart = ft.dwHighDateTime;
 100                 t  = li.QuadPart;                                       /* In 100-nanosecond intervals */
 101                 t -= EPOCHFILETIME;                                     /* Offset to the Epoch time */
 102                 t /= 10;                                                        /* In microseconds */
 103                 tv->tv_sec  = (long)(t / 1000000);
 104                 tv->tv_usec = (long)(t % 1000000);
 105         }
 106
 107         if (tz)
 108         {
 109                 if (!tzflag)
 110                 {
 111                         _tzset();
 112                         tzflag++;
 113                 }
 114                 tz->tz_minuteswest = _timezone / 60;
 115                 tz->tz_dsttime = _daylight;
 116         }
 117
 118         return 0;
 119 }
 120 #endif /* _WIN32 */
 121
 122 #endif /* HAVE_GETTIMEOFDAY */
 123
 124 #ifndef HAVE_STRNLEN
 125 size_t strnlen(const char *s, size_t maxlen)
 126 {
 127         const char *end= (const char *)memchr(s, '\0', maxlen);
 128         return end ? (size_t) (end - s) : maxlen;
 129 }
 130 #endif
 131
 132 #ifndef HAVE_STRNDUP
 133 char* strndup(const char *s, size_t n)
 134 {
 135         size_t len = strnlen (s, n);
 136         char *new = (char *) malloc (len + 1);
 137
 138         if (new == NULL)
 139                 return NULL;
 140
 141         new[len] = '\0';
 142         return (char *) memcpy (new, s, len);
 143 }
 144 #endif
 145
 146 #ifdef _WIN32
 147 int win_select(int max_fd, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeval *tv)
 148 {
 149         DWORD ms_total, limit;
 150         HANDLE handles[MAXIMUM_WAIT_OBJECTS];
 151         int handle_slot_to_fd[MAXIMUM_WAIT_OBJECTS];
 152         int n_handles = 0, i;
 153         fd_set sock_read, sock_write, sock_except;
 154         fd_set aread, awrite, aexcept;
 155         int sock_max_fd = -1;
 156         struct timeval tvslice;
 157         int retcode;
 158
 159 #define SAFE_FD_ISSET(fd, set)  (set != NULL && FD_ISSET(fd, set))
 160
 161         /* calculate how long we need to wait in milliseconds */
 162         if (tv == NULL) {
 163                 ms_total = INFINITE;
 164         } else {
 165                 ms_total = tv->tv_sec * 1000;
 166                 ms_total += tv->tv_usec / 1000;
 167         }
 168
 169         FD_ZERO(&sock_read);
 170         FD_ZERO(&sock_write);
 171         FD_ZERO(&sock_except);
 172
 173         /* build an array of handles for non-sockets */
 174         for (i = 0; i < max_fd; i++) {
 175                 if (SAFE_FD_ISSET(i, rfds) || SAFE_FD_ISSET(i, wfds) || SAFE_FD_ISSET(i, efds)) {
 176                         long handle = _get_osfhandle(i);
 177                         handles[n_handles] = (HANDLE)handle;
 178                         if (handles[n_handles] == INVALID_HANDLE_VALUE) {
 179                                 /* socket */
 180                                 if (SAFE_FD_ISSET(i, rfds)) {
 181                                         FD_SET(i, &sock_read);
 182                                 }
 183                                 if (SAFE_FD_ISSET(i, wfds)) {
 184                                         FD_SET(i, &sock_write);
 185                                 }
 186                                 if (SAFE_FD_ISSET(i, efds)) {
 187                                         FD_SET(i, &sock_except);
 188                                 }
 189                                 if (i > sock_max_fd) {
 190                                         sock_max_fd = i;
 191                                 }
 192                         } else {
 193                                 handle_slot_to_fd[n_handles] = i;
 194                                 n_handles++;
 195                         }
 196                 }
 197         }
 198
 199         if (n_handles == 0) {
 200                 /* plain sockets only - let winsock handle the whole thing */
 201                 return select(max_fd, rfds, wfds, efds, tv);
 202         }
 203
 204         /* mixture of handles and sockets; lets multiplex between
 205          * winsock and waiting on the handles */
 206
 207         FD_ZERO(&aread);
 208         FD_ZERO(&awrite);
 209         FD_ZERO(&aexcept);
 210
 211         limit = GetTickCount() + ms_total;
 212         do {
 213                 retcode = 0;
 214
 215                 if (sock_max_fd >= 0) {
 216                         /* overwrite the zero'd sets here; the select call
 217                          * will clear those that are not active */
 218                         aread = sock_read;
 219                         awrite = sock_write;
 220                         aexcept = sock_except;
 221
 222                         tvslice.tv_sec = 0;
 223                         tvslice.tv_usec = 100000;
 224
 225                         retcode = select(sock_max_fd+1, &aread, &awrite, &aexcept, &tvslice);
 226                 }
 227                 if (n_handles > 0) {
 228                         /* check handles */
 229                         DWORD wret;
 230
 231                         wret = MsgWaitForMultipleObjects(n_handles, handles, FALSE, retcode > 0 ? 0 : 100, QS_ALLEVENTS);
 232
 233                         if (wret == WAIT_TIMEOUT) {
 234                                 /* set retcode to 0; this is the default.
 235                                  * select() may have set it to something else,
 236                                  * in which case we leave it alone, so this branch
 237                                  * does nothing */
 238                                 ;
 239                         } else if (wret == WAIT_FAILED) {
 240                                 if (retcode == 0) {
 241                                         retcode = -1;
 242                                 }
 243                         } else {
 244                                 if (retcode < 0) {
 245                                         retcode = 0;
 246                                 }
 247                                 for (i = 0; i < n_handles; i++) {
 248                                         if (WAIT_OBJECT_0 == WaitForSingleObject(handles[i], 0)) {
 249                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], rfds)) {
 250                                                         DWORD dwBytes;
 251                                                         long handle = _get_osfhandle(handle_slot_to_fd[i]);
 252
 253                                                         if (PeekNamedPipe((HANDLE)handle, NULL, 0, NULL, &dwBytes, NULL))
 254                                                         {
 255                                                                 /* check to see if gdb pipe has data available */
 256                                                                 if (dwBytes)
 257                                                                 {
 258                                                                         FD_SET(handle_slot_to_fd[i], &aread);
 259                                                                         retcode++;
 260                                                                 }
 261                                                         }
 262                                                         else
 263                                                         {
 264                                                                 FD_SET(handle_slot_to_fd[i], &aread);
 265                                                                 retcode++;
 266                                                         }
 267                                                 }
 268                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], wfds)) {
 269                                                         FD_SET(handle_slot_to_fd[i], &awrite);
 270                                                         retcode++;
 271                                                 }
 272                                                 if (SAFE_FD_ISSET(handle_slot_to_fd[i], efds)) {
 273                                                         FD_SET(handle_slot_to_fd[i], &aexcept);
 274                                                         retcode++;
 275                                                 }
 276                                         }
 277                                 }
 278                         }
 279                 }
 280         } while (retcode == 0 && (ms_total == INFINITE || GetTickCount() < limit));
 281
 282         if (rfds) {
 283                 *rfds = aread;
 284         }
 285         if (wfds) {
 286                 *wfds = awrite;
 287         }
 288         if (efds) {
 289                 *efds = aexcept;
 290         }
 291
 292         return retcode;
 293 }
 294 #endif