tor-browser

The Tor Browser
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Memory.c (4010B)

      1 /***************************************************************************************************
      2 
      3  Zyan Core Library (Zycore-C)
      4 
      5  Original Author : Florian Bernd
      6 
      7 * Permission is hereby granted, free of charge, to any person obtaining a copy
      8 * of this software and associated documentation files (the "Software"), to deal
      9 * in the Software without restriction, including without limitation the rights
     10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11 * copies of the Software, and to permit persons to whom the Software is
     12 * furnished to do so, subject to the following conditions:
     13 *
     14 * The above copyright notice and this permission notice shall be included in all
     15 * copies or substantial portions of the Software.
     16 *
     17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23 * SOFTWARE.
     24 
     25 ***************************************************************************************************/
     26 
     27 #include "zydis/Zycore/API/Memory.h"
     28 
     29 #ifndef ZYAN_NO_LIBC
     30 
     31 #if   defined(ZYAN_WINDOWS)
     32 
     33 #elif defined(ZYAN_POSIX)
     34 #   include <unistd.h>
     35 #else
     36 #   error "Unsupported platform detected"
     37 #endif
     38 
     39 /* ============================================================================================== */
     40 /* Exported functions                                                                             */
     41 /* ============================================================================================== */
     42 
     43 /* ---------------------------------------------------------------------------------------------- */
     44 /* General                                                                                        */
     45 /* ---------------------------------------------------------------------------------------------- */
     46 
     47 ZyanU32 ZyanMemoryGetSystemPageSize(void)
     48 {
     49 #if defined(ZYAN_WINDOWS)
     50 
     51    SYSTEM_INFO system_info;
     52    GetSystemInfo(&system_info);
     53 
     54    return system_info.dwPageSize;
     55 
     56 #elif defined(ZYAN_POSIX)
     57 
     58    return sysconf(_SC_PAGE_SIZE);
     59 
     60 #endif
     61 }
     62 
     63 ZyanU32 ZyanMemoryGetSystemAllocationGranularity(void)
     64 {
     65 #if defined(ZYAN_WINDOWS)
     66 
     67    SYSTEM_INFO system_info;
     68    GetSystemInfo(&system_info);
     69 
     70    return system_info.dwAllocationGranularity;
     71 
     72 #elif defined(ZYAN_POSIX)
     73 
     74    return sysconf(_SC_PAGE_SIZE);
     75 
     76 #endif
     77 }
     78 
     79 /* ---------------------------------------------------------------------------------------------- */
     80 /* Memory management                                                                              */
     81 /* ---------------------------------------------------------------------------------------------- */
     82 
     83 ZyanStatus ZyanMemoryVirtualProtect(void* address, ZyanUSize size, 
     84    ZyanMemoryPageProtection protection)
     85 {
     86 #if defined(ZYAN_WINDOWS)
     87 
     88    DWORD old;
     89    if (!VirtualProtect(address, size, protection, &old))
     90    {
     91        return ZYAN_STATUS_BAD_SYSTEMCALL;
     92    }
     93 
     94 #elif defined(ZYAN_POSIX)
     95 
     96    if (mprotect(address, size, protection))
     97    {
     98        return ZYAN_STATUS_BAD_SYSTEMCALL;
     99    }
    100 
    101 #endif
    102 
    103    return ZYAN_STATUS_SUCCESS;
    104 }
    105 
    106 ZyanStatus ZyanMemoryVirtualFree(void* address, ZyanUSize size)
    107 {
    108 #if defined(ZYAN_WINDOWS)
    109 
    110    ZYAN_UNUSED(size);
    111    if (!VirtualFree(address, 0, MEM_RELEASE))
    112    {
    113        return ZYAN_STATUS_BAD_SYSTEMCALL;
    114    }
    115 
    116 #elif defined(ZYAN_POSIX)
    117 
    118    if (munmap(address, size))
    119    {
    120        return ZYAN_STATUS_BAD_SYSTEMCALL;
    121    }
    122 
    123 #endif
    124 
    125    return ZYAN_STATUS_SUCCESS;    
    126 }
    127 
    128 /* ---------------------------------------------------------------------------------------------- */
    129 
    130 /* ============================================================================================== */
    131 
    132 #endif /* ZYAN_NO_LIBC */