The Tor Browser: ipc/glue/FileDescriptor.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "FileDescriptor.h"

     7 #include "mozilla/Assertions.h"

     8 #include "nsDebug.h"

    10 #ifdef XP_WIN

    12 #include <windows.h>

    13 #define INVALID_HANDLE INVALID_HANDLE_VALUE

    15 #else // XP_WIN

    17 #include <unistd.h>

    19 #ifndef OS_POSIX

    20 #define OS_POSIX

    21 #endif

    23 #include "base/eintr_wrapper.h"

    24 #define INVALID_HANDLE -1

    26 #endif // XP_WIN

    28 using mozilla::ipc::FileDescriptor;

    30 FileDescriptor::FileDescriptor()

    31 : mHandle(INVALID_HANDLE), mHandleCreatedByOtherProcess(false),

    32   mHandleCreatedByOtherProcessWasUsed(false)

    33 { }

    35 FileDescriptor::FileDescriptor(PlatformHandleType aHandle)

    36 : mHandle(INVALID_HANDLE), mHandleCreatedByOtherProcess(false),

    37   mHandleCreatedByOtherProcessWasUsed(false)

    38 {

    39   DuplicateInCurrentProcess(aHandle);

    40 }

    42 void

    43 FileDescriptor::DuplicateInCurrentProcess(PlatformHandleType aHandle)

    44 {

    45   MOZ_ASSERT_IF(mHandleCreatedByOtherProcess,

    46                 mHandleCreatedByOtherProcessWasUsed);

    48   if (IsValid(aHandle)) {

    49     PlatformHandleType newHandle;

    50 #ifdef XP_WIN

    51     if (DuplicateHandle(GetCurrentProcess(), aHandle, GetCurrentProcess(),

    52                         &newHandle, 0, FALSE, DUPLICATE_SAME_ACCESS)) {

    53 #else // XP_WIN

    54     if ((newHandle = dup(aHandle)) != INVALID_HANDLE) {

    55 #endif

    56       mHandle = newHandle;

    57       return;

    58     }

    59     NS_WARNING("Failed to duplicate file handle for current process!");

    60   }

    62   mHandle = INVALID_HANDLE;

    63 }

    65 void

    66 FileDescriptor::CloseCurrentProcessHandle()

    67 {

    68   MOZ_ASSERT_IF(mHandleCreatedByOtherProcess,

    69                 mHandleCreatedByOtherProcessWasUsed);

    71   // Don't actually close handles created by another process.

    72   if (mHandleCreatedByOtherProcess) {

    73     return;

    74   }

    76   if (IsValid()) {

    77 #ifdef XP_WIN

    78     if (!CloseHandle(mHandle)) {

    79       NS_WARNING("Failed to close file handle for current process!");

    80     }

    81 #else // XP_WIN

    82     HANDLE_EINTR(close(mHandle));

    83 #endif

    84     mHandle = INVALID_HANDLE;

    85   }

    86 }

    88 FileDescriptor::PickleType

    89 FileDescriptor::ShareTo(const FileDescriptor::IPDLPrivate&,

    90                         FileDescriptor::ProcessHandle aOtherProcess) const

    91 {

    92   PlatformHandleType newHandle;

    93 #ifdef XP_WIN

    94   if (IsValid()) {

    95     if (DuplicateHandle(GetCurrentProcess(), mHandle, aOtherProcess,

    96                         &newHandle, 0, FALSE, DUPLICATE_SAME_ACCESS)) {

    97       return newHandle;

    98     }

    99     NS_WARNING("Failed to duplicate file handle for other process!");

   100   }

   101   return INVALID_HANDLE;

   102 #else // XP_WIN

   103   if (IsValid()) {

   104     newHandle = dup(mHandle);

   105     if (IsValid(newHandle)) {

   106       return base::FileDescriptor(newHandle, /* auto_close */ true);

   107     }

   108     NS_WARNING("Failed to duplicate file handle for other process!");

   109   }

   110   return base::FileDescriptor();

   111 #endif

   113   MOZ_CRASH("Must not get here!");

   114 }

   116 // static

   117 bool

   118 FileDescriptor::IsValid(PlatformHandleType aHandle)

   119 {

   120   return aHandle != INVALID_HANDLE;

   121 }

The Tor Browser / file revision