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Cygwin: pty: Move function hook_api() into hookapi.cc.

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- PTY uses Win32 API hook for pseudo console suppot. The function
  hook_api() is used for this purpose and defined in fhandler_tty.cc
  previously. This patch moves it into hookapi.cc.
This commit is contained in:
Takashi Yano
2019-09-04 10:44:25 +09:00
committed by Corinna Vinschen
parent bddb018e10
commit ffbb9b4971
3 changed files with 35 additions and 44 deletions
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34
winsup/cygwin/hookapi.cc
View File

@ -428,6 +428,40 @@ hook_or_detect_cygwin (const char *name, const void *fn, WORD& subsys, HANDLE h)
return fh.origfn;
}
/* Hook a function in any DLL such as kernel32.dll */
/* The DLL must be loaded in advance. */
/* Used in fhandler_tty.cc */
void *hook_api (const char *mname, const char *name, const void *fn)
{
HMODULE hm = GetModuleHandle (mname);
PIMAGE_NT_HEADERS pExeNTHdr =
rva (PIMAGE_NT_HEADERS, hm, PIMAGE_DOS_HEADER (hm)->e_lfanew);
DWORD importRVA = pExeNTHdr->OptionalHeader.DataDirectory
[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;
PIMAGE_IMPORT_DESCRIPTOR pdfirst =
rva (PIMAGE_IMPORT_DESCRIPTOR, hm, importRVA);
for (PIMAGE_IMPORT_DESCRIPTOR pd = pdfirst; pd->FirstThunk; pd++)
{
if (pd->OriginalFirstThunk == 0)
continue;
PIMAGE_THUNK_DATA pt = rva (PIMAGE_THUNK_DATA, hm, pd->FirstThunk);
PIMAGE_THUNK_DATA pn =
rva (PIMAGE_THUNK_DATA, hm, pd->OriginalFirstThunk);
for (PIMAGE_THUNK_DATA pi = pt; pn->u1.Ordinal; pi++, pn++)
{
if (IMAGE_SNAP_BY_ORDINAL (pn->u1.Ordinal))
continue;
PIMAGE_IMPORT_BY_NAME pimp =
rva (PIMAGE_IMPORT_BY_NAME, hm, pn->u1.AddressOfData);
if (strcmp (name, (char *) pimp->Name) != 0)
continue;
void *origfn = putmem (pi, fn);
return origfn;
}
}
return NULL;
}
void
ld_preload ()
{