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/* Internal interfaces for the Windows code
Copyright (C) 1995-2019 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "gdbsupport/common-defs.h"
#include "nat/windows-nat.h"
namespace windows_nat
{
windows_thread_info::~windows_thread_info ()
{
CloseHandle (h);
}
void
windows_thread_info::suspend ()
{
if (suspended != 0)
return;
if (SuspendThread (h) == (DWORD) -1)
{
DWORD err = GetLastError ();
/* We get Access Denied (5) when trying to suspend
threads that Windows started on behalf of the
debuggee, usually when those threads are just
about to exit.
We can get Invalid Handle (6) if the main thread
has exited. */
if (err != ERROR_INVALID_HANDLE && err != ERROR_ACCESS_DENIED)
warning (_("SuspendThread (tid=0x%x) failed. (winerr %u)"),
(unsigned) tid, (unsigned) err);
suspended = -1;
}
else
suspended = 1;
}
void
windows_thread_info::resume ()
{
if (suspended > 0)
{
stopped_at_software_breakpoint = false;
if (ResumeThread (h) == (DWORD) -1)
{
DWORD err = GetLastError ();
warning (_("warning: ResumeThread (tid=0x%x) failed. (winerr %u)"),
(unsigned) tid, (unsigned) err);
}
}
suspended = 0;
}
const char *
get_image_name (HANDLE h, void *address, int unicode)
{
#ifdef __CYGWIN__
static char buf[MAX_PATH];
#else
static char buf[(2 * MAX_PATH) + 1];
#endif
DWORD size = unicode ? sizeof (WCHAR) : sizeof (char);
char *address_ptr;
int len = 0;
char b[2];
SIZE_T done;
/* Attempt to read the name of the dll that was detected.
This is documented to work only when actively debugging
a program. It will not work for attached processes. */
if (address == NULL)
return NULL;
#ifdef _WIN32_WCE
/* Windows CE reports the address of the image name,
instead of an address of a pointer into the image name. */
address_ptr = address;
#else
/* See if we could read the address of a string, and that the
address isn't null. */
if (!ReadProcessMemory (h, address, &address_ptr,
sizeof (address_ptr), &done)
|| done != sizeof (address_ptr)
|| !address_ptr)
return NULL;
#endif
/* Find the length of the string. */
while (ReadProcessMemory (h, address_ptr + len++ * size, &b, size, &done)
&& (b[0] != 0 || b[size - 1] != 0) && done == size)
continue;
if (!unicode)
ReadProcessMemory (h, address_ptr, buf, len, &done);
else
{
WCHAR *unicode_address = (WCHAR *) alloca (len * sizeof (WCHAR));
ReadProcessMemory (h, address_ptr, unicode_address, len * sizeof (WCHAR),
&done);
#ifdef __CYGWIN__
wcstombs (buf, unicode_address, MAX_PATH);
#else
WideCharToMultiByte (CP_ACP, 0, unicode_address, len, buf, sizeof buf,
0, 0);
#endif
}
return buf;
}
}
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