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* go32-nat.c (go32_sysinfo): Check if the call to

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__dpmi_get_capabilities fills the buffer with information, and
	don't use the buffer if not.
This commit is contained in:
Eli Zaretskii 2009-04-18 08:16:34 +00:00
parent 45be3704c8
commit d647eed6d5
2 changed files with 22 additions and 3 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2009-04-18 Eli Zaretskii <eliz@gnu.org>
* go32-nat.c (go32_sysinfo): Check if the call to
__dpmi_get_capabilities fills the buffer with information, and
don't use the buffer if not.
2009-04-17 Tom Tromey <tromey@redhat.com>
* charset.c (_initialize_charset): Add special case for "646".

19
gdb/go32-nat.c
View File

@ -983,6 +983,10 @@ print_mem (unsigned long datum, const char *header, int in_pages_p)
static void
go32_sysinfo (char *arg, int from_tty)
{
static const char test_pattern[] =
"deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
"deadbeafdeadbeafdeadbeafdeadbeafdeadbeaf"
"deadbeafdeadbeafdeadbeafdeadbeafdeadbeafdeadbeaf";
struct utsname u;
char cpuid_vendor[13];
unsigned cpuid_max = 0, cpuid_eax, cpuid_ebx, cpuid_ecx, cpuid_edx;
@ -990,8 +994,7 @@ go32_sysinfo (char *arg, int from_tty)
unsigned advertized_dos_version = ((unsigned int)_osmajor << 8) | _osminor;
int dpmi_flags;
char dpmi_vendor_info[129];
int dpmi_vendor_available =
__dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info);
int dpmi_vendor_available;
__dpmi_version_ret dpmi_version_data;
long eflags;
__dpmi_free_mem_info mem_info;
@ -1218,7 +1221,15 @@ go32_sysinfo (char *arg, int from_tty)
else if (true_dos_version == 0x532 && advertized_dos_version == 0x500)
printf_filtered ("Windows Version................Windows NT family (W2K/XP/W2K3/Vista/W2K8)\n");
puts_filtered ("\n");
if (dpmi_vendor_available == 0)
/* On some versions of Windows, __dpmi_get_capabilities returns
zero, but the buffer is not filled with info, so we fill the
buffer with a known pattern and test for it afterwards. */
memcpy (dpmi_vendor_info, test_pattern, sizeof(dpmi_vendor_info));
dpmi_vendor_available =
__dpmi_get_capabilities (&dpmi_flags, dpmi_vendor_info);
if (dpmi_vendor_available == 0
&& memcmp (dpmi_vendor_info, test_pattern,
sizeof(dpmi_vendor_info)) != 0)
{
/* The DPMI spec says the vendor string should be ASCIIZ, but
I don't trust the vendors to follow that... */
@ -1230,6 +1241,8 @@ go32_sysinfo (char *arg, int from_tty)
(unsigned)dpmi_vendor_info[1],
((unsigned)dpmi_flags & 0x7f));
}
else
printf_filtered ("DPMI Host......................(Info not available)\n");
__dpmi_get_version (&dpmi_version_data);
printf_filtered ("DPMI Version...................%d.%02d\n",
dpmi_version_data.major, dpmi_version_data.minor);