651 lines
22 KiB
C++
651 lines
22 KiB
C++
/* miscfuncs.cc: misc funcs that don't belong anywhere else
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include "miscfuncs.h"
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#include <sys/uio.h>
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#include <assert.h>
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#include <alloca.h>
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#include <limits.h>
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#include <sys/param.h>
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#include <wchar.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include <winnls.h>
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#include "cygtls.h"
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#include "ntdll.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "pinfo.h"
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#include "exception.h"
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long tls_ix = -1;
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const char case_folded_lower[] NO_COPY = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, '!', '"', '#', '$', '%', '&', 39, '(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '[', 92, ']', '^', '_',
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', 127,
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128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
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144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
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160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
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176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
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192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
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208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
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224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
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240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
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};
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const char case_folded_upper[] NO_COPY = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
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16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
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32, '!', '"', '#', '$', '%', '&', 39, '(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', 92, ']', '^', '_',
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'`', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '{', '|', '}', '~', 127,
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128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
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144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
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160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
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176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
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192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
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208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
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224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239,
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240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255
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};
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const char isalpha_array[] NO_COPY = {
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
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0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, 0, 0, 0, 0, 0,
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0,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
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0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
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};
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extern "C" int __stdcall
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cygwin_wcscasecmp (const wchar_t *ws, const wchar_t *wt)
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{
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UNICODE_STRING us, ut;
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RtlInitUnicodeString (&us, ws);
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RtlInitUnicodeString (&ut, wt);
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return RtlCompareUnicodeString (&us, &ut, TRUE);
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}
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extern "C" int __stdcall
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cygwin_wcsncasecmp (const wchar_t *ws, const wchar_t *wt, size_t n)
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{
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UNICODE_STRING us, ut;
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size_t ls = 0, lt = 0;
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while (ws[ls] && ls < n)
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++ls;
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RtlInitCountedUnicodeString (&us, ws, ls * sizeof (WCHAR));
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while (wt[lt] && lt < n)
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++lt;
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RtlInitCountedUnicodeString (&ut, wt, lt * sizeof (WCHAR));
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return RtlCompareUnicodeString (&us, &ut, TRUE);
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}
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extern "C" int __stdcall
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cygwin_strcasecmp (const char *cs, const char *ct)
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{
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UNICODE_STRING us, ut;
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ULONG len;
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len = (strlen (cs) + 1) * sizeof (WCHAR);
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RtlInitEmptyUnicodeString (&us, (PWCHAR) alloca (len), len);
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us.Length = sys_mbstowcs (us.Buffer, us.MaximumLength, cs) * sizeof (WCHAR);
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len = (strlen (ct) + 1) * sizeof (WCHAR);
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RtlInitEmptyUnicodeString (&ut, (PWCHAR) alloca (len), len);
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ut.Length = sys_mbstowcs (ut.Buffer, ut.MaximumLength, ct) * sizeof (WCHAR);
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return RtlCompareUnicodeString (&us, &ut, TRUE);
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}
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extern "C" int __stdcall
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cygwin_strncasecmp (const char *cs, const char *ct, size_t n)
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{
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UNICODE_STRING us, ut;
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ULONG len;
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size_t ls = 0, lt = 0;
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while (cs[ls] && ls < n)
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++ls;
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len = (ls + 1) * sizeof (WCHAR);
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RtlInitEmptyUnicodeString (&us, (PWCHAR) alloca (len), len);
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us.Length = sys_mbstowcs (us.Buffer, ls + 1, cs, ls) * sizeof (WCHAR);
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while (ct[lt] && lt < n)
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++lt;
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len = (lt + 1) * sizeof (WCHAR);
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RtlInitEmptyUnicodeString (&ut, (PWCHAR) alloca (len), len);
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ut.Length = sys_mbstowcs (ut.Buffer, lt + 1, ct, lt) * sizeof (WCHAR);
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return RtlCompareUnicodeString (&us, &ut, TRUE);
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}
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extern "C" char * __stdcall
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cygwin_strlwr (char *string)
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{
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UNICODE_STRING us;
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size_t len = (strlen (string) + 1) * sizeof (WCHAR);
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us.MaximumLength = len; us.Buffer = (PWCHAR) alloca (len);
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us.Length = sys_mbstowcs (us.Buffer, len, string) * sizeof (WCHAR)
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- sizeof (WCHAR);
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RtlDowncaseUnicodeString (&us, &us, FALSE);
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sys_wcstombs (string, len / sizeof (WCHAR), us.Buffer);
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return string;
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}
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extern "C" char * __stdcall
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cygwin_strupr (char *string)
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{
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UNICODE_STRING us;
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size_t len = (strlen (string) + 1) * sizeof (WCHAR);
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us.MaximumLength = len; us.Buffer = (PWCHAR) alloca (len);
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us.Length = sys_mbstowcs (us.Buffer, len, string) * sizeof (WCHAR)
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- sizeof (WCHAR);
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RtlUpcaseUnicodeString (&us, &us, FALSE);
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sys_wcstombs (string, len / sizeof (WCHAR), us.Buffer);
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return string;
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}
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int __stdcall
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check_invalid_virtual_addr (const void *s, unsigned sz)
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{
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MEMORY_BASIC_INFORMATION mbuf;
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const void *end;
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for (end = (char *) s + sz; s < end;
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s = (char *) mbuf.BaseAddress + mbuf.RegionSize)
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if (!VirtualQuery (s, &mbuf, sizeof mbuf))
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return EINVAL;
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return 0;
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}
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static char __attribute__ ((noinline))
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dummytest (volatile char *p)
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{
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return *p;
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}
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ssize_t
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check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
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{
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if (iovcnt <= 0 || iovcnt > IOV_MAX)
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{
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set_errno (EINVAL);
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return -1;
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}
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myfault efault;
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if (efault.faulted (EFAULT))
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return -1;
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size_t tot = 0;
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while (iovcnt != 0)
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{
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if (iov->iov_len > SSIZE_MAX || (tot += iov->iov_len) > SSIZE_MAX)
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{
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set_errno (EINVAL);
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return -1;
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}
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volatile char *p = ((char *) iov->iov_base) + iov->iov_len - 1;
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if (!iov->iov_len)
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/* nothing to do */;
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else if (!forwrite)
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*p = dummytest (p);
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else
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dummytest (p);
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iov++;
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iovcnt--;
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}
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assert (tot <= SSIZE_MAX);
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return (ssize_t) tot;
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}
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/* Try hard to schedule another thread. */
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void
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yield ()
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{
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int prio = GetThreadPriority (GetCurrentThread ());
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SetThreadPriority (GetCurrentThread (), THREAD_PRIORITY_IDLE);
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for (int i = 0; i < 2; i++)
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{
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/* MSDN implies that SleepEx(0,...) will force scheduling of other
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threads. Unlike SwitchToThread() the documentation does not mention
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other cpus so, presumably (hah!), this + using a lower priority will
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stall this thread temporarily and cause another to run. */
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SleepEx (0, false);
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}
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SetThreadPriority (GetCurrentThread (), prio);
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}
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/* Get a default value for the nice factor. When changing these values,
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have a look into the below function nice_to_winprio. The values must
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match the layout of the static "priority" array. */
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int
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winprio_to_nice (DWORD prio)
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{
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switch (prio)
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{
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case REALTIME_PRIORITY_CLASS:
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return -20;
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case HIGH_PRIORITY_CLASS:
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return -16;
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case ABOVE_NORMAL_PRIORITY_CLASS:
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return -8;
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case NORMAL_PRIORITY_CLASS:
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return 0;
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case BELOW_NORMAL_PRIORITY_CLASS:
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return 8;
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case IDLE_PRIORITY_CLASS:
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return 16;
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}
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return 0;
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}
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/* Get a Win32 priority matching the incoming nice factor. The incoming
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nice is limited to the interval [-NZERO,NZERO-1]. */
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DWORD
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nice_to_winprio (int &nice)
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{
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static const DWORD priority[] NO_COPY =
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{
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REALTIME_PRIORITY_CLASS, /* 0 */
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HIGH_PRIORITY_CLASS, /* 1 */
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HIGH_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS,
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HIGH_PRIORITY_CLASS, /* 7 */
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ABOVE_NORMAL_PRIORITY_CLASS, /* 8 */
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS,
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ABOVE_NORMAL_PRIORITY_CLASS, /* 15 */
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NORMAL_PRIORITY_CLASS, /* 16 */
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS,
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NORMAL_PRIORITY_CLASS, /* 23 */
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BELOW_NORMAL_PRIORITY_CLASS, /* 24 */
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS,
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BELOW_NORMAL_PRIORITY_CLASS, /* 31 */
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IDLE_PRIORITY_CLASS, /* 32 */
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS,
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IDLE_PRIORITY_CLASS /* 39 */
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};
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if (nice < -NZERO)
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nice = -NZERO;
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else if (nice > NZERO - 1)
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nice = NZERO - 1;
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DWORD prio = priority[nice + NZERO];
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return prio;
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}
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/* Minimal overlapped pipe I/O implementation for signal and commune stuff. */
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BOOL WINAPI
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CreatePipeOverlapped (PHANDLE hr, PHANDLE hw, LPSECURITY_ATTRIBUTES sa)
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{
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int ret = fhandler_pipe::create_selectable (sa, hr, hw, 0, NULL,
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FILE_FLAG_OVERLAPPED);
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if (ret)
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SetLastError (ret);
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return ret == 0;
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}
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BOOL WINAPI
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ReadPipeOverlapped (HANDLE h, PVOID buf, DWORD len, LPDWORD ret_len,
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DWORD timeout)
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{
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OVERLAPPED ov;
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BOOL ret;
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memset (&ov, 0, sizeof ov);
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ov.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
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ret = ReadFile (h, buf, len, NULL, &ov);
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if (ret || GetLastError () == ERROR_IO_PENDING)
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{
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if (!ret && WaitForSingleObject (ov.hEvent, timeout) != WAIT_OBJECT_0)
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CancelIo (h);
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ret = GetOverlappedResult (h, &ov, ret_len, FALSE);
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}
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CloseHandle (ov.hEvent);
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return ret;
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}
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BOOL WINAPI
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WritePipeOverlapped (HANDLE h, PCVOID buf, DWORD len, LPDWORD ret_len,
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DWORD timeout)
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{
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OVERLAPPED ov;
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BOOL ret;
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memset (&ov, 0, sizeof ov);
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ov.hEvent = CreateEvent (NULL, TRUE, FALSE, NULL);
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ret = WriteFile (h, buf, len, NULL, &ov);
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if (ret || GetLastError () == ERROR_IO_PENDING)
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{
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if (!ret && WaitForSingleObject (ov.hEvent, timeout) != WAIT_OBJECT_0)
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CancelIo (h);
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ret = GetOverlappedResult (h, &ov, ret_len, FALSE);
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}
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CloseHandle (ov.hEvent);
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return ret;
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}
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/* backslashify: Convert all forward slashes in src path to back slashes
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in dst path. Add a trailing slash to dst when trailing_slash_p arg
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is set to 1. */
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void
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backslashify (const char *src, char *dst, bool trailing_slash_p)
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{
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const char *start = src;
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while (*src)
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{
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if (*src == '/')
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*dst++ = '\\';
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else
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*dst++ = *src;
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++src;
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}
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if (trailing_slash_p
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&& src > start
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&& !isdirsep (src[-1]))
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*dst++ = '\\';
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*dst++ = 0;
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}
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/* slashify: Convert all back slashes in src path to forward slashes
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in dst path. Add a trailing slash to dst when trailing_slash_p arg
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is set to 1. */
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void
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slashify (const char *src, char *dst, bool trailing_slash_p)
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{
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const char *start = src;
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while (*src)
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{
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if (*src == '\\')
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*dst++ = '/';
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else
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*dst++ = *src;
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|
++src;
|
|
}
|
|
if (trailing_slash_p
|
|
&& src > start
|
|
&& !isdirsep (src[-1]))
|
|
*dst++ = '/';
|
|
*dst++ = 0;
|
|
}
|
|
|
|
/* CygwinCreateThread.
|
|
|
|
Replacement function for CreateThread. What we do here is to remove
|
|
parameters we don't use and instead to add parameters we need to make
|
|
the function pthreads compatible. */
|
|
|
|
struct thread_wrapper_arg
|
|
{
|
|
LPTHREAD_START_ROUTINE func;
|
|
PVOID arg;
|
|
char *stackaddr;
|
|
char *stackbase;
|
|
char *commitaddr;
|
|
};
|
|
|
|
DWORD WINAPI
|
|
thread_wrapper (VOID *arg)
|
|
{
|
|
/* Just plain paranoia. */
|
|
if (!arg)
|
|
return ERROR_INVALID_PARAMETER;
|
|
|
|
/* Fetch thread wrapper info and free from cygheap. */
|
|
thread_wrapper_arg wrapper_arg = *(thread_wrapper_arg *) arg;
|
|
cfree (arg);
|
|
|
|
/* Remove _cygtls from this stack since it won't be used anymore. */
|
|
_my_tls.remove (0);
|
|
|
|
/* Set stack values in TEB */
|
|
PTEB teb = NtCurrentTeb ();
|
|
teb->Tib.StackBase = wrapper_arg.stackbase;
|
|
teb->Tib.StackLimit = wrapper_arg.commitaddr ?: wrapper_arg.stackaddr;
|
|
/* Set DeallocationStack value. If we have an application-provided stack,
|
|
we set DeallocationStack to NULL, so NtTerminateThread does not deallocate
|
|
any stack. If we created the stack in CygwinCreateThread, we set
|
|
DeallocationStack to the stackaddr of our own stack, so it's automatically
|
|
deallocated when the thread is terminated. */
|
|
char *dealloc_addr = (char *) teb->DeallocationStack;
|
|
teb->DeallocationStack = wrapper_arg.commitaddr ? wrapper_arg.stackaddr
|
|
: NULL;
|
|
/* Store the OS-provided DeallocationStack address in wrapper_arg.stackaddr.
|
|
The below assembler code will release the OS stack after switching to our
|
|
new stack. */
|
|
wrapper_arg.stackaddr = dealloc_addr;
|
|
|
|
/* Initialize new _cygtls. */
|
|
_my_tls.init_thread (wrapper_arg.stackbase - CYGTLS_PADSIZE,
|
|
(DWORD (*)(void*, void*)) wrapper_arg.func);
|
|
|
|
/* Copy exception list over to new stack. I'm not quite sure how the
|
|
exception list is extended by Windows itself. What's clear is that it
|
|
always grows downwards and that it starts right at the stackbase.
|
|
Therefore we first count the number of exception records and place
|
|
the copy at the stackbase, too, so there's still a lot of room to
|
|
extend the list up to where our _cygtls region starts. */
|
|
_exception_list *old_start = (_exception_list *) teb->Tib.ExceptionList;
|
|
unsigned count = 0;
|
|
teb->Tib.ExceptionList = NULL;
|
|
for (_exception_list *e_ptr = old_start;
|
|
e_ptr && e_ptr != (_exception_list *) -1;
|
|
e_ptr = e_ptr->prev)
|
|
++count;
|
|
if (count)
|
|
{
|
|
_exception_list *new_start = (_exception_list *) wrapper_arg.stackbase
|
|
- count;
|
|
teb->Tib.ExceptionList = (struct _EXCEPTION_REGISTRATION_RECORD *)
|
|
new_start;
|
|
while (true)
|
|
{
|
|
new_start->handler = old_start->handler;
|
|
if (old_start->prev == (_exception_list *) -1)
|
|
{
|
|
new_start->prev = (_exception_list *) -1;
|
|
break;
|
|
}
|
|
new_start->prev = new_start + 1;
|
|
new_start = new_start->prev;
|
|
old_start = old_start->prev;
|
|
}
|
|
}
|
|
|
|
__asm__ ("\n\
|
|
movl %[WRAPPER_ARG], %%ebx # Load &wrapper_arg into ebx \n\
|
|
movl (%%ebx), %%eax # Load thread func into eax \n\
|
|
movl 4(%%ebx), %%ecx # Load thread arg into ecx \n\
|
|
movl 8(%%ebx), %%edx # Load stackaddr into edx \n\
|
|
movl 12(%%ebx), %%ebx # Load stackbase into ebx \n\
|
|
subl %[CYGTLS], %%ebx # Subtract CYGTLS_PADSIZE \n\
|
|
subl $4, %%ebx # Subtract another 4 bytes \n\
|
|
movl %%ebx, %%esp # Set esp \n\
|
|
xorl %%ebp, %%ebp # Set ebp to 0 \n\
|
|
# Now we moved to the new stack. Save thread func address\n\
|
|
# and thread arg on new stack \n\
|
|
pushl %%ecx # Push thread arg onto stack \n\
|
|
pushl %%eax # Push thread func onto stack \n\
|
|
# Now it's safe to release the OS stack. \n\
|
|
pushl $0x8000 # dwFreeType: MEM_RELEASE \n\
|
|
pushl $0x0 # dwSize: 0 \n\
|
|
pushl %%edx # lpAddress: stackaddr \n\
|
|
call _VirtualFree@12 # Shoot \n\
|
|
# All set. We can pop the thread function address from \n\
|
|
# the stack and call it. The thread arg is still on the \n\
|
|
# stack in the expected spot. \n\
|
|
popl %%eax # Pop thread_func address \n\
|
|
call *%%eax # Call thread func \n"
|
|
: : [WRAPPER_ARG] "r" (&wrapper_arg),
|
|
[CYGTLS] "i" (CYGTLS_PADSIZE));
|
|
/* Never return from here. */
|
|
ExitThread (0);
|
|
}
|
|
|
|
/* FIXME: This should be settable via setrlimit (RLIMIT_STACK). */
|
|
#define DEFAULT_STACKSIZE (512 * 1024)
|
|
|
|
HANDLE WINAPI
|
|
CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
|
|
PVOID stackaddr, ULONG stacksize, ULONG guardsize,
|
|
DWORD creation_flags, LPDWORD thread_id)
|
|
{
|
|
PVOID real_stackaddr = NULL;
|
|
ULONG real_stacksize = 0;
|
|
ULONG real_guardsize = 0;
|
|
thread_wrapper_arg *wrapper_arg;
|
|
HANDLE thread = NULL;
|
|
|
|
wrapper_arg = (thread_wrapper_arg *) ccalloc (HEAP_STR, 1,
|
|
sizeof *wrapper_arg);
|
|
if (!wrapper_arg)
|
|
{
|
|
SetLastError (ERROR_OUTOFMEMORY);
|
|
return NULL;
|
|
}
|
|
wrapper_arg->func = thread_func;
|
|
wrapper_arg->arg = thread_arg;
|
|
|
|
/* Set stacksize. */
|
|
real_stacksize = stacksize ?: DEFAULT_STACKSIZE;
|
|
if (real_stacksize < PTHREAD_STACK_MIN)
|
|
real_stacksize = PTHREAD_STACK_MIN;
|
|
if (stackaddr)
|
|
{
|
|
/* If the application provided the stack, just use it. */
|
|
wrapper_arg->stackaddr = (char *) stackaddr;
|
|
wrapper_arg->stackbase = (char *) stackaddr + real_stacksize;
|
|
}
|
|
else
|
|
{
|
|
/* If not, we have to create the stack here. */
|
|
real_stacksize = roundup2 (real_stacksize, wincap.page_size ());
|
|
/* If no guardsize has been specified by the application, use the
|
|
system pagesize as default. */
|
|
real_guardsize = (guardsize != (ULONG) -1)
|
|
? guardsize : wincap.page_size ();
|
|
if (real_guardsize)
|
|
real_guardsize = roundup2 (real_guardsize, wincap.page_size ());
|
|
/* Add the guardsize to the stacksize, but only if the stacksize and
|
|
the guardsize have been explicitely specified. */
|
|
if (stacksize || guardsize != (ULONG) -1)
|
|
real_stacksize += real_guardsize;
|
|
/* Now roundup the result to the next allocation boundary. */
|
|
real_stacksize = roundup2 (real_stacksize,
|
|
wincap.allocation_granularity ());
|
|
/* Reserve stack.
|
|
FIXME? If the TOP_DOWN method tends to collide too much with
|
|
other stuff, we should provide our own mechanism to find a
|
|
suitable place for the stack. Top down from the start of
|
|
the Cygwin DLL comes to mind. */
|
|
real_stackaddr = VirtualAlloc (NULL, real_stacksize,
|
|
MEM_RESERVE | MEM_TOP_DOWN,
|
|
PAGE_EXECUTE_READWRITE);
|
|
if (!real_stackaddr)
|
|
return NULL;
|
|
/* Set up committed region. In contrast to the OS we commit 64K and
|
|
set up just a single guard page at the end. */
|
|
char *commitaddr = (char *) real_stackaddr
|
|
+ real_stacksize
|
|
- wincap.allocation_granularity ();
|
|
if (!VirtualAlloc (commitaddr, wincap.page_size (), MEM_COMMIT,
|
|
PAGE_EXECUTE_READWRITE | PAGE_GUARD))
|
|
goto err;
|
|
commitaddr += wincap.page_size ();
|
|
if (!VirtualAlloc (commitaddr, wincap.allocation_granularity ()
|
|
- wincap.page_size (), MEM_COMMIT,
|
|
PAGE_EXECUTE_READWRITE))
|
|
goto err;
|
|
if (real_guardsize)
|
|
VirtualAlloc (real_stackaddr, real_guardsize, MEM_COMMIT,
|
|
PAGE_NOACCESS);
|
|
wrapper_arg->stackaddr = (char *) real_stackaddr;
|
|
wrapper_arg->stackbase = (char *) real_stackaddr + real_stacksize;
|
|
wrapper_arg->commitaddr = commitaddr;
|
|
}
|
|
/* Use the STACK_SIZE_PARAM_IS_A_RESERVATION parameter so only the
|
|
minimum size for a thread stack is reserved by the OS. This doesn't
|
|
work on Windows 2000, but we deallocate the OS stack in thread_wrapper
|
|
anyway, so this should be a problem only in a tight memory condition.
|
|
Note that we reserve a 256K stack, not 64K, otherwise the thread creation
|
|
might crash the process due to a stack overflow. */
|
|
thread = CreateThread (&sec_none_nih, 4 * PTHREAD_STACK_MIN,
|
|
thread_wrapper, wrapper_arg,
|
|
creation_flags | STACK_SIZE_PARAM_IS_A_RESERVATION,
|
|
thread_id);
|
|
|
|
err:
|
|
if (!thread && real_stackaddr)
|
|
{
|
|
/* Don't report the wrong error even though VirtualFree is very unlikely
|
|
to fail. */
|
|
DWORD err = GetLastError ();
|
|
VirtualFree (real_stackaddr, 0, MEM_RELEASE);
|
|
SetLastError (err);
|
|
}
|
|
return thread;
|
|
}
|