任何人都可以向我指出在 Win32 上实现 mkstemp() (C/C++) 的代码，或者非常接近的模拟。
必须是无种族的。
它应该看起来像
#include <windows.h>
#include <io.h>
// port of mkstemp() to win32. race-free.
// behaviour as described in http://linux.die.net/man/3/mkstemp
//
int mkstemp(char *template) {
...
}
谢谢
wcecompatsrc/stdlib_extras.cpp/* mkstemp extracted from libc/sysdeps/posix/tempname.c. Copyright
(C) 1991-1999, 2000, 2001, 2006 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version. */
static const char letters[] =
"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
/* Generate a temporary file name based on TMPL. TMPL must match the
rules for mk[s]temp (i.e. end in "XXXXXX"). The name constructed
does not exist at the time of the call to mkstemp. TMPL is
overwritten with the result. */
int
mkstemp (char *tmpl)
{
int len;
char *XXXXXX;
static unsigned long long value;
unsigned long long random_time_bits;
unsigned int count;
int fd = -1;
int save_errno = errno;
/* A lower bound on the number of temporary files to attempt to
generate. The maximum total number of temporary file names that
can exist for a given template is 62**6. It should never be
necessary to try all these combinations. Instead if a reasonable
number of names is tried (we define reasonable as 62**3) fail to
give the system administrator the chance to remove the problems. */
#define ATTEMPTS_MIN (62 * 62 * 62)
/* The number of times to attempt to generate a temporary file. To
conform to POSIX, this must be no smaller than TMP_MAX. */
#if ATTEMPTS_MIN < TMP_MAX
unsigned int attempts = TMP_MAX;
#else
unsigned int attempts = ATTEMPTS_MIN;
#endif
len = strlen (tmpl);
if (len < 6 || strcmp (&tmpl[len - 6], "XXXXXX"))
{
errno = EINVAL;
return -1;
}
/* This is where the Xs start. */
XXXXXX = &tmpl[len - 6];
/* Get some more or less random data. */
{
SYSTEMTIME stNow;
FILETIME ftNow;
// get system time
GetSystemTime(&stNow);
stNow.wMilliseconds = 500;
if (!SystemTimeToFileTime(&stNow, &ftNow))
{
errno = -1;
return -1;
}
random_time_bits = (((unsigned long long)ftNow.dwHighDateTime << 32)
| (unsigned long long)ftNow.dwLowDateTime);
}
value += random_time_bits ^ (unsigned long long)GetCurrentThreadId ();
for (count = 0; count < attempts; value += 7777, ++count)
{
unsigned long long v = value;
/* Fill in the random bits. */
XXXXXX[0] = letters[v % 62];
v /= 62;
XXXXXX[1] = letters[v % 62];
v /= 62;
XXXXXX[2] = letters[v % 62];
v /= 62;
XXXXXX[3] = letters[v % 62];
v /= 62;
XXXXXX[4] = letters[v % 62];
v /= 62;
XXXXXX[5] = letters[v % 62];
fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, _S_IREAD | _S_IWRITE);
if (fd >= 0)
{
errno = save_errno;
return fd;
}
else if (errno != EEXIST)
return -1;
}
/* We got out of the loop because we ran out of combinations to try. */
errno = EEXIST;
return -1;
}
它将
O_EXCL#define _O_EXCL 0x0400
#define O_EXCL _O_EXCL
您可以轻松地从中删除 mkstemp 支持。
实际上，使用 _mktemp_s() 是一个“非常糟糕”的想法——在任何一个上下文中只有 26 个可能的文件名候选，而且，在这个有限的攻击范围内，它暴露了 mkstemp() 设计的竞争条件克服。然而，另一个提出的解决方案虽然好得多，但也有缺陷，因为它在选择替代文件名字符方面有 62 个自由度，而 Windows 文件系统的不区分大小写消耗了其中的 26 个自由度，因此只留下 36 个自由度。 ;这具有将选择任何逻辑上可区分的字母字符的概率加权为数字的两倍的效果。 考虑到这一点，我在这里发布了一个 MinGW 补丁：
https://sourceforge.net/p/mingw/bugs/2003/如果采用，这将正式将 mkstemp() 和 mkdtemp() 添加到标准 MinGW 发行版中。