/* Copyright (C) 1991,92,93,94,95,96,97,98,99 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#define __PROFTPD_SUPPORT_LIBRARY
#include <conf.h>
#include <libsupp.h>
#ifndef HAVE_MKSTEMP
/* These are the characters used in temporary filenames. */
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. Creates the file and returns a read-write
fd; the file is mode 0600 modulo umask.
We use a clever algorithm to get hard-to-predict names. */
int mkstemp (char *tmpl) {
int len;
char *XXXXXX;
static uint64_t value;
struct timeval tv;
int count, fd;
int save_errno = errno;
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. */
gettimeofday (&tv, NULL);
value += ((uint64_t) tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
for (count = 0; count < TMP_MAX; value += 7777, ++count)
{
uint64_t 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];
/* NOTE: this, or test for _LARGEFILE_SOURCE in order to use the O_LARGEFILE
* open flag
*/
#ifdef _LARGEFILE_SOURCE
fd = open64 (tmp, O_RDWR | O_CREAT | O_EXCL, 0600);
#else
fd = open (tmpl, O_RDWR | O_CREAT | O_EXCL, 0600);
#endif
if (fd >= 0)
{
errno = save_errno;
return fd;
}
else if (errno != EEXIST)
/* Any other error will apply also to other names we might
try, and there are 2^32 or so of them, so give up now. */
return -1;
}
/* We got out of the loop because we ran out of combinations to try. */
errno = EEXIST;
return -1;
}
#else /* HAVE_MKSTEMP */
void
pr_os_already_has_mkstemp(void)
{
}
#endif /* HAVE_MKSTEMP */
Last Updated: Thu Feb 23 11:06:49 2006
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