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/* Invoke tmpfile, but avoid some glitches.
Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
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 <https://www.gnu.org/licenses/>. */
/* Written by Eric Blake, based on ideas from Paul Eggert. */
#include <config.h>
#include "stdio-safer.h"
#include <errno.h>
#include <unistd.h>
#include "unistd-safer.h"
#include "binary-io.h"
/* Like tmpfile, but do not return stdin, stdout, or stderr.
Remember that tmpfile can leave files behind if your program calls _exit,
so this function should not be mixed with the close_stdout module. */
FILE *
tmpfile_safer (void)
{
FILE *fp = tmpfile ();
if (fp)
{
int fd = fileno (fp);
if (0 <= fd && fd <= STDERR_FILENO)
{
int f = dup_safer (fd);
if (f < 0)
{
int e = errno;
fclose (fp);
errno = e;
return NULL;
}
/* Keep the temporary file in binary mode, on platforms
where that matters. */
if (fclose (fp) != 0
|| ! (fp = fdopen (f, O_BINARY ? "wb+" : "w+")))
{
int e = errno;
close (f);
errno = e;
return NULL;
}
}
}
return fp;
}
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