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70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
/* Invoke tmpfile, but avoid some glitches.
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Copyright (C) 2006, 2009-2021 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Eric Blake, based on ideas from Paul Eggert. */
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#include <config.h>
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#include "stdio-safer.h"
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#include <errno.h>
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#include <unistd.h>
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#include "unistd-safer.h"
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#include "binary-io.h"
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/* Like tmpfile, but do not return stdin, stdout, or stderr.
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Remember that tmpfile can leave files behind if your program calls _exit,
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so this function should not be mixed with the close_stdout module. */
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FILE *
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tmpfile_safer (void)
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{
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FILE *fp = tmpfile ();
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if (fp)
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{
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int fd = fileno (fp);
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if (0 <= fd && fd <= STDERR_FILENO)
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{
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int f = dup_safer (fd);
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if (f < 0)
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{
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int e = errno;
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fclose (fp);
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errno = e;
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return NULL;
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}
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/* Keep the temporary file in binary mode, on platforms
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where that matters. */
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if (fclose (fp) != 0
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|| ! (fp = fdopen (f, O_BINARY ? "wb+" : "w+")))
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{
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int e = errno;
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close (f);
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errno = e;
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return NULL;
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}
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}
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}
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return fp;
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}
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