| /* Invoke tmpfile, but avoid some glitches. |
| Copyright (C) 2006, 2009-2020 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; |
| } |