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annotate lib/tmpfile-safer.c @ 40057:b06060465f09

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maint: Run 'make update-copyright'
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 01 Jan 2019 00:25:11 +0100
parents 10eb9086bea0
children
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1 /* Invoke tmpfile, but avoid some glitches.
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2 Copyright (C) 2006, 2009-2019 Free Software Foundation, Inc.
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3
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4 This program is free software: you can redistribute it and/or modify
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5 it under the terms of the GNU General Public License as published by
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6 the Free Software Foundation; either version 3 of the License, or
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7 (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public License
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15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
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16
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17 /* Written by Eric Blake, based on ideas from Paul Eggert. */
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19 #include <config.h>
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21 #include "stdio-safer.h"
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23 #include <errno.h>
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24 #include <unistd.h>
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25 #include "unistd-safer.h"
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27 #include "binary-io.h"
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29 /* Like tmpfile, but do not return stdin, stdout, or stderr.
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30
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31 Remember that tmpfile can leave files behind if your program calls _exit,
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32 so this function should not be mixed with the close_stdout module. */
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33
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34 FILE *
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35 tmpfile_safer (void)
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36 {
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37 FILE *fp = tmpfile ();
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38
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39 if (fp)
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40 {
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41 int fd = fileno (fp);
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42
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43 if (0 <= fd && fd <= STDERR_FILENO)
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44 {
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45 int f = dup_safer (fd);
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46
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47 if (f < 0)
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48 {
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49 int e = errno;
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50 fclose (fp);
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51 errno = e;
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52 return NULL;
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53 }
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55 /* Keep the temporary file in binary mode, on platforms
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56 where that matters. */
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57 if (fclose (fp) != 0
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58 || ! (fp = fdopen (f, O_BINARY ? "wb+" : "w+")))
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59 {
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60 int e = errno;
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61 close (f);
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62 errno = e;
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63 return NULL;
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64 }
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65 }
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66 }
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68 return fp;
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69 }