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annotate lib/pipe-safer.c @ 18079:4c948fd76734 default tip master

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author Karl Berry <karl@freefriends.org>
date Mon, 24 Aug 2015 06:09:19 -0700
parents ab58d4870664
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1 /* Invoke pipe, but avoid some glitches.
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2 Copyright (C) 2005-2006, 2009-2015 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 <http://www.gnu.org/licenses/>. */
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16
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17 /* Written by Jim Meyering. */
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18
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19 #include <config.h>
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20
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21 #include "unistd-safer.h"
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22
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23 #include <unistd.h>
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24 #include <errno.h>
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25
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26 /* Like pipe, but ensure that neither of the file descriptors is
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27 STDIN_FILENO, STDOUT_FILENO, or STDERR_FILENO. Fail with ENOSYS on
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28 platforms that lack pipe. */
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29
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30 int
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31 pipe_safer (int fd[2])
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32 {
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33 #if HAVE_PIPE
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34 if (pipe (fd) == 0)
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35 {
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36 int i;
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37 for (i = 0; i < 2; i++)
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38 {
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39 fd[i] = fd_safer (fd[i]);
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40 if (fd[i] < 0)
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41 {
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42 int e = errno;
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43 close (fd[1 - i]);
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44 errno = e;
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45 return -1;
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46 }
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47 }
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48
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49 return 0;
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50 }
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51 #else
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52 errno = ENOSYS;
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53 #endif
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54
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55 return -1;
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56 }