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aa310ebfba
Casper services expect that the first 3 descriptors (stdin/stdout/stderr) will point to /dev/null. Which Casper will ensure later. The Casper services are forked from the original process. If the initial process closes one of those descriptors, Casper may reuse one of them for it on purpose. If this is the case, then renumarate the descriptors used by Casper to higher numbers. This is done already after the fork, so it doesn't break the parent process. PR: 225343 Reported by: Borja Marcos <borjam (at) sarenet.es> Tested by: jkim@
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2013 The FreeBSD Foundation
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* Copyright (c) 2015 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdlib.h>
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#include "libcasper_impl.h"
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bool
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fd_is_valid(int fd)
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{
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return (fcntl(fd, F_GETFL) != -1 || errno != EBADF);
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}
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void
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fd_fix_environment(int *fdp)
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{
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int nullfd, nfd;
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if (*fdp > STDERR_FILENO)
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return;
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nullfd = open(_PATH_DEVNULL, O_RDWR);
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if (nullfd == -1)
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errx(1, "Unable to open %s", _PATH_DEVNULL);
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while (*fdp <= STDERR_FILENO) {
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nfd = dup(*fdp);
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if (nfd == -1)
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errx(1, "Unable to secure fd");
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if (dup2(nullfd, *fdp) == -1)
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errx(1, "Unable to secure fd");
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*fdp = nfd;
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}
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close(nullfd);
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}
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