glibc/support/support_can_chroot.c
Paul Eggert 2b778ceb40 Update copyright dates with scripts/update-copyrights
I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
2021-01-02 12:17:34 -08:00

66 lines
1.8 KiB
C

/* Return true if the process can perform a chroot operation.
Copyright (C) 2017-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <support/check.h>
#include <support/namespace.h>
#include <support/support.h>
#include <support/xunistd.h>
#include <sys/stat.h>
#include <unistd.h>
static void
callback (void *closure)
{
int *result = closure;
struct stat64 before;
xstat ("/dev", &before);
if (chroot ("/dev") != 0)
{
*result = errno;
return;
}
struct stat64 after;
xstat ("/", &after);
TEST_VERIFY (before.st_dev == after.st_dev);
TEST_VERIFY (before.st_ino == after.st_ino);
*result = 0;
}
bool
support_can_chroot (void)
{
int *result = support_shared_allocate (sizeof (*result));
*result = 0;
support_isolate_in_subprocess (callback, result);
bool ok = *result == 0;
if (!ok)
{
static bool already_warned;
if (!already_warned)
{
already_warned = true;
errno = *result;
printf ("warning: this process does not support chroot: %m\n");
}
}
support_shared_free (result);
return ok;
}