/* Entering namespaces for test case isolation.
Copyright (C) 2016-2017 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
/* Attempts to become root (or acquire root-like privileges), possibly
with the help of user namespaces. Return true if (restricted) root
privileges could be attained in some way. Print diagnostics to
Note that this function generally has to be called before a process
becomes multi-threaded, otherwise it may fail with insufficient
privileges on systems which would support this operation for
single-threaded processes. */
bool support_become_root (void);
/* Return true if this process can perform a chroot operation. In
general, this is only possible if support_become_root has been
called. Note that the actual test is performed in a subprocess,
after fork, so that the file system root of the original process is
not changed. */
bool support_can_chroot (void);
/* Enter a network namespace (and a UTS namespace if possible) and
configure the loopback interface. Return true if a network
namespace could be created. Print diagnostics to standard output.
If a network namespace could be created, but networking in it could
not be configured, terminate the process. It is recommended to
call support_become_root before this function so that the process
has sufficient privileges. */
bool support_enter_network_namespace (void);
/* Return true if support_enter_network_namespace managed to enter a
UTS namespace. */
bool support_in_uts_namespace (void);
/* Invoke CALLBACK (CLOSURE) in a subprocess created using fork.
Terminate the calling process if the subprocess exits with a
non-zero exit status. */
void support_isolate_in_subprocess (void (*callback) (void *), void *closure);