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-#pragma once
-
-/***
- This file is part of systemd.
-
- Copyright 2010 Lennart Poettering
- Copyright 2016 Michael Karcher
- systemd 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.
-
- systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <sched.h>
-#include <sys/syscall.h>
-
-#include "log.h"
-#include "macro.h"
-
-/**
- * raw_clone() - uses clone to create a new process with clone flags
- * @flags: Flags to pass to the clone system call
- *
- * Uses the clone system call to create a new process with the cloning
- * flags and termination signal passed in the flags parameter. Opposed
- * to glibc's clone funtion, using this function does not set up a
- * separate stack for the child, but relies on copy-on-write semantics
- * on the one stack at a common virtual address, just as fork does.
- *
- * To obtain copy-on-write semantics, flags must not contain CLONE_VM,
- * and thus CLONE_THREAD and CLONE_SIGHAND (which require CLONE_VM) are
- * not usabale.
- * Additionally, as this function does not pass the ptid, newtls and ctid
- * parameters to the kernel, flags must not contain CLONE_PARENT_SETTID,
- * CLONE_CHILD_SETTID, CLONE_CHILD_CLEARTID or CLONE_SETTLS.
- *
- * Returns: 0 in the child process and the child process id in the parent.
- */
-static inline int raw_clone(unsigned long flags) {
- assert((flags & (CLONE_VM|CLONE_PARENT_SETTID|CLONE_CHILD_SETTID|
- CLONE_CHILD_CLEARTID|CLONE_SETTLS)) == 0);
-#if defined(__s390__) || defined(__CRIS__)
- /* On s390 and cris the order of the first and second arguments
- * of the raw clone() system call is reversed. */
- return (int) syscall(__NR_clone, NULL, flags);
-#elif defined(__sparc__) && defined(__arch64__)
- {
- /**
- * sparc64 always returns the other process id in %o0, and
- * a boolean flag whether this is the child or the parent in
- * %o1. Inline assembly is needed to get the flag returned
- * in %o1.
- */
- int in_child;
- int child_pid;
- asm volatile("mov %2, %%g1\n\t"
- "mov %3, %%o0\n\t"
- "mov 0 , %%o1\n\t"
- "t 0x6d\n\t"
- "mov %%o1, %0\n\t"
- "mov %%o0, %1" :
- "=r"(in_child), "=r"(child_pid) :
- "i"(__NR_clone), "r"(flags) :
- "%o1", "%o0", "%g1" );
- if (in_child)
- return 0;
- else
- return child_pid;
- }
-#else
- return (int) syscall(__NR_clone, flags, NULL);
-#endif
-}