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Diffstat (limited to 'src/libbasic/include/basic/raw-clone.h')
-rw-r--r-- | src/libbasic/include/basic/raw-clone.h | 81 |
1 files changed, 0 insertions, 81 deletions
diff --git a/src/libbasic/include/basic/raw-clone.h b/src/libbasic/include/basic/raw-clone.h deleted file mode 100644 index d473828999..0000000000 --- a/src/libbasic/include/basic/raw-clone.h +++ /dev/null @@ -1,81 +0,0 @@ -#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 -} |