mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
581c785bf3
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 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
92 lines
3.3 KiB
C
92 lines
3.3 KiB
C
/* The internal wrapper of clone and clone3.
|
|
Copyright (C) 2021-2022 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 <sysdep.h>
|
|
#include <stddef.h>
|
|
#include <errno.h>
|
|
#include <sched.h>
|
|
#include <clone_internal.h>
|
|
#include <libc-pointer-arith.h> /* For cast_to_pointer. */
|
|
#include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
|
|
|
|
#define CLONE_ARGS_SIZE_VER0 64 /* sizeof first published struct */
|
|
#define CLONE_ARGS_SIZE_VER1 80 /* sizeof second published struct */
|
|
#define CLONE_ARGS_SIZE_VER2 88 /* sizeof third published struct */
|
|
|
|
#define sizeof_field(TYPE, MEMBER) sizeof ((((TYPE *)0)->MEMBER))
|
|
#define offsetofend(TYPE, MEMBER) \
|
|
(offsetof (TYPE, MEMBER) + sizeof_field (TYPE, MEMBER))
|
|
|
|
_Static_assert (__alignof (struct clone_args) == 8,
|
|
"__alignof (struct clone_args) != 8");
|
|
_Static_assert (offsetofend (struct clone_args, tls) == CLONE_ARGS_SIZE_VER0,
|
|
"offsetofend (struct clone_args, tls) != CLONE_ARGS_SIZE_VER0");
|
|
_Static_assert (offsetofend (struct clone_args, set_tid_size) == CLONE_ARGS_SIZE_VER1,
|
|
"offsetofend (struct clone_args, set_tid_size) != CLONE_ARGS_SIZE_VER1");
|
|
_Static_assert (offsetofend (struct clone_args, cgroup) == CLONE_ARGS_SIZE_VER2,
|
|
"offsetofend (struct clone_args, cgroup) != CLONE_ARGS_SIZE_VER2");
|
|
_Static_assert (sizeof (struct clone_args) == CLONE_ARGS_SIZE_VER2,
|
|
"sizeof (struct clone_args) != CLONE_ARGS_SIZE_VER2");
|
|
|
|
int
|
|
__clone_internal (struct clone_args *cl_args,
|
|
int (*func) (void *arg), void *arg)
|
|
{
|
|
int ret;
|
|
#ifdef HAVE_CLONE3_WRAPPER
|
|
/* Try clone3 first. */
|
|
int saved_errno = errno;
|
|
ret = __clone3 (cl_args, sizeof (*cl_args), func, arg);
|
|
if (ret != -1 || errno != ENOSYS)
|
|
return ret;
|
|
|
|
/* NB: Restore errno since errno may be checked against non-zero
|
|
return value. */
|
|
__set_errno (saved_errno);
|
|
#endif
|
|
|
|
/* Map clone3 arguments to clone arguments. NB: No need to check
|
|
invalid clone3 specific bits in flags nor exit_signal since this
|
|
is an internal function. */
|
|
int flags = cl_args->flags | cl_args->exit_signal;
|
|
void *stack = cast_to_pointer (cl_args->stack);
|
|
|
|
#ifdef __ia64__
|
|
ret = __clone2 (func, stack, cl_args->stack_size,
|
|
flags, arg,
|
|
cast_to_pointer (cl_args->parent_tid),
|
|
cast_to_pointer (cl_args->tls),
|
|
cast_to_pointer (cl_args->child_tid));
|
|
#else
|
|
# if !_STACK_GROWS_DOWN && !_STACK_GROWS_UP
|
|
# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
|
|
# endif
|
|
|
|
# if _STACK_GROWS_DOWN
|
|
stack += cl_args->stack_size;
|
|
# endif
|
|
ret = __clone (func, stack, flags, arg,
|
|
cast_to_pointer (cl_args->parent_tid),
|
|
cast_to_pointer (cl_args->tls),
|
|
cast_to_pointer (cl_args->child_tid));
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
libc_hidden_def (__clone_internal)
|