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/* Auxiliary functions to issue the clone syscall.
Copyright (C) 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/>. */
#ifdef __linux__
# include <support/check.h>
# include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
# include <xsched.h>
pid_t
xclone (int (*fn) (void *arg), void *arg, void *stack, size_t stack_size,
int flags)
{
pid_t r = -1;
# ifdef __ia64__
extern int __clone2 (int (*fn) (void *arg), void *stack, size_t stack_size,
int flags, void *arg, ...);
r = __clone2 (fn, stack, stack_size, flags, arg, /* ptid */ NULL,
/* tls */ NULL, /* ctid */ NULL);
# else
# if _STACK_GROWS_DOWN
r = clone (fn, stack + stack_size, flags, arg, /* ptid */ NULL,
/* tls */ NULL, /* ctid */ NULL);
# elif _STACK_GROWS_UP
r = clone (fn, stack, flags, arg, /* ptid */ NULL, /* tls */ NULL, NULL);
# endif
# endif
if (r < 0)
FAIL_EXIT1 ("clone: %m");
return r;
}
#endif
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