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de8995a2a0
It is a wrapper for Linux clone syscall, to simplify the call to the use only the most common arguments and remove architecture specific handling (such as ia64 different name and signature).
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Auxiliary functions to issue the clone syscall.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifdef __linux__
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# include <support/check.h>
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# include <stackinfo.h> /* For _STACK_GROWS_{UP,DOWN}. */
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# include <xsched.h>
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pid_t
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xclone (int (*fn) (void *arg), void *arg, void *stack, size_t stack_size,
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int flags)
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{
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pid_t r = -1;
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# ifdef __ia64__
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extern int __clone2 (int (*fn) (void *arg), void *stack, size_t stack_size,
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int flags, void *arg, ...);
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r = __clone2 (f, stack, stack_size, flags, arg, /* ptid */ NULL,
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/* tls */ NULL, /* ctid */ ctid);
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# else
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# if _STACK_GROWS_DOWN
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r = clone (fn, stack + stack_size, flags, arg, /* ptid */ NULL,
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/* tls */ NULL, /* ctid */ NULL);
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# elif _STACK_GROWS_UP
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r = clone (fn, stack, flags, arg, /* ptid */ NULL, /* tls */ NULL,
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&ctid);
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# endif
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# endif
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if (r < 0)
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FAIL_EXIT1 ("clone: %m");
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return r;
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}
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#endif
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