73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* ABI compatibility for 'fork' symbol in libpthread ABI.
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Copyright (C) 2002-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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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<http://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <shlib-compat.h>
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/* libpthread once had its own fork, though there was no apparent reason
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for it. There is no use in having a separate symbol in libpthread, but
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the historical ABI requires it. For static linking, there is no need to
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provide anything here--the libc version will be linked in. For shared
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library ABI compatibility, there must be __fork and fork symbols in
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libpthread.so; so we define them using IFUNC to redirect to the libc
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function. */
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#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
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# if HAVE_IFUNC
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static __typeof (fork) *
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__attribute__ ((used))
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fork_resolve (void)
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{
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return &__libc_fork;
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}
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# ifdef HAVE_ASM_SET_DIRECTIVE
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# define DEFINE_FORK(name) \
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asm (".set " #name ", fork_resolve\n" \
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".globl " #name "\n" \
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".type " #name ", %gnu_indirect_function");
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# else
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# define DEFINE_FORK(name) \
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asm (#name " = fork_resolve\n" \
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".globl " #name "\n" \
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".type " #name ", %gnu_indirect_function");
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# endif
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# else /* !HAVE_IFUNC */
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static pid_t __attribute__ ((used))
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fork_compat (void)
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{
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return __libc_fork ();
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}
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# define DEFINE_FORK(name) strong_alias (fork_compat, name)
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# endif /* HAVE_IFUNC */
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DEFINE_FORK (fork_ifunc)
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compat_symbol (libpthread, fork_ifunc, fork, GLIBC_2_0);
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DEFINE_FORK (__fork_ifunc)
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compat_symbol (libpthread, __fork_ifunc, __fork, GLIBC_2_0);
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#endif
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