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f06f3f05b4
This commit only addresses the fork case, the vfork case has to be a tail call, which is why the generic code needs an IFUNC resolver there.
50 lines
1.9 KiB
C
50 lines
1.9 KiB
C
/* ABI compatibility for 'fork' symbol in libpthread ABI.
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Copyright (C) 2002-2016 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.
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With an IFUNC resolver, it would be possible to avoid the
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indirection, but the IFUNC resolver might run before the
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__libc_fork symbol has been relocated, in which case the IFUNC
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resolver would not be able to provide the correct address. */
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#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
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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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strong_alias (fork_compat, fork_alias)
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compat_symbol (libpthread, fork_alias, fork, GLIBC_2_0);
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strong_alias (fork_compat, __fork_alias)
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compat_symbol (libpthread, __fork_alias, __fork, GLIBC_2_0);
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#endif
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