65 lines
2 KiB
C
65 lines
2 KiB
C
/* ABI compatibility for 'system' 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 <stdlib.h>
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#include <shlib-compat.h>
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/* libpthread once had its own 'system', though there was no apparent
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reason for it. There is no use in having a separate symbol in
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libpthread, but the historical ABI requires it. For static linking,
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there is no need to provide anything here--the libc version will be
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linked in. For shared library ABI compatibility, there must be a
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'system' symbol in libpthread.so; so we define it using IFUNC to
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redirect to the libc 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 (system) *
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__attribute__ ((used))
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system_resolve (void)
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{
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return &__libc_system;
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}
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asm (".globl system_ifunc\n"
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".type system_ifunc, %gnu_indirect_function");
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# ifdef HAVE_ASM_SET_DIRECTIVE
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asm (".set system_ifunc, system_resolve");
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# else
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asm ("system_ifunc = system_resolve");
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# endif
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# else /* !HAVE_IFUNC */
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static int __attribute__ ((used))
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system_compat (const char *line)
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{
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return __libc_system (line);
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}
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strong_alias (system_compat, system_ifunc)
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# endif /* HAVE_IFUNC */
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compat_symbol (libpthread, system_ifunc, system, GLIBC_2_0);
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#endif
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