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/* ABI compatibility for 'system' symbol in libpthread ABI.
Copyright (C) 2002-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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
<http://www.gnu.org/licenses/>. */
#include <stdlib.h>
#include <shlib-compat.h>
/* libpthread once had its own 'system', though there was no apparent
reason for it. There is no use in having a separate symbol in
libpthread, but the historical ABI requires it. For static linking,
there is no need to provide anything here--the libc version will be
linked in. For shared library ABI compatibility, there must be a
'system' symbol in libpthread.so; so we define it using IFUNC to
redirect to the libc function. */
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
# if HAVE_IFUNC
static __typeof (system) *
__attribute__ ((used))
system_resolve (void)
{
return &__libc_system;
}
asm (".globl system_ifunc\n"
".type system_ifunc, %gnu_indirect_function");
# ifdef HAVE_ASM_SET_DIRECTIVE
asm (".set system_ifunc, system_resolve");
# else
asm ("system_ifunc = system_resolve");
# endif
# else /* !HAVE_IFUNC */
static int __attribute__ ((used))
system_compat (const char *line)
{
return __libc_system (line);
}
strong_alias (system_compat, system_ifunc)
# endif /* HAVE_IFUNC */
compat_symbol (libpthread, system_ifunc, system, GLIBC_2_0);
#endif
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