mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* 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
|