mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/* ABI compatibility for 'fork' symbol in libpthread ABI.
|
|
Copyright (C) 2002-2015 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 <unistd.h>
|
|
#include <shlib-compat.h>
|
|
|
|
/* libpthread once had its own fork, 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 __fork and fork symbols in
|
|
libpthread.so; so we define them using IFUNC to redirect to the libc
|
|
function. */
|
|
|
|
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
|
|
|
|
# if HAVE_IFUNC
|
|
|
|
static __typeof (fork) *
|
|
__attribute__ ((used))
|
|
fork_resolve (void)
|
|
{
|
|
return &__libc_fork;
|
|
}
|
|
|
|
# ifdef HAVE_ASM_SET_DIRECTIVE
|
|
# define DEFINE_FORK(name) \
|
|
asm (".set " #name ", fork_resolve\n" \
|
|
".globl " #name "\n" \
|
|
".type " #name ", %gnu_indirect_function");
|
|
# else
|
|
# define DEFINE_FORK(name) \
|
|
asm (#name " = fork_resolve\n" \
|
|
".globl " #name "\n" \
|
|
".type " #name ", %gnu_indirect_function");
|
|
# endif
|
|
|
|
# else /* !HAVE_IFUNC */
|
|
|
|
static pid_t __attribute__ ((used))
|
|
fork_compat (void)
|
|
{
|
|
return __libc_fork ();
|
|
}
|
|
|
|
# define DEFINE_FORK(name) strong_alias (fork_compat, name)
|
|
|
|
# endif /* HAVE_IFUNC */
|
|
|
|
DEFINE_FORK (fork_ifunc)
|
|
compat_symbol (libpthread, fork_ifunc, fork, GLIBC_2_0);
|
|
|
|
DEFINE_FORK (__fork_ifunc)
|
|
compat_symbol (libpthread, __fork_ifunc, __fork, GLIBC_2_0);
|
|
|
|
#endif
|