mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-13 14:50:17 +00:00
88758c4ad3
Unlike the vfork forwarder and like the fork forwarder as in bug 19861,
there won't be a problem when the compiler does not turn this into a tail
call.
(cherry picked from commit fc5ad7024c)
50 lines
2.0 KiB
C
50 lines
2.0 KiB
C
/* ABI compatibility for 'longjmp' and 'siglongjmp' symbols in libpthread ABI.
|
|
Copyright (C) 2002-2017 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 <setjmp.h>
|
|
#include <shlib-compat.h>
|
|
|
|
/* libpthread once had its own longjmp (and siglongjmp alias), 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
|
|
longjmp and siglongjmp symbols in libpthread.so.
|
|
|
|
With an IFUNC resolver, it would be possible to avoid the indirection,
|
|
but the IFUNC resolver might run before the __libc_longjmp symbol has
|
|
been relocated, in which case the IFUNC resolver would not be able to
|
|
provide the correct address. */
|
|
|
|
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
|
|
|
|
static void __attribute__ ((noreturn, used))
|
|
longjmp_compat (jmp_buf env, int val)
|
|
{
|
|
__libc_longjmp (env, val);
|
|
}
|
|
|
|
strong_alias (longjmp_compat, longjmp_alias)
|
|
compat_symbol (libpthread, longjmp_alias, longjmp, GLIBC_2_0);
|
|
|
|
strong_alias (longjmp_alias, siglongjmp_alias)
|
|
compat_symbol (libpthread, siglongjmp_alias, siglongjmp, GLIBC_2_0);
|
|
|
|
#endif
|