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Clean up NPTL fork to be compat-only.

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This commit is contained in:
Roland McGrath 2015-02-06 10:53:07 -08:00
parent ea02c6b812
commit beff1d132c
3 changed files with 57 additions and 4 deletions
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5
ChangeLog
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@ -1,5 +1,10 @@
2015-02-06 Roland McGrath <roland@hack.frob.com>
* nptl/pt-fork.c: Rewritten. Put everything under
[SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)].
Use IFUNC to redirect when possible.
* nptl/Versions (libpthread: GLIBC_2.22): New (empty) version set.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S: Remove all
code under [!__ASSUME_FUTEX_CLOCK_REALTIME], since that is defined
unconditionally nowadays. This included the only reference to

3
nptl/Versions
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@ -266,6 +266,9 @@ libpthread {
GLIBC_2.20 {
}
GLIBC_2.22 {
}
GLIBC_PRIVATE {
__pthread_initialize_minimal;
__pthread_clock_gettime; __pthread_clock_settime;

53
nptl/pt-fork.c
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@ -1,4 +1,5 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
/* 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.
@ -17,11 +18,55 @@
<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. */
pid_t
__fork (void)
#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 ();
}
strong_alias (__fork, 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