diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | nptl/Versions | 3 | ||||
| -rw-r--r-- | nptl/pt-fork.c | 53 |
3 files changed, 57 insertions, 4 deletions
@@ -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 diff --git a/nptl/Versions b/nptl/Versions index 4e134fa..bc8a15b 100644 --- a/nptl/Versions +++ b/nptl/Versions @@ -266,6 +266,9 @@ libpthread { GLIBC_2.20 { } + GLIBC_2.22 { + } + GLIBC_PRIVATE { __pthread_initialize_minimal; __pthread_clock_gettime; __pthread_clock_settime; diff --git a/nptl/pt-fork.c b/nptl/pt-fork.c index ea9e876..fd6544b 100644 --- a/nptl/pt-fork.c +++ b/nptl/pt-fork.c @@ -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 |