[v4,0/4] Add _Fork implementation

  Austin Group issue 62 [1] dropped the async-signal-safe requirement 
for fork and provided a async-signal-safe _Fork replacement that 
does not run the atfork handlers.  It will be included in the next 
POSIX standard.                         
                                                
It allow close a long standing issue that ask fork to be AS-safe
(BZ#4737) now that we provide a similar call. 

The first patch consolidates the fork implementation between Linux
and Hurd, moving the arch-specifics bits to the system specific
fork.h header.  The process spawn core is moved to the internal
symbol _Fork, which will be exported in the final patch.

Second patch a minor issue with atfork handler.

Third patch consolidates the pthread_atfork implementation over
Linux and Hurd.

The final patch exports the new _Fork symbol and add some regression
tests.

*** BLURB HERE ***

Adhemerval Zanella (4):
  posix: Consolidate fork implementation
  posix: Do not clobber errno by atfork handlers
  Consolidate pthread_atfork
  posix: Add _Fork [BZ #4737]

 NEWS                                          |   8 +
 htl/Makefile                                  |   4 +-
 include/unistd.h                              |   4 +
 malloc/Makefile                               |   3 +
 malloc/tst-mallocfork3.c                      | 213 ++++++++++++++
 manual/process.texi                           |  39 ++-
 nptl/Makefile                                 |   1 -
 posix/Makefile                                |   6 +-
 posix/Versions                                |   1 +
 posix/_Fork.c                                 |  34 +++
 posix/fork.c                                  | 124 +++++++-
 posix/tst-_Fork.c                             | 218 +++++++++++++++
 posix/unistd.h                                |   7 +
 .../{htl/old_pt-atfork.c => generic/fork.h}   |  26 +-
 sysdeps/htl/pt-atfork.c                       |  41 ---
 sysdeps/htl/pthread_atfork_compat.h           |   4 +
 sysdeps/mach/hurd/{fork.c => _Fork.c}         |  21 +-
 sysdeps/nptl/_Fork.c                          |  52 ++++
 sysdeps/nptl/fork.c                           | 264 ------------------
 sysdeps/nptl/fork.h                           | 148 ++++++++++
 sysdeps/nptl/pthread_atfork_compat.h          |   4 +
 sysdeps/pthread/Makefile                      |   4 +-
 {nptl => sysdeps/pthread}/pthread_atfork.c    |   1 +
 .../pthread/pthread_atfork_compat.c           |   8 +-
 sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   1 +
 sysdeps/unix/sysv/linux/alpha/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/arc/libc.abilist      |   1 +
 sysdeps/unix/sysv/linux/arch-fork.h           |   3 +
 sysdeps/unix/sysv/linux/arm/be/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/arm/le/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/csky/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/hppa/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/i386/libc.abilist     |   1 +
 sysdeps/unix/sysv/linux/ia64/libc.abilist     |   1 +
 .../sysv/linux/m68k/coldfire/libc.abilist     |   1 +
 .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   1 +
 .../sysv/linux/microblaze/be/libc.abilist     |   1 +
 .../sysv/linux/microblaze/le/libc.abilist     |   1 +
 .../sysv/linux/mips/mips32/fpu/libc.abilist   |   1 +
 .../sysv/linux/mips/mips32/nofpu/libc.abilist |   1 +
 .../sysv/linux/mips/mips64/n32/libc.abilist   |   1 +
 .../sysv/linux/mips/mips64/n64/libc.abilist   |   1 +
 sysdeps/unix/sysv/linux/nios2/libc.abilist    |   1 +
 .../linux/powerpc/powerpc32/fpu/libc.abilist  |   1 +
 .../powerpc/powerpc32/nofpu/libc.abilist      |   1 +
 .../linux/powerpc/powerpc64/be/libc.abilist   |   1 +
 .../linux/powerpc/powerpc64/le/libc.abilist   |   1 +
 .../unix/sysv/linux/riscv/rv32/libc.abilist   |   1 +
 .../unix/sysv/linux/riscv/rv64/libc.abilist   |   1 +
 .../unix/sysv/linux/s390/s390-32/libc.abilist |   1 +
 .../unix/sysv/linux/s390/s390-64/libc.abilist |   1 +
 sysdeps/unix/sysv/linux/sh/be/libc.abilist    |   1 +
 sysdeps/unix/sysv/linux/sh/le/libc.abilist    |   1 +
 .../sysv/linux/sparc/sparc32/libc.abilist     |   1 +
 .../sysv/linux/sparc/sparc64/libc.abilist     |   1 +
 .../unix/sysv/linux/x86_64/64/libc.abilist    |   1 +
 .../unix/sysv/linux/x86_64/x32/libc.abilist   |   1 +
 57 files changed, 898 insertions(+), 372 deletions(-)
 create mode 100644 malloc/tst-mallocfork3.c
 create mode 100644 posix/_Fork.c
 create mode 100644 posix/tst-_Fork.c
 rename sysdeps/{htl/old_pt-atfork.c => generic/fork.h} (61%)
 delete mode 100644 sysdeps/htl/pt-atfork.c
 create mode 100644 sysdeps/htl/pthread_atfork_compat.h
 rename sysdeps/mach/hurd/{fork.c => _Fork.c} (98%)
 create mode 100644 sysdeps/nptl/_Fork.c
 delete mode 100644 sysdeps/nptl/fork.c
 create mode 100644 sysdeps/nptl/fork.h
 create mode 100644 sysdeps/nptl/pthread_atfork_compat.h
 rename {nptl => sysdeps/pthread}/pthread_atfork.c (98%)
 rename nptl/old_pthread_atfork.c => sysdeps/pthread/pthread_atfork_compat.c (84%)