[PATCH 0/5] Thread-specific file system attributes and credentials

[enh]

does it make sense to have multiple functions (as here), or would
generic functions with multiple arguments make more sense? (it's a lot
less boilerplate if nothing else.)

On Tue, Dec 9, 2025 at 12:30 PM Florian Weimer <fweimer@redhat.com> wrote:
>
> This functionality is already in use via unshare or direct system calls
> in file servers such as Samba and nfs-ganesha.  I think it makes sense
> to provide a glibc implementation, to document that this is a supported
> scenario.
>
> This is a repost of a very old patch series.
>
> Thanks,
> Florian
>
> Florian Weimer (5):
>   support: Add xfchdir
>   support: Add xgetresgid and xgetresuid
>   Linux: Implement per-thread file system attributes
>   Linux: Implement per-thread user and group IDs
>   nptl: Add test nptl/tst-pthread-perthread-inherit
>
>  NEWS                                          |  10 +
>  manual/threads.texi                           | 148 +++++
>  nptl/Makefile                                 |  10 +
>  nptl/Versions                                 |   4 +
>  nptl/nptl_setxid.c                            |  20 +-
>  nptl/pthread_attr_getperthreadfs_np.c         |  32 ++
>  nptl/pthread_attr_getperthreadids_np.c        |  32 ++
>  nptl/pthread_attr_setperthreadfs_np.c         |  39 ++
>  nptl/pthread_attr_setperthreadids_np.c        |  39 ++
>  nptl/pthread_create.c                         |  20 +-
>  nptl/tst-pthread-perthread-inherit.c          | 220 +++++++
>  nptl/tst-pthread-perthreadfs-chroot.c         | 255 +++++++++
>  nptl/tst-pthread-perthreadfs.c                | 322 +++++++++++
>  nptl/tst-pthread-perthreadids.c               | 541 ++++++++++++++++++
>  support/Makefile                              |   3 +
>  support/xfchdir.c                             |  28 +
>  support/xgetresgid.c                          |  27 +
>  support/xgetresuid.c                          |  27 +
>  support/xunistd.h                             |   4 +
>  sysdeps/nptl/internaltypes.h                  |  13 +
>  sysdeps/nptl/pthread.h                        |  44 +-
>  sysdeps/nptl/pthreadP.h                       |   8 +
>  sysdeps/nptl/setxid.h                         |   2 +-
>  sysdeps/unix/sysv/linux/aarch64/libc.abilist  |   4 +
>  sysdeps/unix/sysv/linux/alpha/libc.abilist    |   4 +
>  sysdeps/unix/sysv/linux/arc/libc.abilist      |   4 +
>  sysdeps/unix/sysv/linux/arm/be/libc.abilist   |   4 +
>  sysdeps/unix/sysv/linux/arm/le/libc.abilist   |   4 +
>  sysdeps/unix/sysv/linux/csky/libc.abilist     |   4 +
>  sysdeps/unix/sysv/linux/hppa/libc.abilist     |   4 +
>  sysdeps/unix/sysv/linux/i386/libc.abilist     |   4 +
>  .../sysv/linux/loongarch/lp64/libc.abilist    |   4 +
>  .../sysv/linux/m68k/coldfire/libc.abilist     |   4 +
>  .../unix/sysv/linux/m68k/m680x0/libc.abilist  |   4 +
>  .../sysv/linux/microblaze/be/libc.abilist     |   4 +
>  .../sysv/linux/microblaze/le/libc.abilist     |   4 +
>  .../sysv/linux/mips/mips32/fpu/libc.abilist   |   4 +
>  .../sysv/linux/mips/mips32/nofpu/libc.abilist |   4 +
>  .../sysv/linux/mips/mips64/n32/libc.abilist   |   4 +
>  .../sysv/linux/mips/mips64/n64/libc.abilist   |   4 +
>  sysdeps/unix/sysv/linux/or1k/libc.abilist     |   4 +
>  .../linux/powerpc/powerpc32/fpu/libc.abilist  |   4 +
>  .../powerpc/powerpc32/nofpu/libc.abilist      |   4 +
>  .../linux/powerpc/powerpc64/be/libc.abilist   |   4 +
>  .../linux/powerpc/powerpc64/le/libc.abilist   |   4 +
>  .../unix/sysv/linux/riscv/rv32/libc.abilist   |   4 +
>  .../unix/sysv/linux/riscv/rv64/libc.abilist   |   4 +
>  .../unix/sysv/linux/s390/s390-32/libc.abilist |   4 +
>  .../unix/sysv/linux/s390/s390-64/libc.abilist |   4 +
>  sysdeps/unix/sysv/linux/sh/be/libc.abilist    |   4 +
>  sysdeps/unix/sysv/linux/sh/le/libc.abilist    |   4 +
>  .../sysv/linux/sparc/sparc32/libc.abilist     |   4 +
>  .../sysv/linux/sparc/sparc64/libc.abilist     |   4 +
>  .../unix/sysv/linux/x86_64/64/libc.abilist    |   4 +
>  .../unix/sysv/linux/x86_64/x32/libc.abilist   |   4 +
>  55 files changed, 1960 insertions(+), 16 deletions(-)
>  create mode 100644 nptl/pthread_attr_getperthreadfs_np.c
>  create mode 100644 nptl/pthread_attr_getperthreadids_np.c
>  create mode 100644 nptl/pthread_attr_setperthreadfs_np.c
>  create mode 100644 nptl/pthread_attr_setperthreadids_np.c
>  create mode 100644 nptl/tst-pthread-perthread-inherit.c
>  create mode 100644 nptl/tst-pthread-perthreadfs-chroot.c
>  create mode 100644 nptl/tst-pthread-perthreadfs.c
>  create mode 100644 nptl/tst-pthread-perthreadids.c
>  create mode 100644 support/xfchdir.c
>  create mode 100644 support/xgetresgid.c
>  create mode 100644 support/xgetresuid.c
>
>
> base-commit: 0f0a5cd338998f4b603f52f3ce2163df0db7b814
> --
> 2.52.0
>