Re: [PATCH 5/7] sysvipc: Split out linux struct shmid_ds

[Alistair Francis <alistair23@gmail.com>]

On Tue, Jun 30, 2020 at 12:27 PM Adhemerval Zanella via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> This will allow us to have architectures specify their own version.
>
> Not semantic changes expected.  Checked with a build against the
> all affected ABIs.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

> ---
>  sysdeps/unix/sysv/linux/Makefile              |  1 +
>  sysdeps/unix/sysv/linux/bits/shm.h            | 34 +----------
>  .../sysv/linux/bits/types/struct_shmid_ds.h   | 57 +++++++++++++++++++
>  3 files changed, 59 insertions(+), 33 deletions(-)
>  create mode 100644 sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
>
> diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile
> index 505087e617..bdd187af73 100644
> --- a/sysdeps/unix/sysv/linux/Makefile
> +++ b/sysdeps/unix/sysv/linux/Makefile
> @@ -93,6 +93,7 @@ sysdep_headers += sys/mount.h sys/acct.h \
>                   bits/termios-misc.h \
>                   bits/types/struct_semid_ds.h \
>                   bits/types/struct_msqid_ds.h \
> +                 bits/types/struct_shmid_ds.h \
>                   bits/ipc-perm.h
>
>  tests += tst-clone tst-clone2 tst-clone3 tst-fanotify tst-personality \
> diff --git a/sysdeps/unix/sysv/linux/bits/shm.h b/sysdeps/unix/sysv/linux/bits/shm.h
> index 113c05ee89..9ef6aeaf92 100644
> --- a/sysdeps/unix/sysv/linux/bits/shm.h
> +++ b/sysdeps/unix/sysv/linux/bits/shm.h
> @@ -43,39 +43,7 @@ __BEGIN_DECLS
>  /* Type to count number of attaches.  */
>  typedef __syscall_ulong_t shmatt_t;
>
> -#if __SHM_PAD_BEFORE_TIME
> -# define __SHM_PAD_TIME(NAME, RES)                             \
> -  unsigned long int __glibc_reserved ## RES; __time_t NAME
> -#elif __SHM_PAD_AFTER_TIME
> -# define __SHM_PAD_TIME(NAME, RES)                             \
> -  __time_t NAME; unsigned long int __glibc_reserved ## RES
> -#else
> -# define __SHM_PAD_TIME(NAME, RES)             \
> -  __time_t NAME
> -#endif
> -
> -/* Data structure describing a shared memory segment.  */
> -struct shmid_ds
> -  {
> -    struct ipc_perm shm_perm;          /* operation permission struct */
> -#if !__SHM_SEGSZ_AFTER_TIME
> -    size_t shm_segsz;                  /* size of segment in bytes */
> -#endif
> -    __SHM_PAD_TIME (shm_atime, 1);     /* time of last shmat() */
> -    __SHM_PAD_TIME (shm_dtime, 2);     /* time of last shmdt() */
> -    __SHM_PAD_TIME (shm_ctime, 3);     /* time of last change by shmctl() */
> -#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
> -    unsigned long int __glibc_reserved4;
> -#endif
> -#if __SHM_SEGSZ_AFTER_TIME
> -    size_t shm_segsz;                  /* size of segment in bytes */
> -#endif
> -    __pid_t shm_cpid;                  /* pid of creator */
> -    __pid_t shm_lpid;                  /* pid of last shmop */
> -    shmatt_t shm_nattch;               /* number of current attaches */
> -    __syscall_ulong_t __glibc_reserved5;
> -    __syscall_ulong_t __glibc_reserved6;
> -  };
> +#include <bits/types/struct_shmid_ds.h>
>
>  #ifdef __USE_MISC
>
> diff --git a/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
> new file mode 100644
> index 0000000000..938bbedfcd
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/bits/types/struct_shmid_ds.h
> @@ -0,0 +1,57 @@
> +/* Generic implementation of the shared memory struct shmid_ds.
> +   Copyright (C) 2020 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   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
> +   <https://www.gnu.org/licenses/>.  */
> +
> +#ifndef _SYS_SHM_H
> +# error "Never include <bits/types/struct_shmid_ds.h> directly; use <sys/shm.h> instead."
> +#endif
> +
> +#include <bits/shm-pad.h>
> +
> +#if __SHM_PAD_BEFORE_TIME
> +# define __SHM_PAD_TIME(NAME, RES)                             \
> +  unsigned long int __glibc_reserved ## RES; __time_t NAME
> +#elif __SHM_PAD_AFTER_TIME
> +# define __SHM_PAD_TIME(NAME, RES)                             \
> +  __time_t NAME; unsigned long int __glibc_reserved ## RES
> +#else
> +# define __SHM_PAD_TIME(NAME, RES)             \
> +  __time_t NAME
> +#endif
> +
> +/* Data structure describing a shared memory segment.  */
> +struct shmid_ds
> +  {
> +    struct ipc_perm shm_perm;          /* operation permission struct */
> +#if !__SHM_SEGSZ_AFTER_TIME
> +    size_t shm_segsz;                  /* size of segment in bytes */
> +#endif
> +    __SHM_PAD_TIME (shm_atime, 1);     /* time of last shmat() */
> +    __SHM_PAD_TIME (shm_dtime, 2);     /* time of last shmdt() */
> +    __SHM_PAD_TIME (shm_ctime, 3);     /* time of last change by shmctl() */
> +#if __SHM_PAD_BETWEEN_TIME_AND_SEGSZ
> +    unsigned long int __glibc_reserved4;
> +#endif
> +#if __SHM_SEGSZ_AFTER_TIME
> +    size_t shm_segsz;                  /* size of segment in bytes */
> +#endif
> +    __pid_t shm_cpid;                  /* pid of creator */
> +    __pid_t shm_lpid;                  /* pid of last shmop */
> +    shmatt_t shm_nattch;               /* number of current attaches */
> +    __syscall_ulong_t __glibc_reserved5;
> +    __syscall_ulong_t __glibc_reserved6;
> +  };
> --
> 2.25.1
>