[PATCH 15/30] Linux: consolidate sendfile implementation
Carlos O'Donell
carlos@redhat.com
Mon Dec 5 16:39:47 GMT 2022
On 10/19/22 18:14, Adhemerval Zanella via Libc-alpha wrote:
> This is similar to other LFS consolidation, where the non-LFS is only
> built if __OFF_T_MATCHES_OFF64_T is not defined and the LFS version
> is aliased to non-LFS name if __OFF_T_MATCHES_OFF64_T is defined.
>
> For non-LFS variant, use sendfile syscall if defined, otherwise use
> sendfile64 plus the offset overflow check (as generic implementation).
LGTM.
No regressions on x86_64 and i686.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
>
> Checked on x86_64-linux-gnu.
> ---
> .../sysv/linux/mips/mips64/n64/sendfile64.c | 1 -
> .../sysv/linux/mips/mips64/n64/syscalls.list | 3 --
> .../{generic/wordsize-32 => }/sendfile.c | 15 ++++++--
> sysdeps/unix/sysv/linux/sendfile64.c | 37 +++++++++++++++++++
> sysdeps/unix/sysv/linux/syscalls.list | 2 -
> .../unix/sysv/linux/wordsize-64/sendfile64.c | 1 -
> .../unix/sysv/linux/wordsize-64/syscalls.list | 1 -
> 7 files changed, 49 insertions(+), 11 deletions(-)
> delete mode 100644 sysdeps/unix/sysv/linux/mips/mips64/n64/sendfile64.c
> delete mode 100644 sysdeps/unix/sysv/linux/mips/mips64/n64/syscalls.list
> rename sysdeps/unix/sysv/linux/{generic/wordsize-32 => }/sendfile.c (77%)
> create mode 100644 sysdeps/unix/sysv/linux/sendfile64.c
> delete mode 100644 sysdeps/unix/sysv/linux/wordsize-64/sendfile64.c
>
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/sendfile64.c b/sysdeps/unix/sysv/linux/mips/mips64/n64/sendfile64.c
> deleted file mode 100644
> index 4c451bd093..0000000000
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/sendfile64.c
> +++ /dev/null
> @@ -1 +0,0 @@
> -/* sendfile64 is alias of sendfile syscall. */
OK. Remove.
> diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/syscalls.list b/sysdeps/unix/sysv/linux/mips/mips64/n64/syscalls.list
> deleted file mode 100644
> index 0924f245d4..0000000000
> --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/syscalls.list
> +++ /dev/null
> @@ -1,3 +0,0 @@
> -# File name Caller Syscall name # args Strong name Weak names
> -
> -sendfile - sendfile i:iipi sendfile sendfile64
OK. Remove.
> diff --git a/sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c b/sysdeps/unix/sysv/linux/sendfile.c
> similarity index 77%
> rename from sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c
> rename to sysdeps/unix/sysv/linux/sendfile.c
> index 4fdf979324..c8bc890944 100644
> --- a/sysdeps/unix/sysv/linux/generic/wordsize-32/sendfile.c
> +++ b/sysdeps/unix/sysv/linux/sendfile.c
OK. Moved.
> @@ -1,4 +1,5 @@
> -/* Copyright (C) 2011-2022 Free Software Foundation, Inc.
> +/* Transfer data between file descriptors. Linux version.
> + Copyright (C) 2011-2022 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
> @@ -20,11 +21,16 @@
> #include <errno.h>
> #include <sysdep.h>
>
> +#ifndef __OFF_T_MATCHES_OFF64_T
> +
> /* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
> descriptor OUT_FD. */
> ssize_t
> sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
> {
> +# ifdef __NR_sendfile
> + return INLINE_SYSCALL_CALL (sendfile, out_fd, in_fd, offset, count);
OK. Consolidated. Call sendfile if we have it.
> +# else
> __off64_t off64;
> int rc;
>
> @@ -38,9 +44,12 @@ sendfile (int out_fd, int in_fd, off_t *offset, size_t count)
> off64 = *offset;
> }
>
> - rc = INLINE_SYSCALL (sendfile64, 4, out_fd, in_fd,
> - offset ? &off64 : NULL, count);
> + rc = INLINE_SYSCALL_CALL (sendfile64, out_fd, in_fd, offset ? &off64 : NULL,
> + count);
OK. Otherwise call sendfile64.
> if (offset)
> *offset = off64;
> return rc;
> +# endif
> }
> +
> +#endif
> diff --git a/sysdeps/unix/sysv/linux/sendfile64.c b/sysdeps/unix/sysv/linux/sendfile64.c
> new file mode 100644
> index 0000000000..d9d2a4a4c2
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/sendfile64.c
> @@ -0,0 +1,37 @@
> +/* Transfer data between file descriptors. Linux version.
OK. New consolidated version.
> + Copyright (C) 2022 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/>. */
> +
> +#include <sys/sendfile.h>
> +#include <stddef.h>
> +#include <errno.h>
> +#include <sysdep.h>
> +
> +/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
> + descriptor OUT_FD. */
> +ssize_t
> +sendfile64 (int out_fd, int in_fd, off64_t *offset, size_t count)
> +{
> +#ifndef __NR_sendfile64
> +# define __NR_sendfile64 __NR_sendfile
> +#endif
> + return INLINE_SYSCALL_CALL (sendfile64, out_fd, in_fd, offset, count);
OK.
> +}
> +
> +#ifdef __OFF_T_MATCHES_OFF64_T
> +strong_alias (sendfile64, sendfile)
OK. Alias.
> +#endif
> diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
> index 6420049e8b..b9f45463c5 100644
> --- a/sysdeps/unix/sysv/linux/syscalls.list
> +++ b/sysdeps/unix/sysv/linux/syscalls.list
> @@ -62,8 +62,6 @@ sched_primin - sched_get_priority_min i:i __sched_get_priority_min sched_get_pri
> sched_setp - sched_setparam i:ip __sched_setparam sched_setparam
> sched_sets - sched_setscheduler i:iip __sched_setscheduler sched_setscheduler
> sched_yield - sched_yield i: __sched_yield sched_yield
> -sendfile - sendfile i:iipU sendfile
> -sendfile64 - sendfile64 i:iipU sendfile64
OK. Remove. We have C files for these.
> setfsgid EXTRA setfsgid i:i setfsgid
> setfsuid EXTRA setfsuid i:i setfsuid
> setpgid - setpgid i:ii __setpgid setpgid
> diff --git a/sysdeps/unix/sysv/linux/wordsize-64/sendfile64.c b/sysdeps/unix/sysv/linux/wordsize-64/sendfile64.c
> deleted file mode 100644
> index 4c451bd093..0000000000
> --- a/sysdeps/unix/sysv/linux/wordsize-64/sendfile64.c
> +++ /dev/null
> @@ -1 +0,0 @@
> -/* sendfile64 is alias of sendfile syscall. */
OK.
> diff --git a/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list b/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
> index 3232f11f51..db80696e41 100644
> --- a/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
> +++ b/sysdeps/unix/sysv/linux/wordsize-64/syscalls.list
> @@ -1,4 +1,3 @@
> # File name Caller Syscall name # args Strong name Weak names
>
> -sendfile - sendfile i:iipi sendfile sendfile64
OK. Have C files.
> personality EXTRA personality i:i __personality personality
--
Cheers,
Carlos.
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