[PATCH] copy_file_range: update for glibc compatibility

[PATCH] copy_file_range: update for glibc compatibility

[Shawn Landden]

Signed-off-by: Shawn Landden <slandden-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 man2/copy_file_range.2 | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/man2/copy_file_range.2 b/man2/copy_file_range.2
index 6e50ea6ec..3a3a6aa9f 100644
--- a/man2/copy_file_range.2
+++ b/man2/copy_file_range.2
@@ -27,7 +27,7 @@
 copy_file_range \- Copy a range of data from one file to another
 .SH SYNOPSIS
 .nf
-.B #include <sys/syscall.h>
+.B #define _GNU_SOURCE
 .B #include <unistd.h>
 .PP
 .BI "ssize_t copy_file_range(int " fd_in ", loff_t *" off_in ,
@@ -124,12 +124,13 @@ are not on the same mounted filesystem.
 .SH VERSIONS
 The
 .BR copy_file_range ()
-system call first appeared in Linux 4.5.
-Library support was added in glibc 2.27.
+system call first appeared in Linux 4.5, but glibc 2.27 provides a user-space
+emulation when it is not available.
+.\" https://sourceware.org/git/?p=glibc.git;a=commit;f=posix/unistd.h;h=bad7a0c81f501fbbcc79af9eaa4b8254441c4a1f
 .SH CONFORMING TO
 The
 .BR copy_file_range ()
-system call is a nonstandard Linux extension.
+system call is a nonstandard Linux and GNU extension.
 .SH NOTES
 If
 .I file_in
-- 
2.14.1

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Re: [PATCH] copy_file_range: update for glibc compatibility

[Michael Kerrisk (man-pages)]

On 01/01/2018 05:12 AM, Shawn Landden wrote:
> Signed-off-by: Shawn Landden <slandden-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Thanks, Shawn. Applied.

Cheers,

Michael


> ---
>  man2/copy_file_range.2 | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/man2/copy_file_range.2 b/man2/copy_file_range.2
> index 6e50ea6ec..3a3a6aa9f 100644
> --- a/man2/copy_file_range.2
> +++ b/man2/copy_file_range.2
> @@ -27,7 +27,7 @@
>  copy_file_range \- Copy a range of data from one file to another
>  .SH SYNOPSIS
>  .nf
> -.B #include <sys/syscall.h>
> +.B #define _GNU_SOURCE
>  .B #include <unistd.h>
>  .PP
>  .BI "ssize_t copy_file_range(int " fd_in ", loff_t *" off_in ,
> @@ -124,12 +124,13 @@ are not on the same mounted filesystem.
>  .SH VERSIONS
>  The
>  .BR copy_file_range ()
> -system call first appeared in Linux 4.5.
> -Library support was added in glibc 2.27.
> +system call first appeared in Linux 4.5, but glibc 2.27 provides a user-space
> +emulation when it is not available.
> +.\" https://sourceware.org/git/?p=glibc.git;a=commit;f=posix/unistd.h;h=bad7a0c81f501fbbcc79af9eaa4b8254441c4a1f
>  .SH CONFORMING TO
>  The
>  .BR copy_file_range ()
> -system call is a nonstandard Linux extension.
> +system call is a nonstandard Linux and GNU extension.
>  .SH NOTES
>  If
>  .I file_in
> 


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
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