[PATCH] copy_file_range: update for glibc compatibility

Shawn Landden
2018-01-01T04:12:59Z

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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