The man page describes that vmsplice can splice pages from
memory to a pipe, but it can work to anonther direction as well.
Cc: Jens Axboe <redacted>
Signed-off-by: Andrei Vagin <redacted>
---
man2/vmsplice.2 | 24 +++++++++++++++++++++---
1 file changed, 21 insertions(+), 3 deletions(-)
diff --git a/man2/vmsplice.2 b/man2/vmsplice.2
index e3e61cf27..8f48b8809 100644
--- a/man2/vmsplice.2
+++ b/man2/vmsplice.2
@@ -25,7 +25,7 @@
.\"
.TH VMSPLICE 2 2014-10-02 "Linux" "Linux Programmer's Manual"
.SH NAME
-vmsplice \- splice user pages into a pipe
+vmsplice \- splice user pages to/from a pipe
.SH SYNOPSIS
.nf
.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
@@ -44,13 +44,25 @@ vmsplice \- splice user pages into a pipe
.\" the kernel-space one (contrast this to "write()", which copies
.\" the actual data, and you can thus reuse the buffer immediately
.\" after a successful write), but that is often easy to do.
-The
+If
+.I fd
+is opened for writting, the
.BR vmsplice ()
system call maps
.I nr_segs
ranges of user memory described by
.I iov
into a pipe.
+.\" commit 6a14b90bb6bc7cd83e2a444bf457a2ea645cbfe7
+If
+.I fd
+is opened for reading, the
+.BR vmsplice ()
+system call fills
+.I nr_segs
+ranges of user memory described by
+.I iov
+from a pipe.
The file descriptor
.I fd
must refer to a pipe.
@@ -70,7 +82,6 @@ struct iovec {
};
.in
.fi