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authorKevin Krakauer <krakauer@google.com>2020-02-05 14:43:11 -0800
committerKevin Krakauer <krakauer@google.com>2020-02-05 14:43:11 -0800
commitbf0ea204e9415a181c63ee10078cca753df14f7e (patch)
treef4d149ac2bf2ea900f8b2a0cdea0a7a2ea7e6d0e /pkg/safemem
parent29ad5762e4549d961f48c65292cfdeb7256524f6 (diff)
parentf2d3efca1deded31a2929ea77c0eecf476764660 (diff)
Merge branch 'master' into tcp-matchers-submit
Diffstat (limited to 'pkg/safemem')
-rw-r--r--pkg/safemem/seq_unsafe.go17
1 files changed, 17 insertions, 0 deletions
diff --git a/pkg/safemem/seq_unsafe.go b/pkg/safemem/seq_unsafe.go
index 354a95dde..dcdfc9600 100644
--- a/pkg/safemem/seq_unsafe.go
+++ b/pkg/safemem/seq_unsafe.go
@@ -18,6 +18,7 @@ import (
"bytes"
"fmt"
"reflect"
+ "syscall"
"unsafe"
)
@@ -297,3 +298,19 @@ func ZeroSeq(dsts BlockSeq) (uint64, error) {
}
return done, nil
}
+
+// IovecsFromBlockSeq returns a []syscall.Iovec representing seq.
+func IovecsFromBlockSeq(bs BlockSeq) []syscall.Iovec {
+ iovs := make([]syscall.Iovec, 0, bs.NumBlocks())
+ for ; !bs.IsEmpty(); bs = bs.Tail() {
+ b := bs.Head()
+ iovs = append(iovs, syscall.Iovec{
+ Base: &b.ToSlice()[0],
+ Len: uint64(b.Len()),
+ })
+ // We don't need to care about b.NeedSafecopy(), because the host
+ // kernel will handle such address ranges just fine (by returning
+ // EFAULT).
+ }
+ return iovs
+}