internal/poll: add GetsockoptInt

This new function wraps the getsockopt network call with an integer
argument, similar to SetsockoptInt.

This will be used in MPTCP in the following commit.

This work has been co-developed by Gregory Detal
<gregory.detal@tessares.net>.

Updates #59166

Change-Id: I8f6aa00ea2535683d9bbf436993c23e9c6ca2af3
Reviewed-on: https://go-review.googlesource.com/c/go/+/471139
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

diff --git a/src/internal/poll/sockopt.go b/src/internal/poll/sockopt.go
index a7c9d115b4ace67395d9475bb3550d4122cae6aa..a87a9e64135a430c36c6ea13fb6ea69942fd8c11 100644 (file)
--- a/src/internal/poll/sockopt.go
+++ b/src/internal/poll/sockopt.go
@@ -34,3 +34,12 @@ func (fd *FD) SetsockoptLinger(level, name int, l *syscall.Linger) error {
        defer fd.decref()
        return syscall.SetsockoptLinger(fd.Sysfd, level, name, l)
 }
+
+// GetsockoptInt wraps the getsockopt network call with an int argument.
+func (fd *FD) GetsockoptInt(level, name int) (int, error) {
+       if err := fd.incref(); err != nil {
+               return -1, err
+       }
+       defer fd.decref()
+       return syscall.GetsockoptInt(fd.Sysfd, level, name)
+}