1 files changed, 24 insertions, 1 deletions
diff --git a/src/syscall/syscall_illumos.go b/src/syscall/syscall_illumos.go
index 1484337e1b..d70a436d13 100644
--- a/src/syscall/syscall_illumos.go
+++ b/src/syscall/syscall_illumos.go
@@ -10,11 +10,34 @@ package syscall
 
 import "unsafe"
 
+//go:cgo_import_dynamic libc_accept4 accept4 "libsocket.so"
 //go:cgo_import_dynamic libc_flock flock "libc.so"
 
+//go:linkname procAccept4 libc_accept4
 //go:linkname procFlock libc_flock
 
-var procFlock libcFunc
+var (
+	procAccept4,
+	procFlock libcFunc
+)
+
+func Accept4(fd int, flags int) (int, Sockaddr, error) {
+	var rsa RawSockaddrAny
+	var addrlen _Socklen = SizeofSockaddrAny
+	nfd, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procAccept4)), 4, uintptr(fd), uintptr(unsafe.Pointer(&rsa)), uintptr(unsafe.Pointer(&addrlen)), uintptr(flags), 0, 0)
+	if errno != 0 {
+		return 0, nil, errno
+	}
+	if addrlen > SizeofSockaddrAny {
+		panic("RawSockaddrAny too small")
+	}
+	sa, err := anyToSockaddr(&rsa)
+	if err != nil {
+		Close(int(nfd))
+		return 0, nil, err
+	}
+	return int(nfd), sa, nil
+}
 
 func Flock(fd int, how int) error {
 	_, _, errno := sysvicall6(uintptr(unsafe.Pointer(&procFlock)), 2, uintptr(fd), uintptr(how), 0, 0, 0, 0)