1 files changed, 50 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/write_msg.go b/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/write_msg.go
new file mode 100644
index 0000000..fe9e15e
--- /dev/null
+++ b/dependencies/pkg/mod/github.com/ssgreg/journald@v1.0.0/write_msg.go
@@ -0,0 +1,50 @@
+// +build !go1.9
+
+package journald
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+// Go implementation of sendmsg (UnixConn.WriteMsgUnix) is not suitable
+// for systemd's Journal in case of sending file descriptors. It always
+// sends a dummy data byte, but journal does not expect to get it:
+//
+// n = recvmsg(fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC);
+// ...
+// if (n > 0 && n_fds == 0)
+//     server_process_native_message(...);
+// else if (n == 0 && n_fds == 1)
+//     server_process_native_file(...);
+// else if (n_fds > 0)
+//     log_warning("Got too many file descriptors via native socket. Ignoring.");
+//
+// So we get a warning message (the last line) instead of the new log
+// entry.
+//
+func writeMsgUnix(c *net.UnixConn, oob []byte, addr *net.UnixAddr) (oobn int, err error) {
+	ptr, salen := sockaddr(addr)
+
+	var msg syscall.Msghdr
+	msg.Name = (*byte)(ptr)
+	msg.Namelen = uint32(salen)
+	msg.Control = (*byte)(unsafe.Pointer(&oob[0]))
+	msg.SetControllen(len(oob))
+
+	f, err := c.File()
+	if err != nil {
+		return 0, err
+	}
+	defer f.Close()
+
+	_, n, errno := syscall.Syscall(unix.SYS_SENDMSG, f.Fd(), uintptr(unsafe.Pointer(&msg)), 0)
+	if errno != 0 {
+		return int(n), errno
+	}
+
+	return int(n), nil
+}