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// +build go1.9
package journald
import (
"net"
"syscall"
"unsafe"
"golang.org/x/sys/unix"
)
// Check function description in write_msg.go
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))
rawConn, err := c.SyscallConn()
if err != nil {
return 0, err
}
var n uintptr
var errno syscall.Errno
err = rawConn.Write(func(fd uintptr) bool {
_, n, errno = syscall.Syscall(unix.SYS_SENDMSG, fd, uintptr(unsafe.Pointer(&msg)), 0)
return true
})
if err == nil {
if errno != 0 {
err = errno
}
}
return int(n), err
}
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