1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
//+build linux
package vsock
import (
"golang.org/x/sys/unix"
)
// newConn creates a Conn using a connFD, immediately setting the connFD to
// non-blocking mode for use with the runtime network poller.
func newConn(cfd connFD, local, remote *Addr) (*Conn, error) {
// Note: if any calls fail after this point, cfd.Close should be invoked
// for cleanup because the socket is now non-blocking.
if err := cfd.SetNonblocking(local.fileName()); err != nil {
return nil, err
}
return &Conn{
fd: cfd,
local: local,
remote: remote,
}, nil
}
// dial is the entry point for Dial on Linux.
func dial(cid, port uint32) (*Conn, error) {
cfd, err := newConnFD()
if err != nil {
return nil, err
}
return dialLinux(cfd, cid, port)
}
// dialLinux is the entry point for tests on Linux.
func dialLinux(cfd connFD, cid, port uint32) (c *Conn, err error) {
defer func() {
if err != nil {
// If any system calls fail during setup, the socket must be closed
// to avoid file descriptor leaks.
_ = cfd.EarlyClose()
}
}()
rsa := &unix.SockaddrVM{
CID: cid,
Port: port,
}
if err := cfd.Connect(rsa); err != nil {
return nil, err
}
lsa, err := cfd.Getsockname()
if err != nil {
return nil, err
}
lsavm := lsa.(*unix.SockaddrVM)
local := &Addr{
ContextID: lsavm.CID,
Port: lsavm.Port,
}
remote := &Addr{
ContextID: cid,
Port: port,
}
return newConn(cfd, local, remote)
}
|
