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Ensure DialPipe times eventually by default

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Signed-off-by: John Starks <jostarks@microsoft.com>
This commit is contained in:
John Starks
2016-01-31 14:00:21 -08:00
parent 3191792462
commit 99eef7be8d
3 changed files with 31 additions and 13 deletions
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pipe.go
+15 -9
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@@ -21,12 +21,15 @@ const (
cERROR_PIPE_CONNECTED = syscall.Errno(535)
cERROR_SEM_TIMEOUT = syscall.Errno(121)
pipeFlagAccessDuplex = 0x3
pipeFlagFirstInstance = 0x80000
cPIPE_ACCESS_DUPLEX = 0x3
cFILE_FLAG_FIRST_PIPE_INSTANCE = 0x80000
pipeModeRejectRemoteClients = 0x8
cPIPE_REJECT_REMOTE_CLIENTS = 0x8
pipeUnlimitedInstances = 255
cPIPE_UNLIMITED_INSTANCES = 255
cNMPWAIT_USE_DEFAULT_WAIT = 0
cNMPWAIT_NOWAIT = 1
)
var (
@@ -71,6 +74,9 @@ func makeWin32Pipe(h syscall.Handle, path string) (*win32Pipe, error) {
return &win32Pipe{f, path}, nil
}
// DialPipe connects to a named pipe by path, timing out if the connection
// takes longer than the specified duration. If timeout is nil, then the timeout
// is the default timeout established by the pipe server.
func DialPipe(path string, timeout *time.Duration) (net.Conn, error) {
var absTimeout time.Time
if timeout != nil {
@@ -86,9 +92,9 @@ func DialPipe(path string, timeout *time.Duration) (net.Conn, error) {
now := time.Now()
var ms uint32
if absTimeout.IsZero() {
ms = syscall.INFINITE
ms = cNMPWAIT_USE_DEFAULT_WAIT
} else if now.After(absTimeout) {
ms = 1
ms = cNMPWAIT_NOWAIT
} else {
ms = uint32(absTimeout.Sub(now).Nanoseconds() / 1000 / 1000)
}
@@ -126,9 +132,9 @@ type win32PipeListener struct {
}
func makeServerPipeHandle(path, securityDescriptor string, first bool) (syscall.Handle, error) {
var flags uint32 = pipeFlagAccessDuplex | syscall.FILE_FLAG_OVERLAPPED
var flags uint32 = cPIPE_ACCESS_DUPLEX | syscall.FILE_FLAG_OVERLAPPED
if first {
flags |= pipeFlagFirstInstance
flags |= cFILE_FLAG_FIRST_PIPE_INSTANCE
}
var sd uintptr
if securityDescriptor != "" {
@@ -140,7 +146,7 @@ func makeServerPipeHandle(path, securityDescriptor string, first bool) (syscall.
var sa syscall.SecurityAttributes
sa.Length = uint32(unsafe.Sizeof(sa))
sa.SecurityDescriptor = sd
h, err := createNamedPipe(path, flags, pipeModeRejectRemoteClients, pipeUnlimitedInstances, 4096, 4096, 0, &sa)
h, err := createNamedPipe(path, flags, cPIPE_REJECT_REMOTE_CLIENTS, cPIPE_UNLIMITED_INSTANCES, 4096, 4096, 0, &sa)
if sd != 0 {
localFree(sd)
}