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use syscall.Open with O_NONBLOCK flag and os.NewFile after ioctls

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so that the file is pollable.
This commit is contained in:
Song Gao 2019-01-06 20:50:07 +00:00
parent ab2cda57af
commit 5d0ec8c62b
2 changed files with 11 additions and 9 deletions
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18
syscalls_linux.go
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@ -31,50 +31,52 @@ func ioctl(fd uintptr, request uintptr, argp uintptr) error {
}
func newTAP(config Config) (ifce *Interface, err error) {
file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
fdInt, err := syscall.Open("/dev/net/tun", os.O_RDWR|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, err
}
fd := uintptr(fdInt)
var flags uint16
flags = cIFFTAP | cIFFNOPI
if config.PlatformSpecificParams.MultiQueue {
flags |= cIFFMULTIQUEUE
}
name, err := createInterface(file.Fd(), config.Name, flags)
name, err := createInterface(fd, config.Name, flags)
if err != nil {
return nil, err
}
if err = setDeviceOptions(file.Fd(), config); err != nil {
if err = setDeviceOptions(fd, config); err != nil {
return nil, err
}
ifce = &Interface{isTAP: true, ReadWriteCloser: file, name: name}
ifce = &Interface{isTAP: true, ReadWriteCloser: os.NewFile(fd, "tun"), name: name}
return
}
func newTUN(config Config) (ifce *Interface, err error) {
file, err := os.OpenFile("/dev/net/tun", os.O_RDWR, 0)
fdInt, err := syscall.Open("/dev/net/tun", os.O_RDWR|syscall.O_NONBLOCK, 0)
if err != nil {
return nil, err
}
fd := uintptr(fdInt)
var flags uint16
flags = cIFFTUN | cIFFNOPI
if config.PlatformSpecificParams.MultiQueue {
flags |= cIFFMULTIQUEUE
}
name, err := createInterface(file.Fd(), config.Name, flags)
name, err := createInterface(fd, config.Name, flags)
if err != nil {
return nil, err
}
if err = setDeviceOptions(file.Fd(), config); err != nil {
if err = setDeviceOptions(fd, config); err != nil {
return nil, err
}
ifce = &Interface{isTAP: false, ReadWriteCloser: file, name: name}
ifce = &Interface{isTAP: false, ReadWriteCloser: os.NewFile(fd, "tun"), name: name}
return
}