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unix: add Ioctl{Get,Set}IfreqMTU on darwin

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For golang/go#41868

Change-Id: I9fb8f5eee933488e4c63aaa757059b8cea4d9629
Reviewed-on: https://go-review.googlesource.com/c/sys/+/264637
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Tobias Klauser
2020-10-23 17:34:06 +02:00
committed by Tobias Klauser
parent e075d93706
commit 119d4633e4
1 changed files with 23 additions and 0 deletions
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23
unix/syscall_darwin.go
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@@ -264,6 +264,29 @@ func IoctlCtlInfo(fd int, ctlInfo *CtlInfo) error {
return err
}
// IfreqMTU is struct ifreq used to get or set a network device's MTU.
type IfreqMTU struct {
Name [IFNAMSIZ]byte
MTU int32
}
// IoctlGetIfreqMTU performs the SIOCGIFMTU ioctl operation on fd to get the MTU
// of the network device specified by ifname.
func IoctlGetIfreqMTU(fd int, ifname string) (*IfreqMTU, error) {
var ifreq IfreqMTU
copy(ifreq.Name[:], ifname)
err := ioctl(fd, SIOCGIFMTU, uintptr(unsafe.Pointer(&ifreq)))
return &ifreq, err
}
// IoctlSetIfreqMTU performs the SIOCSIFMTU ioctl operation on fd to set the MTU
// of the network device specified by ifreq.Name.
func IoctlSetIfreqMTU(fd int, ifreq *IfreqMTU) error {
err := ioctl(fd, SIOCSIFMTU, uintptr(unsafe.Pointer(ifreq)))
runtime.KeepAlive(ifreq)
return err
}
//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS_SYSCTL
func Uname(uname *Utsname) error {