github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/tcpip/link/rawfile/blockingpoll_noyield_unsafe.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // +build linux,!amd64,!arm64
    16  
    17  package rawfile
    18  
    19  import (
    20  	"unsafe"
    21  
    22  	"golang.org/x/sys/unix"
    23  )
    24  
    25  // BlockingPoll is just a stub function that forwards to the ppoll() system call
    26  // on non-amd64 and non-arm64 platforms.
    27  func BlockingPoll(fds *PollEvent, nfds int, timeout *unix.Timespec) (int, unix.Errno) {
    28  	n, _, e := unix.Syscall6(unix.SYS_PPOLL, uintptr(unsafe.Pointer(fds)),
    29  		uintptr(nfds), uintptr(unsafe.Pointer(timeout)), 0, 0, 0)
    30  
    31  	return int(n), e
    32  }