inet.af/netstack@v0.0.0-20220214151720-7585b01ddccf/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  //go:build linux && !amd64 && !arm64
    16  // +build linux,!amd64,!arm64
    17  
    18  package rawfile
    19  
    20  import (
    21  	"unsafe"
    22  
    23  	"golang.org/x/sys/unix"
    24  )
    25  
    26  // BlockingPoll is just a stub function that forwards to the ppoll() system call
    27  // on non-amd64 and non-arm64 platforms.
    28  func BlockingPoll(fds *PollEvent, nfds int, timeout *unix.Timespec) (int, unix.Errno) {
    29  	n, _, e := unix.Syscall6(unix.SYS_PPOLL, uintptr(unsafe.Pointer(fds)),
    30  		uintptr(nfds), uintptr(unsafe.Pointer(timeout)), 0, 0, 0)
    31  
    32  	return int(n), e
    33  }