diff options
Diffstat (limited to 'pkg/tcpip/link/rawfile/blockingpoll_amd64.s')
| -rw-r--r-- | pkg/tcpip/link/rawfile/blockingpoll_amd64.s | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/pkg/tcpip/link/rawfile/blockingpoll_amd64.s b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s new file mode 100644 index 000000000..b54131573 --- /dev/null +++ b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s @@ -0,0 +1,40 @@ +// Copyright 2018 The gVisor Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "textflag.h" + +// BlockingPoll makes the poll() syscall while calling the version of +// entersyscall that relinquishes the P so that other Gs can run. This is meant +// to be called in cases when the syscall is expected to block. +// +// func BlockingPoll(fds *PollEvent, nfds int, timeout int64) (n int, err syscall.Errno) +TEXT ·BlockingPoll(SB),NOSPLIT,$0-40 + CALL ·callEntersyscallblock(SB) + MOVQ fds+0(FP), DI + MOVQ nfds+8(FP), SI + MOVQ timeout+16(FP), DX + MOVQ $0x7, AX // SYS_POLL + SYSCALL + CMPQ AX, $0xfffffffffffff001 + JLS ok + MOVQ $-1, n+24(FP) + NEGQ AX + MOVQ AX, err+32(FP) + CALL ·callExitsyscall(SB) + RET +ok: + MOVQ AX, n+24(FP) + MOVQ $0, err+32(FP) + CALL ·callExitsyscall(SB) + RET |