1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// 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 ppoll() 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 *syscall.Timespec) (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 $0x0, R10 // sigmask parameter which isn't used here
MOVQ $0x10f, AX // SYS_PPOLL
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
|
