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// Copyright 2019 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
BL ·callEntersyscallblock(SB)
MOVD fds+0(FP), R0
MOVD nfds+8(FP), R1
MOVD timeout+16(FP), R2
MOVD $0x0, R3 // sigmask parameter which isn't used here
MOVD $0x49, R8 // SYS_PPOLL
SVC
CMP $0xfffffffffffff001, R0
BLS ok
MOVD $-1, R1
MOVD R1, n+24(FP)
NEG R0, R0
MOVD R0, err+32(FP)
BL ·callExitsyscall(SB)
RET
ok:
MOVD R0, n+24(FP)
MOVD $0, err+32(FP)
BL ·callExitsyscall(SB)
RET
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