Change syscall.POLL to syscall.PPOLL.

syscall.POLL is not supported on arm64, using syscall.PPOLL
to support both the x86 and arm64. refs #63

Signed-off-by: Haibo Xu <haibo.xu@arm.com>
Change-Id: I2c81a063d3ec4e7e6b38fe62f17a0924977f505e
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/543 from xiaobo55x:master ba598263fd3748d1addd48e4194080aa12085164
PiperOrigin-RevId: 260752049

4 files changed, 13 insertions, 10 deletions

diff --git a/pkg/tcpip/link/rawfile/blockingpoll_amd64.s b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s
index b54131573..298bad55d 100644
--- a/pkg/tcpip/link/rawfile/blockingpoll_amd64.s
+++ b/pkg/tcpip/link/rawfile/blockingpoll_amd64.s
@@ -14,17 +14,18 @@
 
 #include "textflag.h"
 
-// BlockingPoll makes the poll() syscall while calling the version of
+// 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 int64) (n int, err syscall.Errno)
+// 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	$0x7, AX // SYS_POLL
+	MOVQ	$0x0, R10  // sigmask parameter which isn't used here
+	MOVQ	$0x10f, AX // SYS_PPOLL
 	SYSCALL
 	CMPQ	AX, $0xfffffffffffff001
 	JLS	ok
diff --git a/pkg/tcpip/link/rawfile/blockingpoll_amd64_unsafe.go b/pkg/tcpip/link/rawfile/blockingpoll_amd64_unsafe.go
index c87268610..47039a446 100644
--- a/pkg/tcpip/link/rawfile/blockingpoll_amd64_unsafe.go
+++ b/pkg/tcpip/link/rawfile/blockingpoll_amd64_unsafe.go
@@ -26,7 +26,7 @@ import (
 )
 
 //go:noescape
-func BlockingPoll(fds *PollEvent, nfds int, timeout int64) (int, syscall.Errno)
+func BlockingPoll(fds *PollEvent, nfds int, timeout *syscall.Timespec) (int, syscall.Errno)
 
 // Use go:linkname to call into the runtime. As of Go 1.12 this has to
 // be done from Go code so that we make an ABIInternal call to an
diff --git a/pkg/tcpip/link/rawfile/blockingpoll_unsafe.go b/pkg/tcpip/link/rawfile/blockingpoll_unsafe.go
index 4eab77c74..84dc0e918 100644
--- a/pkg/tcpip/link/rawfile/blockingpoll_unsafe.go
+++ b/pkg/tcpip/link/rawfile/blockingpoll_unsafe.go
@@ -21,9 +21,11 @@ import (
 	"unsafe"
 )
 
-// BlockingPoll is just a stub function that forwards to the poll() system call
+// BlockingPoll is just a stub function that forwards to the ppoll() system call
 // on non-amd64 platforms.
-func BlockingPoll(fds *PollEvent, nfds int, timeout int64) (int, syscall.Errno) {
-	n, _, e := syscall.Syscall(syscall.SYS_POLL, uintptr(unsafe.Pointer(fds)), uintptr(nfds), uintptr(timeout))
+func BlockingPoll(fds *PollEvent, nfds int, timeout *syscall.Timespec) (int, syscall.Errno) {
+	n, _, e := syscall.Syscall6(syscall.SYS_PPOLL, uintptr(unsafe.Pointer(fds)),
+		uintptr(nfds), uintptr(unsafe.Pointer(timeout)), 0, 0, 0)
+
 	return int(n), e
 }
diff --git a/pkg/tcpip/link/rawfile/rawfile_unsafe.go b/pkg/tcpip/link/rawfile/rawfile_unsafe.go
index e3fbb15c2..7e286a3a6 100644
--- a/pkg/tcpip/link/rawfile/rawfile_unsafe.go
+++ b/pkg/tcpip/link/rawfile/rawfile_unsafe.go
@@ -123,7 +123,7 @@ func BlockingRead(fd int, b []byte) (int, *tcpip.Error) {
 			Events: 1, // POLLIN
 		}
 
-		_, e = BlockingPoll(&event, 1, -1)
+		_, e = BlockingPoll(&event, 1, nil)
 		if e != 0 && e != syscall.EINTR {
 			return 0, TranslateErrno(e)
 		}
@@ -145,7 +145,7 @@ func BlockingReadv(fd int, iovecs []syscall.Iovec) (int, *tcpip.Error) {
 			Events: 1, // POLLIN
 		}
 
-		_, e = BlockingPoll(&event, 1, -1)
+		_, e = BlockingPoll(&event, 1, nil)
 		if e != 0 && e != syscall.EINTR {
 			return 0, TranslateErrno(e)
 		}
@@ -175,7 +175,7 @@ func BlockingRecvMMsg(fd int, msgHdrs []MMsgHdr) (int, *tcpip.Error) {
 			Events: 1, // POLLIN
 		}
 
-		if _, e := BlockingPoll(&event, 1, -1); e != 0 && e != syscall.EINTR {
+		if _, e := BlockingPoll(&event, 1, nil); e != 0 && e != syscall.EINTR {
 			return 0, TranslateErrno(e)
 		}
 	}