rwcancel: use unix.Poll again but bump x/sys so it uses ppoll under the hood

This reverts commit fcc601dbf0f6b626ec1d47a880cbe64f9c8fe385 but then
bumps go.mod.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

5 files changed, 14 insertions, 54 deletions

diff --git a/go.mod b/go.mod
index 18769da..5d8388b 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module golang.zx2c4.com/wireguard
 go 1.16
 
 require (
-	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
-	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
-	golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519
+	golang.org/x/net v0.0.0-20210927181540-4e4d966f7476
+	golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6
 )
diff --git a/go.sum b/go.sum
index 85c81a0..5499af9 100644
--- a/go.sum
+++ b/go.sum
@@ -1,22 +1,14 @@
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 h1:/ZScEX8SfEmUGRHs0gxpqteO5nfNW6axyZbBdw9A12g=
-golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 h1:7I4JAnoQBe7ZtJcBaYHi5UtiO8tQHbUSXxL+pnGRANg=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/net v0.0.0-20210927181540-4e4d966f7476 h1:s5hu7bTnLKswvidgtqc4GwsW83m9LZu8UAqzmWOZtI4=
+golang.org/x/net v0.0.0-20210927181540-4e4d966f7476/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210309040221-94ec62e08169 h1:fpeMGRM6A+XFcw4RPCO8s8hH7ppgrGR22pSIjwM7YUI=
-golang.org/x/sys v0.0.0-20210309040221-94ec62e08169/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54 h1:rF3Ohx8DRyl8h2zw9qojyLHLhrJpEMgyPOImREEryf0=
-golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210402192133-700132347e07 h1:4k6HsQjxj6hVMsI2Vf0yKlzt5lXxZsMW1q0zaq2k8zY=
-golang.org/x/sys v0.0.0-20210402192133-700132347e07/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57 h1:F5Gozwx4I1xtr/sr/8CFbb57iKi3297KFs0QDbGN60A=
-golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6 h1:foEbQz/B0Oz6YIqu/69kfXPYeFQAuuMYFkjaqXzl5Wo=
+golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/rwcancel/poll_linux.go b/rwcancel/poll_linux.go
deleted file mode 100644
index d9938c5..0000000
--- a/rwcancel/poll_linux.go
+++ /dev/null
@@ -1,17 +0,0 @@
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package rwcancel
-
-import "golang.org/x/sys/unix"
-
-func poll(fds []unix.PollFd, timeout int) (n int, err error) {
-	var ts *unix.Timespec
-	if timeout >= 0 {
-		ts = new(unix.Timespec)
-		*ts = unix.NsecToTimespec(int64(timeout) * 1e6)
-	}
-	return unix.Ppoll(fds, ts, nil)
-}
diff --git a/rwcancel/poll_unix.go b/rwcancel/poll_unix.go
deleted file mode 100644
index 37e9686..0000000
--- a/rwcancel/poll_unix.go
+++ /dev/null
@@ -1,15 +0,0 @@
-//go:build !windows && !linux
-// +build !windows,!linux
-
-/* SPDX-License-Identifier: MIT
- *
- * Copyright (C) 2017-2021 WireGuard LLC. All Rights Reserved.
- */
-
-package rwcancel
-
-import "golang.org/x/sys/unix"
-
-func poll(fds []unix.PollFd, timeout int) (n int, err error) {
-	return unix.Poll(fds, timeout)
-}
diff --git a/rwcancel/rwcancel.go b/rwcancel/rwcancel.go
index 45cc73b..7013b16 100644
--- a/rwcancel/rwcancel.go
+++ b/rwcancel/rwcancel.go
@@ -49,7 +49,7 @@ func (rw *RWCancel) ReadyRead() bool {
 	pollFds := []unix.PollFd{{Fd: int32(rw.fd), Events: unix.POLLIN}, {Fd: closeFd, Events: unix.POLLIN}}
 	var err error
 	for {
-		_, err = poll(pollFds, -1)
+		_, err = unix.Poll(pollFds, -1)
 		if err == nil || !RetryAfterError(err) {
 			break
 		}
@@ -68,7 +68,7 @@ func (rw *RWCancel) ReadyWrite() bool {
 	pollFds := []unix.PollFd{{Fd: int32(rw.fd), Events: unix.POLLOUT}, {Fd: closeFd, Events: unix.POLLOUT}}
 	var err error
 	for {
-		_, err = poll(pollFds, -1)
+		_, err = unix.Poll(pollFds, -1)
 		if err == nil || !RetryAfterError(err) {
 			break
 		}