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unix: implement ppoll in terms of poll on Linux

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Android's Bionic libc installs a seccomp filter that allows ppoll but
not poll. This has been fine for arm64, where we already implement poll
in terms of ppoll, but not the other architectures, such as amd64, which
runs on Chromebooks, and currently leads to crashes.

This commit implements poll in terms of ppoll on the remaining
architectures and makes this common code, so that everyone uses the more
modern syscall.

Change-Id: Ic01a32b5abe48ab53a2549f592a41561f1684c30
Reviewed-on: https://go-review.googlesource.com/c/sys/+/352310
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Jason A. Donenfeld
2021-09-27 05:27:49 +00:00
parent 92d5a993a6
commit 1cf2251ac2
24 changed files with 9 additions and 237 deletions
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unix/syscall_linux.go
+9
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@@ -145,6 +145,15 @@ func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error
return ppoll(&fds[0], len(fds), timeout, sigmask)
}
func Poll(fds []PollFd, timeout int) (n int, err error) {
var ts *Timespec
if timeout >= 0 {
ts = new(Timespec)
*ts = NsecToTimespec(int64(timeout) * 1e6)
}
return Ppoll(fds, ts, nil)
}
//sys Readlinkat(dirfd int, path string, buf []byte) (n int, err error)
func Readlink(path string, buf []byte) (n int, err error) {