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runtime: check sched_getaffinity return value

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Android on ChromeOS uses a restrictive seccomp filter that blocks
sched_getaffinity, leading this code to index a slice by -errno.

Change-Id: Iec09a4f79dfbc17884e24f39bcfdad305de75b37
Reviewed-on: https://go-review.googlesource.com/34794
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Michael Marineau 2017-01-03 00:15:05 -08:00 committed by Ian Lance Taylor
parent d698e614a2
commit 6a1cac2700
1 changed files with 3 additions and 0 deletions
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3
src/runtime/os_linux.go
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@ -91,6 +91,9 @@ func getproccount() int32 {
const maxCPUs = 64 * 1024
var buf [maxCPUs / (sys.PtrSize * 8)]uintptr
r := sched_getaffinity(0, unsafe.Sizeof(buf), &buf[0])
if r < 0 {
return 1
}
n := int32(0)
for _, v := range buf[:r/sys.PtrSize] {
for v != 0 {