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unix: extend rlimit test on Linux

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The basic Getrlimit functionality is already tested in TestRlimit. Use
the Linux-specific test to check whether setting RLIMIT_AS has the
desired effect regarding mmap, as specified in
http://man7.org/linux/man-pages/man2/getrlimit.2.html

Change-Id: I3e2c5769d9144cb4059735709a89a12f42568465
Reviewed-on: https://go-review.googlesource.com/100175
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Tobias Klauser
2018-03-12 17:10:05 +01:00
committed by Tobias Klauser
parent c28acc882e
commit 8c0ece68c2
1 changed files with 36 additions and 1 deletions
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37
unix/syscall_linux_test.go
View File

@@ -10,6 +10,7 @@ import (
"io/ioutil"
"os"
"runtime"
"runtime/debug"
"testing"
"time"
@@ -173,12 +174,46 @@ func TestUtimesNanoAt(t *testing.T) {
}
}
func TestGetrlimit(t *testing.T) {
func TestRlimitAs(t *testing.T) {
// disable GC during to avoid flaky test
defer debug.SetGCPercent(debug.SetGCPercent(-1))
var rlim unix.Rlimit
err := unix.Getrlimit(unix.RLIMIT_AS, &rlim)
if err != nil {
t.Fatalf("Getrlimit: %v", err)
}
var zero unix.Rlimit
if zero == rlim {
t.Fatalf("Getrlimit: got zero value %#v", rlim)
}
set := rlim
set.Cur = uint64(unix.Getpagesize())
err = unix.Setrlimit(unix.RLIMIT_AS, &set)
if err != nil {
t.Fatalf("Setrlimit: set failed: %#v %v", set, err)
}
// RLIMIT_AS was set to the page size, so mmap()'ing twice the page size
// should fail. See 'man 2 getrlimit'.
_, err = unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
if err == nil {
t.Fatal("Mmap: unexpectedly suceeded after setting RLIMIT_AS")
}
err = unix.Setrlimit(unix.RLIMIT_AS, &rlim)
if err != nil {
t.Fatalf("Setrlimit: restore failed: %#v %v", rlim, err)
}
b, err := unix.Mmap(-1, 0, 2*unix.Getpagesize(), unix.PROT_NONE, unix.MAP_ANON|unix.MAP_PRIVATE)
if err != nil {
t.Fatalf("Mmap: %v", err)
}
err = unix.Munmap(b)
if err != nil {
t.Fatalf("Munmap: %v", err)
}
}
func TestSelect(t *testing.T) {