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unix: cap RLIMIT_NOFILE soft limit in TestRlimit on darwin

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On some machines, kern.maxfilesperproc is 4096. If Rlimit.Cur is larger
than that, Setrlimit will get an errEINVAL.

Same as CL 246658 did in package syscall.

Updates golang/go#40564

Change-Id: I8c45a23352fa2039772e04205680640e8a0e1840
Reviewed-on: https://go-review.googlesource.com/c/sys/+/250000
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matt Layher <mdlayher@gmail.com>
This commit is contained in:
Tobias Klauser
2020-08-24 11:36:23 +02:00
committed by Tobias Klauser
parent 2bddbd2f0c
commit c12d262b63
1 changed files with 8 additions and 5 deletions
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13
unix/syscall_unix_test.go
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@@ -377,11 +377,11 @@ func TestRlimit(t *testing.T) {
}
set := rlimit
set.Cur = set.Max - 1
if runtime.GOOS == "darwin" && set.Cur > 10240 {
// The max file limit is 10240, even though
// the max returned by Getrlimit is 1<<63-1.
// This is OPEN_MAX in sys/syslimits.h.
set.Cur = 10240
if runtime.GOOS == "darwin" && set.Cur > 4096 {
// rlim_min for RLIMIT_NOFILE should be equal to
// or lower than kern.maxfilesperproc, which on
// some machines are 4096. See #40564.
set.Cur = 4096
}
err = unix.Setrlimit(unix.RLIMIT_NOFILE, &set)
if err != nil {
@@ -394,6 +394,9 @@ func TestRlimit(t *testing.T) {
}
set = rlimit
set.Cur = set.Max - 1
if runtime.GOOS == "darwin" && set.Cur > 4096 {
set.Cur = 4096
}
if set != get {
// Seems like Darwin requires some privilege to
// increase the soft limit of rlimit sandbox, though