shm_test.go RawHistoryFolder

1package core
2
3import (
4	"os"
5	"strconv"
6	"syscall"
7	"testing"
8)
9
10func TestMemfdShmRoundTrip(t *testing.T) {
11	fd, data, err := memfdShm{}.NewSharedMem("pw-video-test", 4096)
12	if err != nil {
13		t.Skipf("memfd_create unavailable: %v", err)
14	}
15	if len(data) != 4096 {
16		t.Fatalf("len = %d", len(data))
17	}
18	data[0], data[4095] = 1, 2
19	// Re-map through the fd: the memory is shared and sealed against resizing.
20	again, err := syscall.Mmap(fd, 0, 4096, syscall.PROT_READ, syscall.MAP_SHARED)
21	if err != nil {
22		t.Fatal(err)
23	}
24	if again[0] != 1 || again[4095] != 2 {
25		t.Fatal("memfd is not shared")
26	}
27	if err := syscall.Ftruncate(fd, 8192); err == nil {
28		t.Fatal("sealed memfd was resized")
29	}
30	_ = syscall.Munmap(again)
31	memfdShm{}.FreeSharedMem(fd, data)
32	if _, err := os.Stat("/proc/self/fd/" + strconv.Itoa(fd)); err == nil {
33		t.Fatal("fd still open after FreeSharedMem")
34	}
35	if _, _, err := (memfdShm{}).NewSharedMem("x", 0); err == nil {
36		t.Fatal("zero size accepted")
37	}
38}