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syscall: add test for Flock_t roundtrip

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See CL 9962 for the rationale.

Change-Id: I73c714fce258430eea1e61d3835f5c8e9014ca1f
Signed-off-by: Shenghou Ma <minux@golang.org>
Reviewed-on: https://go-review.googlesource.com/9925
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Shenghou Ma 2015-05-12 01:13:09 -04:00 committed by Minux Ma
parent 38631846bf
commit ed8ae79282
1 changed files with 47 additions and 12 deletions
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59
src/syscall/syscall_unix_test.go
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@ -60,20 +60,55 @@ func _() {
// TestFcntlFlock tests whether the file locking structure matches
// the calling convention of each kernel.
// On some Linux systems, glibc uses another set of values for the
// commands and translates them to the correct value that the kernel
// expects just before the actual fcntl syscall. As Go uses raw
// syscalls directly, it must use the real value, not the glibc value.
// Thus this test also verifies that the Flock_t structure can be
// roundtripped with F_SETLK and F_GETLK.
func TestFcntlFlock(t *testing.T) {
name := filepath.Join(os.TempDir(), "TestFcntlFlock")
fd, err := syscall.Open(name, syscall.O_CREAT|syscall.O_RDWR|syscall.O_CLOEXEC, 0)
if err != nil {
t.Fatalf("Open failed: %v", err)
}
defer syscall.Unlink(name)
defer syscall.Close(fd)
flock := syscall.Flock_t{
Type: syscall.F_RDLCK,
Start: 0, Len: 0, Whence: 1,
Type: syscall.F_WRLCK,
Start: 31415, Len: 271828, Whence: 1,
}
if err := syscall.FcntlFlock(uintptr(fd), syscall.F_GETLK, &flock); err != nil {
t.Fatalf("FcntlFlock failed: %v", err)
if os.Getenv("GO_WANT_HELPER_PROCESS") == "" {
// parent
name := filepath.Join(os.TempDir(), "TestFcntlFlock")
fd, err := syscall.Open(name, syscall.O_CREAT|syscall.O_RDWR|syscall.O_CLOEXEC, 0)
if err != nil {
t.Fatalf("Open failed: %v", err)
}
defer syscall.Unlink(name)
defer syscall.Close(fd)
if err := syscall.Ftruncate(fd, 1<<20); err != nil {
t.Fatalf("Ftruncate(1<<20) failed: %v", err)
}
if err := syscall.FcntlFlock(uintptr(fd), syscall.F_SETLK, &flock); err != nil {
t.Fatalf("FcntlFlock(F_SETLK) failed: %v", err)
}
cmd := exec.Command(os.Args[0], "-test.run=^TestFcntlFlock$")
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.ExtraFiles = []*os.File{os.NewFile(uintptr(fd), name)}
out, err := cmd.CombinedOutput()
if len(out) > 0 || err != nil {
t.Fatalf("child process: %q, %v", out, err)
}
} else {
// child
got := flock
// make sure the child lock is conflicting with the parent lock
got.Start--
got.Len++
if err := syscall.FcntlFlock(3, syscall.F_GETLK, &got); err != nil {
t.Fatalf("FcntlFlock(F_GETLK) failed: %v", err)
}
flock.Pid = int32(syscall.Getppid())
// Linux kernel always set Whence to 0
flock.Whence = 0
if got.Type == flock.Type && got.Start == flock.Start && got.Len == flock.Len && got.Pid == flock.Pid && got.Whence == flock.Whence {
os.Exit(0)
}
t.Fatalf("FcntlFlock got %v, want %v", got, flock)
}
}
@ -121,7 +156,7 @@ func TestPassFD(t *testing.T) {
defer readFile.Close()
cmd := exec.Command(os.Args[0], "-test.run=^TestPassFD$", "--", tempDir)
cmd.Env = []string{"GO_WANT_HELPER_PROCESS=1"}
cmd.Env = append(os.Environ(), "GO_WANT_HELPER_PROCESS=1")
cmd.ExtraFiles = []*os.File{writeFile}
out, err := cmd.CombinedOutput()