Format struct itimerspec

PiperOrigin-RevId: 212874745
Change-Id: I0c3e8e6a9e8976631cee03bf0b8891b336ddb8c8

pkg/sentry/strace/linux64.go

@@ -240,8 +240,8 @@ var linuxAMD64 = SyscallMap{
 	220: makeSyscallInfo("semtimedop", Hex, Hex, Hex, Hex),
 	221: makeSyscallInfo("fadvise64", Hex, Hex, Hex, Hex),
 	222: makeSyscallInfo("timer_create", Hex, Hex, Hex),
-	223: makeSyscallInfo("timer_settime", Hex, Hex, Hex, Hex),
-	224: makeSyscallInfo("timer_gettime", Hex, Hex),
+	223: makeSyscallInfo("timer_settime", Hex, Hex, ItimerSpec, PostItimerSpec),
+	224: makeSyscallInfo("timer_gettime", Hex, PostItimerSpec),
 	225: makeSyscallInfo("timer_getoverrun", Hex),
 	226: makeSyscallInfo("timer_delete", Hex),
 	227: makeSyscallInfo("clock_settime", Hex, Timespec),
@@ -303,8 +303,8 @@ var linuxAMD64 = SyscallMap{
 	283: makeSyscallInfo("timerfd_create", Hex, Hex),
 	284: makeSyscallInfo("eventfd", Hex),
 	285: makeSyscallInfo("fallocate", Hex, Hex, Hex, Hex),
-	286: makeSyscallInfo("timerfd_settime", Hex, Hex, Hex, Hex),
-	287: makeSyscallInfo("timerfd_gettime", Hex, Hex),
+	286: makeSyscallInfo("timerfd_settime", Hex, Hex, ItimerSpec, PostItimerSpec),
+	287: makeSyscallInfo("timerfd_gettime", Hex, PostItimerSpec),
 	288: makeSyscallInfo("accept4", Hex, PostSockAddr, SockLen, SockFlags),
 	289: makeSyscallInfo("signalfd4", Hex, Hex, Hex, Hex),
 	290: makeSyscallInfo("eventfd2", Hex, Hex),

pkg/sentry/strace/strace.go

@@ -224,6 +224,16 @@ func itimerval(t *kernel.Task, addr usermem.Addr) string {
 	return fmt.Sprintf("%#x {interval=%s, value=%s}", addr, interval, value)
 }
 
+func itimerspec(t *kernel.Task, addr usermem.Addr) string {
+	if addr == 0 {
+		return "null"
+	}
+
+	interval := timespec(t, addr)
+	value := timespec(t, addr+usermem.Addr(binary.Size(linux.Timespec{})))
+	return fmt.Sprintf("%#x {interval=%s, value=%s}", addr, interval, value)
+}
+
 func stringVector(t *kernel.Task, addr usermem.Addr) string {
 	vec, err := t.CopyInVector(addr, slinux.ExecMaxElemSize, slinux.ExecMaxTotalSize)
 	if err != nil {
@@ -296,6 +306,8 @@ func (i *SyscallInfo) pre(t *kernel.Task, args arch.SyscallArguments, maximumBlo
 			output = append(output, utimensTimespec(t, args[arg].Pointer()))
 		case ItimerVal:
 			output = append(output, itimerval(t, args[arg].Pointer()))
+		case ItimerSpec:
+			output = append(output, itimerspec(t, args[arg].Pointer()))
 		case Timeval:
 			output = append(output, timeval(t, args[arg].Pointer()))
 		case Utimbuf:
@@ -362,6 +374,8 @@ func (i *SyscallInfo) post(t *kernel.Task, args arch.SyscallArguments, rval uint
 			output[arg] = timespec(t, args[arg].Pointer())
 		case PostItimerVal:
 			output[arg] = itimerval(t, args[arg].Pointer())
+		case PostItimerSpec:
+			output[arg] = itimerspec(t, args[arg].Pointer())
 		case Timeval:
 			output[arg] = timeval(t, args[arg].Pointer())
 		case Rusage:

pkg/sentry/strace/syscalls.go

@@ -132,10 +132,17 @@ const (
 	// ItimerVal is a pointer to a struct itimerval.
 	ItimerVal
 
-	// ItimerVal is a pointer to a struct itimerval, formatted after
+	// PostItimerVal is a pointer to a struct itimerval, formatted after
 	// syscall execution.
 	PostItimerVal
 
+	// ItimerSpec is a pointer to a struct itimerspec.
+	ItimerSpec
+
+	// PostItimerSpec is a pointer to a struct itimerspec, formatted after
+	// syscall execution.
+	PostItimerSpec
+
 	// Timeval is a pointer to a struct timeval, formatted before and after
 	// syscall execution.
 	Timeval