fix(tests): check PinProccessToCPU err

tests/integration/syscaller/cmd/syscaller.go

@@ -11,7 +11,11 @@ import (
 )
 
 func main() {
-	testutils.PinProccessToCPU()
+	err := testutils.PinProccessToCPU()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "PinProccessToCPU: %v\n", err)
+		os.Exit(1)
+	}
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
@@ -31,7 +35,7 @@ func main() {
 		syscallsToCall = append(syscallsToCall, events.ID(syscallNum))
 	}
 
-	err := changeOwnComm(callerComm)
+	err = changeOwnComm(callerComm)
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "%v\n", err)
 		os.Exit(1)

tests/testutils/cpu.go

@@ -7,7 +7,7 @@ import (
 const CPUForTests = 0 // CPU to pin test processes to
 
 // PinProccessToCPU pins the current process to a specific CPU
-func PinProccessToCPU(id ...int) {
+func PinProccessToCPU(id ...int) error {
 	if len(id) == 0 {
 		id = append(id, CPUForTests)
 	}
@@ -16,5 +16,6 @@ func PinProccessToCPU(id ...int) {
 	for _, i := range id {
 		cpuMask.Set(i)
 	}
-	_ = unix.SchedSetaffinity(0, &cpuMask)
+
+	return unix.SchedSetaffinity(0, &cpuMask)
 }

tests/testutils/errors.go

@@ -52,6 +52,16 @@ func (e *commandFailed) Error() string {
 	return fmt.Sprintf("command '%s' failed with error: %s", e.command, e.err)
 }
 
+// failedToPinProcessToCPU is returned when a command fails to pin to a CPU.
+type failedToPinProcessToCPU struct {
+	command string
+	err     error
+}
+
+func (e *failedToPinProcessToCPU) Error() string {
+	return fmt.Sprintf("failed to pin command '%s' to CPU: %s", e.command, e.err)
+}
+
 // failedToParseCmd is returned when a command fails to parse.
 type failedToParseCmd struct {
 	command string

tests/testutils/exec.go

@@ -49,7 +49,10 @@ func ParseCmd(fullCmd string) (string, []string, error) {
 
 // ExecPinnedCmdWithTimeout executes a cmd with a timeout and returns the PID of the process.
 func ExecPinnedCmdWithTimeout(command string, timeout time.Duration) (int, error) {
-	PinProccessToCPU()             // pin this goroutine to a specific CPU
+	err := PinProccessToCPU() // pin this goroutine to a specific CPU
+	if err != nil {
+		return 0, &failedToPinProcessToCPU{command: command, err: err}
+	}
 	runtime.LockOSThread()         // wire this goroutine to a specific OS thread
 	defer runtime.UnlockOSThread() // unlock the thread when we're done