1 files changed, 46 insertions, 0 deletions
diff --git a/go/psx-signals.go b/go/psx-signals.go
new file mode 100644
index 0000000..486f284
--- /dev/null
+++ b/go/psx-signals.go
@@ -0,0 +1,46 @@
+// Program psx-signals validates that the psx mechanism can coexist
+// with Go use of signals. This is an unprivilaged program derived
+// from the sample code provided in this bug report:
+//
+//   https://bugzilla.kernel.org/show_bug.cgi?id=210533
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"kernel.org/pub/linux/libs/security/libcap/psx"
+)
+
+const maxSig = 10
+const prSetKeepCaps = 8
+
+func main() {
+	sig := make(chan os.Signal, maxSig)
+	signal.Notify(sig, os.Interrupt)
+
+	fmt.Print("Toggling KEEP_CAPS ")
+	for i := 0; i < maxSig; i++ {
+		fmt.Print(".")
+		_, _, err := psx.Syscall3(syscall.SYS_PRCTL, prSetKeepCaps, uintptr(i&1), 0)
+		if err != 0 {
+			log.Fatalf("[%d] attempt to set KEEPCAPS (to %d) failed: %v", i, i%2, err)
+		}
+	}
+
+	fmt.Println(" done")
+	fmt.Print("Wait 1 second to see if unwanted signals arrive...")
+	// Confirm no signals are delivered.
+	select {
+	case <-time.After(1 * time.Second):
+		break
+	case info := <-sig:
+		log.Fatalf("signal received: %v", info)
+	}
+	fmt.Println(" none arrived")
+	fmt.Println("PASSED")
+}