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// 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")
}
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