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// +build cgo
package psx
import (
"runtime"
"syscall"
"testing"
)
// The man page for errno indicates that it is never set to zero, so
// validate that it retains its value over a successful Syscall[36]()
// and is overwritten on a failing syscall.
func TestErrno(t *testing.T) {
// This testing is much easier if we don't have to guess which
// thread is running this Go code.
runtime.LockOSThread()
defer runtime.UnlockOSThread()
// Start from a known bad state and clean up afterwards.
setErrno(int(syscall.EPERM))
defer setErrno(0)
v3, _, errno := Syscall3(syscall.SYS_GETUID, 0, 0, 0)
if errno != 0 {
t.Fatalf("psx getuid failed: %v", errno)
}
v6, _, errno := Syscall6(syscall.SYS_GETUID, 0, 0, 0, 0, 0, 0)
if errno != 0 {
t.Fatalf("psx getuid failed: %v", errno)
}
if v3 != v6 {
t.Errorf("psx getuid failed to match v3=%d, v6=%d", v3, v6)
}
if v := setErrno(-1); v != int(syscall.EPERM) {
t.Errorf("psx changes prevailing errno got=%v(%d) want=%v", syscall.Errno(v), v, syscall.EPERM)
}
}
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