1 files changed, 76 insertions, 0 deletions
diff --git a/ports/winnt/libntp/setpriority.c b/ports/winnt/libntp/setpriority.c
new file mode 100644
index 0000000..52ab785
--- /dev/null
+++ b/ports/winnt/libntp/setpriority.c
@@ -0,0 +1,76 @@
+#include <config.h>
+#include <stdio.h>
+#include <sys/resource.h>	/* our private version */
+#include "ntp_stdlib.h"
+#include "ntp_syslog.h"
+#include "ntp_debug.h"
+#include "ntp_fp.h"
+#include "ntp.h"
+#include "clockstuff.h"
+
+
+/*
+ * setpriority
+ *
+ * to reduce the #ifdef forest in the portable code,
+ * we emulate the BSD setpriority interface:
+ *
+ * 		if (-1 == setpriority(PRIO_PROCESS, 0, NTP_PRIO))
+ * 			msyslog(LOG_ERR, "setpriority() error: %m");
+ *
+ * However, since the Windows port of ntpd has always raised its
+ * priority (to realtime if allowed, or silently downgraded to 
+ * high by the system if not) with or without -N.  Changing that
+ * now would endanger users who upgrade the binary without adding
+ * -N to its invocation.  Instsrv assumes ntpd.exe is installed
+ * with no command-line arguments.
+ *
+ * This routine is used by utilities as well as ntpd itself, so
+ * it checks if the priority is already high or realtime and 
+ * logs no complaints in that case, to avoid duplicating.  ntpd
+ * will have raised the priority to one of those in
+ * init_winnt_time, while the utilities will rely on this
+ * code.
+ *
+ */
+
+int setpriority(
+		int which,
+		int who,
+		int prio
+		)
+{
+	BOOL success;
+	DWORD prio_class;
+
+	if (PRIO_PROCESS != which || who || NTP_PRIO != prio)
+		TRACE(1, ("windows setpriority() clone needs work.\n"));
+
+	prio_class = GetPriorityClass(GetCurrentProcess());
+	
+	if (HIGH_PRIORITY_CLASS == prio_class ||
+	    REALTIME_PRIORITY_CLASS == prio_class)
+		return 0;
+
+	success = SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
+
+	if (!success) {
+		msyslog(LOG_ERR, "Unable to raise priority: %m"); 
+		errno = EPERM;
+		return -1;
+	}
+
+	prio_class = GetPriorityClass(GetCurrentProcess());
+
+	if (REALTIME_PRIORITY_CLASS == prio_class)
+		msyslog(LOG_INFO, "Raised to realtime priority class");
+	else if (HIGH_PRIORITY_CLASS == prio_class)
+		msyslog(LOG_ERR,  "Raised to high priority class, realtime "
+				  "requires Increase Scheduling Priority "
+				  "privilege (enabled with secpol.msc).");
+	else
+		msyslog(LOG_ERR,  "Unexpected process priority class %d",
+				 prio_class);
+
+	return 0; 
+}