proc: move out process specific management functions

Move them out of xutils, so that we can maintain them separately.
Also simplify things a bit.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

1 files changed, 66 insertions, 0 deletions

diff --git a/proc.c b/proc.c
new file mode 100644
index 0000000..39d661e
--- /dev/null
+++ b/proc.c
@@ -0,0 +1,66 @@
+#define _GNU_SOURCE
+#include <sched.h>
+#include <sys/types.h>
+#include <sys/resource.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "proc.h"
+#include "die.h"
+
+void cpu_affinity(int cpu)
+{
+	int ret;
+	cpu_set_t cpu_bitmask;
+
+	CPU_ZERO(&cpu_bitmask);
+	CPU_SET(cpu, &cpu_bitmask);
+
+	ret = sched_setaffinity(getpid(), sizeof(cpu_bitmask),
+				&cpu_bitmask);
+	if (ret)
+		panic("Can't set this cpu affinity!\n");
+}
+
+int set_proc_prio(int priority)
+{
+	int ret = setpriority(PRIO_PROCESS, getpid(), priority);
+	if (ret)
+		panic("Can't set nice val to %i!\n", priority);
+
+	return 0;
+}
+
+int set_sched_status(int policy, int priority)
+{
+	int ret, min_prio, max_prio;
+	struct sched_param sp;
+
+	max_prio = sched_get_priority_max(policy);
+	min_prio = sched_get_priority_min(policy);
+
+	if (max_prio == -1 || min_prio == -1)
+		printf("Cannot determine scheduler prio limits!\n");
+	else if (priority < min_prio)
+		priority = min_prio;
+	else if (priority > max_prio)
+		priority = max_prio;
+
+	memset(&sp, 0, sizeof(sp));
+	sp.sched_priority = priority;
+
+	ret = sched_setscheduler(getpid(), policy, &sp);
+	if (ret) {
+		printf("Cannot set scheduler policy!\n");
+		return -EINVAL;
+	}
+
+	ret = sched_setparam(getpid(), &sp);
+	if (ret) {
+		printf("Cannot set scheduler prio!\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}