syscalls: fchdir, setitimer, getitimer

kernel-src/include/kernel/itimer.h

@@ -0,0 +1,23 @@
+#ifndef _ITIMER_H
+#define _ITIMER_H
+
+#include <kernel/dpc.h>
+#include <kernel/timer.h>
+
+typedef struct {
+	struct cpu_t *cpu;
+	timerentry_t entry;
+	uintmax_t remainingus;
+	uintmax_t repeatus;
+	dpcfn_t fn;
+	dpcarg_t arg;
+	bool paused;
+	spinlock_t lock;
+} itimer_t;
+
+void itimer_init(itimer_t *itimer, dpcfn_t fn, dpcarg_t arg);
+void itimer_pause(itimer_t *itimer, uintmax_t *remainingus, uintmax_t *repeatus);
+void itimer_set(itimer_t *itimer, uintmax_t timerus, uintmax_t repeatus);
+void itimer_resume(itimer_t *itimer);
+
+#endif

kernel-src/include/kernel/scheduler.h

@@ -8,6 +8,7 @@
 #include <semaphore.h>
 #include <mutex.h>
 #include <kernel/signal.h>
+#include <kernel/itimer.h>
 
 #define SCHED_THREAD_FLAGS_QUEUED 1
 #define SCHED_THREAD_FLAGS_RUNNING 2
@@ -112,6 +113,13 @@ typedef struct proc_t {
 		bool stopunwaited;
 		bool continueunwaited;
 	} signals;
+
+	struct {
+		mutex_t mutex;
+		itimer_t realtime;
+		itimer_t virtualtime;
+		itimer_t profiling;
+	} timer;
 } proc_t;
 
 #include <arch/cpu.h>

kernel-src/include/time.h

@@ -4,12 +4,18 @@
 #include <util.h>
 
 typedef long time_t;
+typedef long suseconds_t;
 
 typedef struct {
 	time_t s;
 	time_t ns;
 } timespec_t;
 
+typedef struct {
+	time_t s;
+	suseconds_t us;
+} timeval_t;
+
 static inline timespec_t timespec_add(timespec_t a, timespec_t b) {
 	timespec_t ts;
 	ts.ns = (a.ns + b.ns) % 1000000000;