diff --git a/libc/Makefile b/libc/Makefile
index ab6573e1..28ef0488 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -161,6 +161,8 @@ wctype.o \
 
 HOSTEDOBJS=\
 access.o \
+alarmns.o \
+alarm.o \
 arpa/inet/inet_addr.o \
 arpa/inet/inet_ntoa.o \
 arpa/inet/inet_ntop.o \
diff --git a/libc/alarm.cpp b/libc/alarm.cpp
new file mode 100644
index 00000000..ad41f115
--- /dev/null
+++ b/libc/alarm.cpp
@@ -0,0 +1,35 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    alarm.cpp
+    Set an alarm clock for delivery of a signal.
+
+*******************************************************************************/
+
+#include <timespec.h>
+#include <unistd.h>
+
+extern "C" unsigned int alarm(unsigned int seconds)
+{
+	struct timespec delay = timespec_make(seconds, 0);
+	struct timespec odelay;
+	if ( alarmns(&delay, &odelay) < 0 )
+		return 0;
+	return odelay.tv_sec + (odelay.tv_nsec ? 1 : 0);
+}
diff --git a/libc/alarmns.cpp b/libc/alarmns.cpp
new file mode 100644
index 00000000..8ded14f5
--- /dev/null
+++ b/libc/alarmns.cpp
@@ -0,0 +1,35 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2013.
+
+    This file is part of the Sortix C Library.
+
+    The Sortix C Library is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or (at your
+    option) any later version.
+
+    The Sortix C Library is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
+
+    alarmns.cpp
+    Set an alarm clock for delivery of a signal.
+
+*******************************************************************************/
+
+#include <sys/syscall.h>
+
+#include <timespec.h>
+#include <unistd.h>
+
+DEFN_SYSCALL2(int, sys_alarmns, SYSCALL_ALARMNS, const struct timespec*, struct timespec*)
+
+extern "C" int alarmns(const struct timespec* delay, struct timespec* odelay)
+{
+	return sys_alarmns(delay, odelay);
+}
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 6ba88921..fe64f5df 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -34,6 +34,10 @@
 #include <stdarg.h>
 #include <stdint.h>
 #include <sortix/fork.h>
+__BEGIN_DECLS
+@include(time_t.h)
+__END_DECLS
+#include <sortix/timespec.h>
 #endif
 #include <sortix/seek.h>
 #include <sortix/unistd.h>
@@ -259,7 +263,6 @@ extern char** environ;
 
 /* TODO: These are not implemented in sortix libc yet. */
 #if defined(__SORTIX_SHOW_UNIMPLEMENTED)
-unsigned alarm(unsigned);
 char* crypt(const char*, const char*);
 char* ctermid(char*);
 void encrypt(char [64], int);
@@ -296,6 +299,7 @@ extern int opterr, optind, optopt;
 #endif
 
 int access(const char*, int);
+unsigned alarm(unsigned);
 int chdir(const char*);
 int chown(const char*, uid_t, gid_t);
 int close(int);
@@ -355,6 +359,7 @@ int unlink(const char*);
 ssize_t write(int, const void*, size_t);
 
 #if defined(_SORTIX_SOURCE)
+int alarmns(const struct timespec* delay, struct timespec* odelay);
 int execvpe(const char*, char* const [], char* const []);
 int getdtablesize(void);
 size_t getpagesize(void);
diff --git a/sortix/Makefile b/sortix/Makefile
index 5c829627..e0eefbae 100644
--- a/sortix/Makefile
+++ b/sortix/Makefile
@@ -72,6 +72,7 @@ LIBS=\
 OBJS=\
 $(CPUOBJS) \
 addralloc.o \
+alarm.o \
 ata.o \
 bga.o \
 calltrace.o \
diff --git a/sortix/alarm.cpp b/sortix/alarm.cpp
new file mode 100644
index 00000000..3d8b3135
--- /dev/null
+++ b/sortix/alarm.cpp
@@ -0,0 +1,73 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
+
+    This file is part of Sortix.
+
+    Sortix is free software: you can redistribute it and/or modify it under the
+    terms of the GNU General Public License as published by the Free Software
+    Foundation, either version 3 of the License, or (at your option) any later
+    version.
+
+    Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+    details.
+
+    You should have received a copy of the GNU General Public License along with
+    Sortix. If not, see <http://www.gnu.org/licenses/>.
+
+    alarm.cpp
+    Sends a signal after a certain amount of time has passed.
+
+*******************************************************************************/
+
+#include <errno.h>
+#include <timespec.h>
+
+#include <sortix/itimerspec.h>
+#include <sortix/signal.h>
+
+#include <sortix/kernel/platform.h>
+#include <sortix/kernel/clock.h>
+#include <sortix/kernel/copy.h>
+#include <sortix/kernel/timer.h>
+#include <sortix/kernel/syscall.h>
+
+#include "process.h"
+
+namespace Sortix {
+namespace Alarm {
+
+static void alarm_handler(Clock* /*clock*/, Timer* /*timer*/, void* user)
+{
+	Process* process = (Process*) user;
+	ScopedLock lock(&process->user_timers_lock);
+	process->DeliverSignal(SIGALRM);
+}
+
+int sys_alarmns(const struct timespec* user_delay, struct timespec* user_odelay)
+{
+	Process* process = CurrentProcess();
+	ScopedLock lock(&process->user_timers_lock);
+
+	struct itimerspec delay, odelay;
+	if ( !CopyFromUser(&delay.it_value, user_delay, sizeof(*user_delay)) )
+		return -1;
+	delay.it_interval = timespec_nul();
+
+	process->alarm_timer.Set(&delay, &odelay, 0, alarm_handler, (void*) process);
+
+	if ( !CopyToUser(user_odelay, &odelay.it_value, sizeof(*user_odelay)) )
+		return -1;
+
+	return 0;
+}
+
+void Init()
+{
+	Syscall::Register(SYSCALL_ALARMNS, (void*) sys_alarmns);
+}
+
+} // namespace Alarm
+} // namespace Sortix
diff --git a/sortix/alarm.h b/sortix/alarm.h
new file mode 100644
index 00000000..5e1d4747
--- /dev/null
+++ b/sortix/alarm.h
@@ -0,0 +1,31 @@
+/*******************************************************************************
+
+    Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
+
+    This file is part of Sortix.
+
+    Sortix is free software: you can redistribute it and/or modify it under the
+    terms of the GNU General Public License as published by the Free Software
+    Foundation, either version 3 of the License, or (at your option) any later
+    version.
+
+    Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
+    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+    FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+    details.
+
+    You should have received a copy of the GNU General Public License along with
+    Sortix. If not, see <http://www.gnu.org/licenses/>.
+
+    alarm.h
+    Sends a signal after a certain amount of time has passed.
+
+*******************************************************************************/
+
+namespace Sortix {
+namespace Alarm {
+
+void Init();
+
+} // namespace Alarm
+} // namespace Sortix
diff --git a/sortix/include/sortix/syscallnum.h b/sortix/include/sortix/syscallnum.h
index 1b90bbe6..43cc3cb3 100644
--- a/sortix/include/sortix/syscallnum.h
+++ b/sortix/include/sortix/syscallnum.h
@@ -123,6 +123,7 @@
 #define SYSCALL_TIMER_GETOVERRUN 99
 #define SYSCALL_TIMER_GETTIME 100
 #define SYSCALL_TIMER_SETTIME 101
-#define SYSCALL_MAX_NUM 102 /* index of highest constant + 1 */
+#define SYSCALL_ALARMNS 102
+#define SYSCALL_MAX_NUM 103 /* index of highest constant + 1 */
 
 #endif
diff --git a/sortix/kernel.cpp b/sortix/kernel.cpp
index d8f43dcf..15b569a3 100644
--- a/sortix/kernel.cpp
+++ b/sortix/kernel.cpp
@@ -65,6 +65,7 @@
 #include "thread.h"
 #include "process.h"
 #include "signal.h"
+#include "alarm.h"
 #include "ata.h"
 #include "com.h"
 #include "uart.h"
@@ -429,6 +430,9 @@ static void BootThread(void* /*user*/)
 	// Initialize per-process timers.
 	UserTimer::Init();
 
+	// Initialize per-process alarm timer.
+	Alarm::Init();
+
 	// Initialize the kernel information query syscall.
 	Info::Init();
 
diff --git a/sortix/process.cpp b/sortix/process.cpp
index 16ee19b7..187895cf 100644
--- a/sortix/process.cpp
+++ b/sortix/process.cpp
@@ -37,6 +37,7 @@
 #include <sortix/kernel/sortedlist.h>
 #include <sortix/kernel/scheduler.h>
 
+#include <sortix/clock.h>
 #include <sortix/signal.h>
 #include <sortix/unistd.h>
 #include <sortix/fcntl.h>
@@ -129,11 +130,14 @@ namespace Sortix
 		pid = AllocatePID();
 		uid = euid = 0;
 		gid = egid = 0;
+		alarm_timer.Attach(Time::GetClock(CLOCK_MONOTONIC));
 		Put(this);
 	}
 
 	Process::~Process()
 	{
+		if ( alarm_timer.IsAttached() )
+			alarm_timer.Detach();
 		if ( program_image_path )
 			delete[] program_image_path;
 		assert(!zombiechild);
@@ -221,6 +225,18 @@ namespace Sortix
 		((Thread*) user)->SwitchAddressSpace(addrspace);
 	}
 
+	void Process::DeleteTimers()
+	{
+		for ( timer_t i = 0; i < PROCESS_TIMER_NUM_MAX; i++ )
+		{
+			if ( user_timers[i].timer.IsAttached() )
+			{
+				user_timers[i].timer.Cancel();
+				user_timers[i].timer.Detach();
+			}
+		}
+	}
+
 	void Process::LastPrayer()
 	{
 		assert(this);
@@ -236,13 +252,11 @@ namespace Sortix
 		assert(!firstthread);
 
 		// Disarm and detach all the timers in the process.
-		for ( timer_t i = 0; i < PROCESS_TIMER_NUM_MAX; i++ )
+		DeleteTimers();
+		if ( alarm_timer.IsAttached() )
 		{
-			if ( user_timers[i].timer.IsAttached() )
-			{
-				user_timers[i].timer.Cancel();
-				user_timers[i].timer.Detach();
-			}
+			alarm_timer.Cancel();
+			alarm_timer.Detach();
 		}
 
 		// We need to temporarily reload the correct addrese space of the dying
@@ -617,6 +631,8 @@ namespace Sortix
 	{
 		// TODO: Delete all threads and their stacks.
 
+		DeleteTimers();
+
 		ResetAddressSpace();
 	}
 
diff --git a/sortix/process.h b/sortix/process.h
index 49f7be67..1a5b4c6f 100644
--- a/sortix/process.h
+++ b/sortix/process.h
@@ -145,6 +145,7 @@ namespace Sortix
 	public:
 		kthread_mutex_t user_timers_lock;
 		UserTimer user_timers[PROCESS_TIMER_NUM_MAX];
+		Timer alarm_timer;
 
 	public:
 		int Execute(const char* programname, const uint8_t* program,
@@ -172,6 +173,7 @@ namespace Sortix
 		void LastPrayer();
 		void NotifyChildExit(Process* child, bool zombify);
 		void NotifyNewZombies();
+		void DeleteTimers();
 
 	public:
 		void ResetForExecute();