Add itimer-related syscall tests

regression/apps/Makefile

@@ -22,6 +22,7 @@ TEST_APPS := \
 	hello_c \
 	hello_pie \
 	hello_world \
+	itimer \
 	mmap \
 	mongoose \
 	network \

regression/apps/itimer/Makefile

@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: MPL-2.0
+
+include ../test_common.mk
+
+EXTRA_C_FLAGS :=

regression/apps/itimer/setitimer.c

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <string.h>
+
+volatile sig_atomic_t counter = 0;
+
+void timer_handler(int signum)
+{
+	counter++;
+}
+
+int main()
+{
+	struct itimerval timer;
+	struct sigaction sa;
+	int target_count = 3;
+	struct timespec start_time, end_time;
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = &timer_handler;
+	sa.sa_flags = SA_RESTART;
+	sigaction(SIGALRM, &sa, NULL);
+
+	// Set the interval to 1.
+	timer.it_value.tv_sec = 1;
+	timer.it_value.tv_usec = 0;
+	timer.it_interval.tv_sec = 1;
+	timer.it_interval.tv_usec = 0;
+
+	// Start timer.
+	if (setitimer(ITIMER_REAL, &timer, NULL) == -1) {
+		perror("Error calling setitimer()");
+		return EXIT_FAILURE;
+	}
+
+	if (clock_gettime(CLOCK_REALTIME, &start_time) == -1) {
+		perror("Error calling clock_gettime()");
+		return EXIT_FAILURE;
+	}
+
+	while (counter < target_count) {
+		struct itimerval timer_state;
+		if (getitimer(ITIMER_REAL, &timer_state) == -1) {
+			perror("Error calling getitimer()");
+			return EXIT_FAILURE;
+		}
+
+		if (timer_state.it_interval.tv_sec == 1 &&
+		    timer_state.it_value.tv_sec == 0) {
+			sleep(1);
+		} else {
+			perror("Error record time in the timer");
+			return EXIT_FAILURE;
+		}
+	}
+
+	timer.it_value.tv_sec = 0;
+	timer.it_value.tv_usec = 0;
+	timer.it_interval.tv_sec = 0;
+	timer.it_interval.tv_usec = 0;
+	// Stop timer.
+	if (setitimer(ITIMER_REAL, &timer, NULL) == -1) {
+		perror("Error calling setitimer()");
+		return EXIT_FAILURE;
+	}
+
+	if (clock_gettime(CLOCK_REALTIME, &end_time) == -1) {
+		perror("Error calling clock_gettime()");
+		return EXIT_FAILURE;
+	}
+
+	int elapsed_time = (int)(end_time.tv_sec - start_time.tv_sec);
+
+	printf("Timer was set to go off every second for a total of %d times.\n",
+	       target_count);
+	printf("Elapsed time: %d seconds.\n", elapsed_time);
+
+	if (elapsed_time == target_count) {
+		printf("The actual elapsed time matches the expected time.\n");
+	} else {
+		printf("There is a discrepancy between actual and expected time.\n");
+	}
+
+	return EXIT_SUCCESS;
+}

regression/apps/itimer/timer_create.c

@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <time.h>
+#include <sys/syscall.h>
+#include <linux/types.h>
+#include <string.h>
+
+#define CLOCKID CLOCK_REALTIME
+#define SIG SIGRTMIN
+
+static void handler(int sig, siginfo_t *si, void *unused)
+{
+	printf("Caught signal %d\n", sig);
+}
+
+int main(int argc, char *argv[])
+{
+	struct sigaction sa;
+	struct sigevent sev;
+	timer_t timerid;
+	struct itimerspec its;
+	memset(&sa, 0, sizeof(sa));
+
+	// Set signal handler
+	sa.sa_flags = SA_SIGINFO;
+	sa.sa_sigaction = handler;
+	sigemptyset(&sa.sa_mask);
+	if (sigaction(SIG, &sa, NULL) == -1) {
+		perror("sigaction");
+		exit(1);
+	}
+
+	// Create the timer.
+	sev.sigev_notify = SIGEV_THREAD_ID;
+	sev.sigev_signo = SIG;
+	sev.sigev_value.sival_ptr = &timerid;
+	sev._sigev_un._tid = syscall(SYS_gettid);
+	if (timer_create(CLOCKID, &sev, &timerid) == -1) {
+		perror("timer_create");
+		exit(1);
+	}
+
+	// Enable the timer.
+	its.it_value.tv_sec = 5;
+	its.it_value.tv_nsec = 0;
+	its.it_interval.tv_sec = 0;
+	its.it_interval.tv_nsec = 0;
+	if (timer_settime(timerid, 0, &its, NULL) == -1) {
+		perror("timer_settime");
+		exit(1);
+	}
+
+	pause();
+
+	return 0;
+}

regression/apps/scripts/process.sh

@@ -18,6 +18,8 @@ fork_c/fork
 getpid/getpid
 hello_pie/hello
 hello_world/hello_world
+itimer/setitimer
+itimer/timer_create
 mmap/map_shared_anon
 pthread/pthread_test
 pty/open_pty

regression/syscall_test/Makefile

@@ -29,6 +29,7 @@ TESTS ?= \
 	statfs_test \
 	symlink_test \
 	sync_test \
+	timers_test \
 	truncate_test \
 	uidgid_test \
 	unlink_test \

regression/syscall_test/blocklists/timers_test

@@ -0,0 +1,9 @@
+TimerTest.ProcessKilledOnCPUSoftLimit
+TimerTest.ProcessPingedRepeatedlyAfterCPUSoftLimit
+TimerTest.ProcessKilledOnCPUHardLimit
+IntervalTimerTest.SingleShotSilent
+IntervalTimerTest.PeriodicSilent
+IntervalTimerTest.PeriodicThreadDirectedSignal
+IntervalTimerTest.RealTimeSignalsAreNotDuplicated
+IntervalTimerTest.AlreadyPendingSignal
+IntervalTimerTest.IgnoredSignalCountsAsOverrun