add basic unit test for posix timers (time/timer)

tests/Makefile.tests.mk

@@ -163,6 +163,7 @@ EXPECT_NAMES=\
 	time/strptime \
 	time/time \
 	time/timegm \
+	time/timer \
 	time/tzset \
 	unistd/access \
 	unistd/alarm \

tests/expected/bins_dynamic/time/timer.stdout

@@ -0,0 +1,5 @@
+invalid_timer: ok
+timer_create: ok
+timer_gettime: ok
+timer_settime: ok
+timer_delete: ok

tests/expected/bins_static/time/timer.stdout

@@ -0,0 +1,5 @@
+invalid_timer: ok
+timer_create: ok
+timer_gettime: ok
+timer_settime: ok
+timer_delete: ok

tests/expected/time/timer.stdout

@@ -0,0 +1,5 @@
+invalid_timer: ok
+timer_create: ok
+timer_gettime: ok
+timer_settime: ok
+timer_delete: ok

tests/time/timer.c

@@ -0,0 +1,96 @@
+#include <assert.h>
+#include <signal.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include "test_helpers.h"
+
+static volatile sig_atomic_t alarm_count = 0;
+
+static void handler(int sig) {
+    (void)sig;
+    alarm_count++;
+}
+
+int main(void) {
+    struct sigaction sa;
+    sa.sa_handler = handler;
+    sa.sa_flags = 0;
+    sigemptyset(&sa.sa_mask);
+    int r = sigaction(SIGALRM, &sa, NULL);
+    ERROR_IF(sigaction, r, == -1);
+
+    struct sigevent signal_event = {0};
+    signal_event.sigev_signo = SIGALRM;
+    signal_event.sigev_notify = SIGEV_SIGNAL;
+
+    timer_t timerid = {0};
+    int status = 0;
+    struct itimerspec current_timer_spec = {0};
+    struct itimerspec new_timer_spec = {0};
+    new_timer_spec.it_value.tv_sec = 0;
+    new_timer_spec.it_value.tv_nsec = 5000000; // 5 ms
+
+
+    // use an invalid timer
+    status = timer_gettime(timerid, &current_timer_spec);
+    ERROR_IF(timer_gettime, status, == 0);
+    status = timer_settime(timerid, 0, &new_timer_spec, NULL);
+    ERROR_IF(timer_settime, status, == 0);
+    printf("invalid_timer: ok\n");
+
+    // create a timer
+    status = timer_create(CLOCK_MONOTONIC, &signal_event, &timerid);
+    ERROR_IF(timer_create, status, == -1);
+
+    printf("timer_create: ok\n");
+
+    // check that no timer has been configured yet
+    status = timer_gettime(timerid, &current_timer_spec);
+    ERROR_IF(timer_gettime, status, == -1);
+    assert(current_timer_spec.it_value.tv_sec == 0);
+    assert(current_timer_spec.it_value.tv_nsec == 0);
+
+    printf("timer_gettime: ok\n");
+
+    // start a timer
+    status = timer_settime(timerid, 0, &new_timer_spec, &current_timer_spec);
+    ERROR_IF(timer_settime, status, == -1);
+    // check that there has been no previous timer
+    assert(current_timer_spec.it_value.tv_sec == 0);
+    assert(current_timer_spec.it_value.tv_nsec == 0);
+
+    // timer_gettime reports the timer
+    status = timer_gettime(timerid, &current_timer_spec);
+    assert(current_timer_spec.it_value.tv_sec == 0);
+    assert(current_timer_spec.it_value.tv_nsec > 0);
+    assert(current_timer_spec.it_value.tv_nsec <= 5000000);
+
+    // timer fires
+    usleep(10000); // 10 ms
+    assert(alarm_count == 1);
+
+    // timer_gettime reports no timer any more
+    status = timer_gettime(timerid, &current_timer_spec);
+    assert(current_timer_spec.it_value.tv_sec == 0);
+    assert(current_timer_spec.it_value.tv_nsec == 0);
+
+    printf("timer_settime: ok\n");
+
+    // delete the timer
+    status = timer_delete(timerid);
+    ERROR_IF(timer_delete, status, == -1);
+
+    // any attempts to use the timerid should report EINVAL
+    status = timer_gettime(timerid, &current_timer_spec); // must fail
+    ERROR_IF(timer_delete, status, == 0);
+    assert(errno == EINVAL);
+    status = timer_settime(timerid, 0, &new_timer_spec, &current_timer_spec);
+    ERROR_IF(timer_delete, status, == 0);
+    assert(errno == EINVAL);
+
+    printf("timer_delete: ok\n", status);
+
+    return EXIT_SUCCESS;
+}