libc/poll: add select() errno test

JIRA: RTOS-945

libc/Makefile

@@ -43,3 +43,4 @@ $(eval $(call add_test_libc,math, -lm, -ffloat-store)) # -ffloat-store - prevent
 # -Wno-attribute-warning - ignore warning when using sendmsg/recvmsg, we know it's not fully supported
 $(eval $(call add_test_libc_custom,socket,inet-socket,, -Wno-attribute-warning, inet-socket.c common.c))
 $(eval $(call add_test_libc_custom,socket,unix-socket,, -Wno-attribute-warning, unix-socket.c common.c))
+$(eval $(call add_test_libc,poll))

libc/poll/poll.c

@@ -0,0 +1,126 @@
+/*
+ * Phoenix-RTOS
+ *
+ * test-libc-poll
+ *
+ * poll tests
+ *
+ * Copyright 2024 Phoenix Systems
+ * Author: Adam Greloch
+ *
+ * This file is part of Phoenix-RTOS.
+ *
+ * %LICENSE%
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/select.h>
+#include <time.h>
+
+#include "unity_fixture.h"
+
+
+#define MS_BETWEEN(ts0, ts1) \
+	((ts1).tv_sec - (ts0).tv_sec) * 1000 + ((ts1).tv_nsec - (ts0).tv_nsec) / 1000000;
+
+
+TEST_GROUP(test_poll);
+
+
+TEST_SETUP(test_poll)
+{
+}
+
+
+TEST_TEAR_DOWN(test_poll)
+{
+}
+
+
+static int get_bad_fd(int min_num, int max_num)
+{
+	int rv, fd;
+	for (fd = min_num; fd <= max_num; fd++) {
+		rv = fcntl(fd, F_GETFD);
+		if (rv < 0) {
+			return fd;
+		}
+	}
+	return -1;
+}
+
+
+TEST(test_poll, select_errnos)
+{
+	fd_set rfds;
+	struct timeval tv;
+	struct timespec ts[2];
+	int rv, ms, bad_fd;
+
+	tv.tv_sec = 0;
+	tv.tv_usec = 300 * 1000;
+	FD_ZERO(&rfds);
+	FD_SET(STDIN_FILENO, &rfds);
+	clock_gettime(CLOCK_REALTIME, &ts[0]);
+	rv = select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv);
+	clock_gettime(CLOCK_REALTIME, &ts[1]);
+	ms = MS_BETWEEN(ts[0], ts[1]);
+	TEST_ASSERT(rv == 0);
+	TEST_ASSERT_EQUAL_INT(0, FD_ISSET(STDIN_FILENO, &rfds));
+	TEST_ASSERT_LESS_THAN(350, ms);
+	TEST_ASSERT_GREATER_THAN(290, ms);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = 1000;
+	FD_ZERO(&rfds);
+	FD_SET(STDIN_FILENO, &rfds);
+	errno = 0;
+	rv = select(-1, &rfds, NULL, NULL, &tv);
+	TEST_ASSERT_EQUAL_INT(-1, rv);
+	TEST_ASSERT_EQUAL_INT(EINVAL, errno);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = -1;
+	FD_ZERO(&rfds);
+	FD_SET(STDIN_FILENO, &rfds);
+	errno = 0;
+	rv = select(STDIN_FILENO + 1, &rfds, NULL, NULL, &tv);
+	TEST_ASSERT_EQUAL_INT(-1, rv);
+	TEST_ASSERT_EQUAL_INT(EINVAL, errno);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = 1000;
+	bad_fd = get_bad_fd(0, 1024);
+	if (bad_fd < 0) {
+		FAIL("get_bad_fd");
+	}
+	FD_ZERO(&rfds);
+	FD_SET(bad_fd, &rfds);
+	errno = 0;
+	rv = select(FD_SETSIZE, &rfds, NULL, NULL, &tv);
+	TEST_ASSERT_EQUAL_INT(-1, rv);
+	TEST_ASSERT_EQUAL_INT(EBADF, errno);
+}
+
+
+TEST_GROUP_RUNNER(test_poll)
+{
+	RUN_TEST_CASE(test_poll, select_errnos);
+}
+
+
+static void runner(void)
+{
+	RUN_TEST_GROUP(test_poll);
+}
+
+
+int main(int argc, char *argv[])
+{
+	int failures = UnityMain(argc, (const char **)argv, runner);
+
+	return (failures == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
+}