Add a basic test for evdev into CI

test/src/apps/devfs/evdev.c

@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../test.h"
+
+#define INPUT_DIR "/dev/input"
+#define MAX_EVDEV_DEVICES 16
+
+static int evdev_fds[MAX_EVDEV_DEVICES];
+static size_t evdev_count = 0;
+
+static void cleanup_open_fds(DIR *dir)
+{
+	if (dir) {
+		closedir(dir);
+	}
+	for (size_t i = 0; i < evdev_count; ++i) {
+		close(evdev_fds[i]);
+	}
+}
+
+FN_SETUP(open_evdev)
+{
+	DIR *dir = opendir(INPUT_DIR);
+	if (!dir) {
+		if (errno == ENOENT || errno == ENODEV || errno == ENXIO) {
+			fprintf(stderr, "evdev tests skipped: %s (%s)\n",
+				INPUT_DIR, strerror(errno));
+			exit(EXIT_SUCCESS);
+		}
+		fprintf(stderr,
+			"fatal error: setup_open_evdev: opendir('%s') failed: %s\n",
+			INPUT_DIR, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	struct dirent *entry;
+	while ((entry = readdir(dir)) != NULL) {
+		if (strncmp(entry->d_name, "event", 5) != 0) {
+			continue;
+		}
+
+		if (evdev_count >= MAX_EVDEV_DEVICES) {
+			cleanup_open_fds(dir);
+			fprintf(stderr,
+				"fatal error: setup_open_evdev: too many event devices (max %d)\n",
+				MAX_EVDEV_DEVICES);
+			exit(EXIT_FAILURE);
+		}
+
+		char path[PATH_MAX];
+		int len = snprintf(path, sizeof(path), "%s/%s", INPUT_DIR,
+				   entry->d_name);
+		if (len < 0 || len >= (int)sizeof(path)) {
+			cleanup_open_fds(dir);
+			fprintf(stderr,
+				"fatal error: setup_open_evdev: path too long\n");
+			exit(EXIT_FAILURE);
+		}
+
+		int fd = open(path, O_RDONLY);
+		if (fd < 0) {
+			int saved = errno;
+			cleanup_open_fds(dir);
+			fprintf(stderr,
+				"fatal error: setup_open_evdev: open('%s') failed: %s\n",
+				path, strerror(saved));
+			exit(EXIT_FAILURE);
+		}
+
+		evdev_fds[evdev_count++] = fd;
+	}
+
+	closedir(dir);
+
+	if (evdev_count == 0) {
+		fprintf(stderr,
+			"evdev tests skipped: no event devices found in %s\n",
+			INPUT_DIR);
+		exit(EXIT_SUCCESS);
+	}
+}
+END_SETUP()
+
+// TODO: Currently this test is meaningless.
+// It is a placeholder for future tests (e.g., for ioctl commands).
+FN_TEST(open_close)
+{
+	TEST_RES(evdev_count > 0, _ret == 1);
+	for (size_t i = 0; i < evdev_count; ++i) {
+		TEST_RES(evdev_fds[i] >= 0, _ret == 1);
+	}
+}
+END_TEST()
+
+FN_SETUP(close_evdev)
+{
+	for (size_t i = 0; i < evdev_count; ++i) {
+		CHECK(close(evdev_fds[i]));
+	}
+}
+END_SETUP()

test/src/apps/scripts/fs.sh

@@ -106,3 +106,4 @@ file_io/access_err
 file_io/iovec_err
 devfs/full
 devfs/random
+devfs/evdev