Add syscall eventfd and eventfd2

regression/apps/Makefile

@@ -11,6 +11,7 @@ REGRESSION_BUILD_DIR ?= $(INITRAMFS)/regression
 # These test apps are sorted by name
 TEST_APPS := \
 	execve \
+	eventfd2 \
 	fork \
 	fork_c \
 	getpid \

regression/apps/eventfd2/Makefile

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

regression/apps/eventfd2/eventfd2.c

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: MPL-2.0
+
+#include <err.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+int main()
+{
+	int efd;
+	uint64_t u;
+	ssize_t s;
+
+	uint64_t values[] = { 11, 222, 3333 };
+	size_t length = sizeof(values) / sizeof(values[0]);
+
+	efd = eventfd(0, 0);
+	if (efd == -1)
+		err(EXIT_FAILURE, "eventfd");
+
+	switch (fork()) {
+	case 0:
+		for (size_t j = 0; j < length; j++) {
+			printf("Child writing %ld to efd\n", values[j]);
+			u = values[j]; /* strtoull() allows various bases */
+			s = write(efd, &u, sizeof(uint64_t));
+			if (s != sizeof(uint64_t))
+				err(EXIT_FAILURE, "write");
+		}
+
+		printf("Child completed write loop\n");
+
+		exit(EXIT_SUCCESS);
+
+	default:
+		sleep(2);
+
+		printf("Parent about to read\n");
+		s = read(efd, &u, sizeof(uint64_t));
+		if (s != sizeof(uint64_t))
+			err(EXIT_FAILURE, "read");
+		printf("Parent read %" PRIu64 " (%#" PRIx64 ") from efd\n", u,
+		       u);
+		if (u != 11 + 222 + 3333) {
+			err(EXIT_FAILURE, "read eventfd");
+			exit(EXIT_FAILURE);
+		}
+		exit(EXIT_SUCCESS);
+
+	case -1:
+		err(EXIT_FAILURE, "fork");
+	}
+}

regression/apps/scripts/process.sh

@@ -8,7 +8,7 @@ SCRIPT_DIR=/regression
 cd ${SCRIPT_DIR}/..
 
 echo "Start process test......"
-tests="hello_world/hello_world fork/fork execve/execve fork_c/fork signal_c/signal_test pthread/pthread_test hello_pie/hello pty/open_pty getpid/getpid"
+tests="hello_world/hello_world fork/fork execve/execve fork_c/fork signal_c/signal_test pthread/pthread_test hello_pie/hello pty/open_pty getpid/getpid eventfd2/eventfd2"
 for testcase in ${tests}
 do 
     echo "Running test ${testcase}......"

regression/syscall_test/Makefile

@@ -11,6 +11,7 @@ TESTS ?= \
 	chown_test \
 	chroot_test \
 	epoll_test \
+	eventfd_test \
 	fsync_test \
 	getdents_test \
 	link_test \

regression/syscall_test/blocklists/eventfd_test

@@ -0,0 +1,3 @@
+EventfdTest.IllegalPwrite
+EventfdTest.SpliceFromPipePartialSucceeds
+EventfdTest.NotifyNonZero_NoRandomSave