Enforce `Werror` for all tests (again)

test/src/apps/devfs/full.c

@@ -37,8 +37,12 @@ FN_TEST(read)
 		 _ret == READ_SIZE &&
 			 memcmp(buffer, all_zeros, READ_SIZE) == 0);
 	TEST_RES(read(fd, buffer, 0), _ret == 0);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnonnull"
 	TEST_ERRNO(read(fd, NULL, 1), EFAULT);
 	TEST_RES(read(fd, NULL, 0), _ret == 0);
+#pragma GCC diagnostic pop
 }
 END_TEST()
 
@@ -46,15 +50,19 @@ FN_TEST(write)
 {
 	TEST_ERRNO(write(fd, buffer, 1), ENOSPC);
 	TEST_ERRNO(write(fd, buffer, 0), ENOSPC);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnonnull"
 	TEST_ERRNO(write(fd, NULL, 1), ENOSPC);
 	TEST_ERRNO(write(fd, NULL, 0), ENOSPC);
+#pragma GCC diagnostic pop
 }
 END_TEST()
 
 FN_TEST(poll)
 {
 	struct pollfd pfd = { .fd = fd, .events = POLLIN | POLLOUT };
-	TEST_RES(poll(&pfd, 1, 0), pfd.revents == POLLIN | POLLOUT);
+	TEST_RES(poll(&pfd, 1, 0), pfd.revents == (POLLIN | POLLOUT));
 }
 END_TEST()
 

test/src/apps/epoll/epoll_pwait.c

@@ -11,7 +11,7 @@
 // Signal handler for SIGUSR1
 static void handle_sigusr1(int sig)
 {
-	write(STDOUT_FILENO, "SIGUSR1 handled\n", 16);
+	(void)!write(STDOUT_FILENO, "SIGUSR1 handled\n", 16);
 }
 
 int main(void)
@@ -47,8 +47,8 @@ int main(void)
 		sleep(3); // Sleep for several seconds to provide a time window to send SIGUSR1
 
 		const char *message = "Message from child process\n";
-		write(pipefd[1], message,
-		      strlen(message)); // Write a string to the pipe
+		(void)!write(pipefd[1], message,
+			     strlen(message)); // Write a string to the pipe
 		close(pipefd[1]); // Close write end of the pipe
 		_exit(EXIT_SUCCESS);
 	} else {

test/src/apps/epoll/epoll_wait.c

@@ -42,8 +42,8 @@ int main(void)
 	if (cpid == 0) { // Child process
 		close(pipefd[0]); // Child closes read end of the pipe
 		const char *message = "Hello, world!\n";
-		write(pipefd[1], message,
-		      strlen(message)); // Write a string to the pipe
+		(void)!write(pipefd[1], message,
+			     strlen(message)); // Write a string to the pipe
 		close(pipefd[1]); // Close write end of the pipe
 		_exit(EXIT_SUCCESS);
 	} else { // Parent process

test/src/apps/file_io/access_err.c

@@ -118,7 +118,6 @@ FN_TEST(writeable)
 {
 	int fd;
 	char buf[1];
-	void *addr;
 
 	// Test 1: Normal file
 
@@ -164,7 +163,6 @@ FN_TEST(path)
 {
 	int fd;
 	char buf[1];
-	void *addr;
 
 	// Test 1: Normal file
 

test/src/apps/mmap/mmap_shared_filebacked.c

@@ -39,7 +39,7 @@ void verify_file_contents(const char *path, const char *expected_content)
 	}
 
 	char buffer[FILE_SIZE] = { 0 };
-	fread(buffer, 1, FILE_SIZE, file);
+	(void)!fread(buffer, 1, FILE_SIZE, file);
 	fclose(file);
 
 	if (strstr(buffer, expected_content) != NULL) {

test/src/apps/namespace/mnt_ns.c

@@ -29,7 +29,7 @@ static int unshare_child_fn(void)
 
 	CHECK(umount(UNSHARE_MNT));
 
-	CHECK_WITH(access(UNSHARE_FILE, F_OK), errno == ENOENT);
+	CHECK_WITH(access(UNSHARE_FILE, F_OK), _ret == -1 && errno == ENOENT);
 
 	return 0;
 }
@@ -37,8 +37,8 @@ static int unshare_child_fn(void)
 FN_TEST(unshare_newns)
 {
 	// Setup
-	CHECK_WITH(mkdir("/mnt", 0755), errno == 0 | errno == EEXIST);
-	CHECK_WITH(mkdir(UNSHARE_MNT, 0755), errno == 0 | errno == EEXIST);
+	CHECK_WITH(mkdir("/mnt", 0755), _ret >= 0 || errno == EEXIST);
+	CHECK_WITH(mkdir(UNSHARE_MNT, 0755), _ret >= 0 || errno == EEXIST);
 
 	TEST_ERRNO(access(UNSHARE_FILE, F_OK), ENOENT);
 
@@ -88,9 +88,9 @@ static int clone_child_fn(void *arg)
 FN_TEST(clone_newns)
 {
 	// Setup
-	CHECK_WITH(mkdir("/mnt", 0755), errno == 0 | errno == EEXIST);
-	CHECK_WITH(mkdir(CLONE_PARENT_MNT, 0755), errno == 0 | errno == EEXIST);
-	CHECK_WITH(mkdir(CLONE_CHILD_MNT, 0755), errno == 0 | errno == EEXIST);
+	CHECK_WITH(mkdir("/mnt", 0755), _ret >= 0 || errno == EEXIST);
+	CHECK_WITH(mkdir(CLONE_PARENT_MNT, 0755), _ret >= 0 || errno == EEXIST);
+	CHECK_WITH(mkdir(CLONE_CHILD_MNT, 0755), _ret >= 0 || errno == EEXIST);
 
 	TEST_SUCC(mount("ramfs_parent", CLONE_PARENT_MNT, "ramfs", 0, ""));
 	int fd = TEST_SUCC(open(PARENT_FILE, O_CREAT | O_WRONLY, 0644));
@@ -147,8 +147,8 @@ static int setns_target_fn(int pipe_write_fd)
 FN_TEST(setns_newns)
 {
 	// Setup
-	CHECK_WITH(mkdir("/mnt", 0755), errno == 0 | errno == EEXIST);
-	CHECK_WITH(mkdir(SETNS_MNT, 0755), errno == 0 | errno == EEXIST);
+	CHECK_WITH(mkdir("/mnt", 0755), _ret >= 0 || errno == EEXIST);
+	CHECK_WITH(mkdir(SETNS_MNT, 0755), _ret >= 0 || errno == EEXIST);
 
 	int pipefd[2];
 	TEST_SUCC(pipe(pipefd));

test/src/apps/namespace/unshare.c

@@ -1,12 +1,9 @@
 // SPDX-License-Identifier: MPL-2.0
 
 #define _GNU_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
 #include <unistd.h>
 #include <sched.h>
 #include <sys/stat.h>
-#include <errno.h>
 #include <pthread.h>
 #include <fcntl.h>
 
@@ -31,6 +28,8 @@ END_TEST()
 void *sleep_1s_thread(void *arg)
 {
 	sleep(1);
+
+	return NULL;
 }
 
 FN_TEST(single_thread_flags)
@@ -58,6 +57,8 @@ void *unshare_files_thread(void *arg)
 
 	CHECK(unshare(CLONE_FILES));
 	CHECK(close(test_fd));
+
+	return NULL;
 }
 
 FN_TEST(unshare_files)
@@ -106,6 +107,8 @@ void *unshare_fs_thread(void *arg)
 
 	CHECK(chdir(THREAD_CWD));
 	CHECK(getcwd((char *)arg, CWD_BUF_SIZE));
+
+	return NULL;
 }
 
 FN_TEST(unshare_fs)

test/src/apps/network/tcp_client.c

@@ -40,7 +40,7 @@ int main()
 	// Send message to the server and receive the reply
 	send(sock, hello, strlen(hello), 0);
 	printf("Hello message sent\n");
-	read(sock, buffer, 1024);
+	(void)!read(sock, buffer, 1024);
 	printf("Server: %s\n", buffer);
 	return 0;
 }

test/src/apps/network/tcp_server.c

@@ -60,7 +60,7 @@ int main()
 	}
 
 	// Read the message from the client and reply
-	read(new_socket, buffer, 1024);
+	(void)!read(new_socket, buffer, 1024);
 	printf("Client: %s\n", buffer);
 	send(new_socket, hello, strlen(hello), 0);
 	printf("Hello message sent\n");

test/src/apps/network/unix_datagram_err.c

@@ -230,7 +230,6 @@ END_TEST()
 
 FN_TEST(blocking_recv)
 {
-	int i;
 	int sk1, sk2;
 	int pid;
 	char buf[20];

test/src/apps/network/unix_server.c

@@ -63,7 +63,7 @@ int main()
 
 	printf("Server is connected to client\n");
 	char *mesg = "Hello from unix socket server";
-	write(accepted_fd, mesg, strlen(mesg));
+	(void)!write(accepted_fd, mesg, strlen(mesg));
 
 	// Read data from the client
 	memset(buf, 0, BUFFER_SIZE);

test/src/apps/pseudofs/memfd_access_err.c

@@ -30,8 +30,8 @@ FN_TEST(path)
 {
 	int fd = TEST_SUCC(open(memfd_path, O_PATH | O_RDWR));
 	char buf[10];
-	int flags =
-		TEST_RES(fcntl(fd, F_GETFL), (_ret & O_ACCMODE) == O_RDONLY);
+
+	TEST_RES(fcntl(fd, F_GETFL), (_ret & O_ACCMODE) == O_RDONLY);
 
 	TEST_ERRNO(fcntl(fd, F_ADD_SEALS, F_SEAL_SEAL), EBADF);
 	TEST_ERRNO(fcntl(fd, F_GET_SEALS), EBADF);

test/src/apps/signal_c/sigaltstack.c

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: MPL-2.0
 
 #define _GNU_SOURCE
-#include <stdio.h>
 #include <stdlib.h>
 #include <signal.h>
 #include <ucontext.h>
@@ -18,7 +17,7 @@
 #define SS_AUTODISARM (1 << 31)
 #endif
 
-static volatile void *g_alt_stack_base = NULL;
+static void *volatile g_alt_stack_base = NULL;
 static volatile int recursion_level = 0;
 static volatile bool sigstack_enabled = false;
 static volatile int stack_flags = 0;
@@ -69,7 +68,9 @@ void signal_handler(int sig, siginfo_t *info, void *ucontext)
 	CHECK(on_sig_stack(uc));
 
 	if (recursion_level == 1) {
-		CHECK(sigaltstack(NULL, &old_stack));
+		stack_t old_stack_tmp;
+		CHECK(sigaltstack(NULL, &old_stack_tmp));
+		old_stack = old_stack_tmp;
 	}
 
 	if (recursion_level <= 3) {
@@ -214,12 +215,12 @@ FN_TEST(stack_flags_in_uc_context)
 	alt_stack.ss_flags = SS_ONSTACK | SS_AUTODISARM;
 	TEST_SUCC(sigaltstack(&alt_stack, NULL));
 	TEST_RES(raise(SIGUSR2),
-		 current_stack.ss_flags == SS_ONSTACK | SS_AUTODISARM);
+		 current_stack.ss_flags == (SS_ONSTACK | SS_AUTODISARM));
 
 	alt_stack.ss_flags = SS_DISABLE | SS_AUTODISARM;
 	TEST_SUCC(sigaltstack(&alt_stack, NULL));
 	TEST_RES(raise(SIGUSR2),
-		 current_stack.ss_flags == SS_DISABLE | SS_AUTODISARM);
+		 current_stack.ss_flags == (SS_DISABLE | SS_AUTODISARM));
 
 	alt_stack.ss_flags = 0;
 	TEST_SUCC(sigaltstack(&alt_stack, NULL));

test/src/apps/signal_c/signal_fd.c

@@ -187,6 +187,8 @@ void *thread_func(void *arg)
 	sleep(2);
 	pid_t pid = CHECK(getpid());
 	CHECK(tgkill(pid, pid, SIGUSR1));
+
+	return NULL;
 }
 
 FN_TEST(tgkill_other_thread)
@@ -216,6 +218,8 @@ void *thread_func2(void *arg)
 	CHECK_WITH(sigprocmask(SIG_BLOCK, NULL, &sigset),
 		   sigisemptyset(&sigset));
 	CHECK_WITH(sigpending(&sigset), sigisemptyset(&sigset));
+
+	return NULL;
 }
 
 FN_TEST(blocking_syscall_dequeue_ignored_signals)

test/src/apps/test_common.mk

@@ -13,7 +13,7 @@ C_DEPS := $(addprefix $(DEP_OUTPUT_DIR)/,$(C_SRCS:%.c=%.d))
 ASM_SRCS := $(wildcard *.S)
 ASM_OBJS := $(addprefix $(OBJ_OUTPUT_DIR)/,$(ASM_SRCS:%.S=%))
 CC ?= gcc
-C_FLAGS ?= -Wall -Werror
+C_FLAGS += -Wall -Werror
 
 .PHONY: all
 all: $(C_OBJS) $(ASM_OBJS)