tools/testing/selftests/coredump/coredump_socket_test.c

Source file repositories/reference/linux-study-clean/tools/testing/selftests/coredump/coredump_socket_test.c

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/coredump/coredump_socket_test.c
Extension
.c
Size
21167 bytes
Lines
775
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret < 0) {
			reason = "Unable to close detached tmpfs";
			goto fail;
		}
		self->fd_tmpfs_detached = -1;
	}

	return;
fail:
	/* This should never happen */
	fprintf(stderr, "Failed to cleanup coredump test: %s\n", reason);
}

TEST_F(coredump, socket)
{
	int pidfd, ret, status;
	pid_t pid, pid_coredump_server;
	struct stat st;
	struct pidfd_info info = {};
	int ipc_sockets[2];
	char c;

	ASSERT_TRUE(set_core_pattern("@/tmp/coredump.socket"));

	ret = socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0, ipc_sockets);
	ASSERT_EQ(ret, 0);

	pid_coredump_server = fork();
	ASSERT_GE(pid_coredump_server, 0);
	if (pid_coredump_server == 0) {
		int fd_server = -1, fd_coredump = -1, fd_peer_pidfd = -1, fd_core_file = -1;
		int exit_code = EXIT_FAILURE;

		close(ipc_sockets[0]);

		fd_server = create_and_listen_unix_socket("/tmp/coredump.socket");
		if (fd_server < 0) {
			fprintf(stderr, "socket test: create_and_listen_unix_socket failed: %m\n");
			goto out;
		}

		if (write_nointr(ipc_sockets[1], "1", 1) < 0) {
			fprintf(stderr, "socket test: write_nointr to ipc socket failed: %m\n");
			goto out;
		}

		close(ipc_sockets[1]);

		fd_coredump = accept4(fd_server, NULL, NULL, SOCK_CLOEXEC);
		if (fd_coredump < 0) {
			fprintf(stderr, "socket test: accept4 failed: %m\n");
			goto out;
		}

		fd_peer_pidfd = get_peer_pidfd(fd_coredump);
		if (fd_peer_pidfd < 0) {
			fprintf(stderr, "socket test: get_peer_pidfd failed\n");
			goto out;
		}

		if (!get_pidfd_info(fd_peer_pidfd, &info)) {
			fprintf(stderr, "socket test: get_pidfd_info failed\n");
			goto out;
		}

		if (!(info.mask & PIDFD_INFO_COREDUMP)) {
			fprintf(stderr, "socket test: PIDFD_INFO_COREDUMP not set in mask\n");
			goto out;
		}

		if (!(info.coredump_mask & PIDFD_COREDUMPED)) {
			fprintf(stderr, "socket test: PIDFD_COREDUMPED not set in coredump_mask\n");
			goto out;
		}

		fd_core_file = creat("/tmp/coredump.file", 0644);
		if (fd_core_file < 0) {
			fprintf(stderr, "socket test: creat coredump file failed: %m\n");
			goto out;
		}

		for (;;) {
			char buffer[4096];
			ssize_t bytes_read, bytes_write;

			bytes_read = read(fd_coredump, buffer, sizeof(buffer));
			if (bytes_read < 0) {
				fprintf(stderr, "socket test: read from coredump socket failed: %m\n");
				goto out;
			}

Annotation

Implementation Notes