bpf: add a test case to test single tp multiple bpf attachment (a678be5c) · Commits · 戴 / test

samples/bpf/syscall_tp_user.c

+53 −13

Original line number	Diff line number	Diff line
		@@ -23,6 +23,13 @@
		* This requires kernel CONFIG_FTRACE_SYSCALLS to be set.
		*/

		static void usage(const char *cmd)
		{
		printf("USAGE: %s [-i num_progs] [-h]\n", cmd);
		printf(" -i num_progs # number of progs of the test\n");
		printf(" -h # help\n");
		}

		static void verify_map(int map_id)
		{
		__u32 key = 0;
		@@ -32,23 +39,30 @@ static void verify_map(int map_id)
		fprintf(stderr, "map_lookup failed: %s\n", strerror(errno));
		return;
		}
		if (val == 0)
		if (val == 0) {
		fprintf(stderr, "failed: map #%d returns value 0\n", map_id);
		return;
		}
		val = 0;
		if (bpf_map_update_elem(map_id, &key, &val, BPF_ANY) != 0) {
		fprintf(stderr, "map_update failed: %s\n", strerror(errno));
		return;
		}
		}

		int main(int argc, char **argv)
		static int test(char *filename, int num_progs)
		{
		struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
		char filename[256];
		int fd;

		setrlimit(RLIMIT_MEMLOCK, &r);
		snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
		int i, fd, map0_fds[num_progs], map1_fds[num_progs];

		for (i = 0; i < num_progs; i++) {
		if (load_bpf_file(filename)) {
		fprintf(stderr, "%s", bpf_log_buf);
		return 1;
		}
		printf("prog #%d: map ids %d %d\n", i, map_fd[0], map_fd[1]);
		map0_fds[i] = map_fd[0];
		map1_fds[i] = map_fd[1];
		}

		/* current load_bpf_file has perf_event_open default pid = -1
		* and cpu = 0, which permits attached bpf execution on
		@@ -64,8 +78,34 @@ int main(int argc, char **argv)
		close(fd);

		/* verify the map */
		verify_map(map_fd[0]);
		verify_map(map_fd[1]);
		for (i = 0; i < num_progs; i++) {
		verify_map(map0_fds[i]);
		verify_map(map1_fds[i]);
		}

		return 0;
		}

		int main(int argc, char **argv)
		{
		struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
		int opt, num_progs = 1;
		char filename[256];

		while ((opt = getopt(argc, argv, "i:h")) != -1) {
		switch (opt) {
		case 'i':
		num_progs = atoi(optarg);
		break;
		case 'h':
		default:
		usage(argv[0]);
		return 0;
		}
		}

		setrlimit(RLIMIT_MEMLOCK, &r);
		snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);

		return test(filename, num_progs);
		}

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