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Date: Tue, 6 Aug 2019 09:54:53 -0700
From: Andrii Nakryiko <andrii.nakryiko@...il.com>
To: Stanislav Fomichev <sdf@...gle.com>
Cc: Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH bpf-next v3 1/3] selftests/bpf: test_progs: switch to open_memstream
On Mon, Aug 5, 2019 at 8:41 AM Stanislav Fomichev <sdf@...gle.com> wrote:
>
> Use open_memstream to override stdout during test execution.
> The copy of the original stdout is held in env.stdout and used
> to print subtest info and dump failed log.
>
> test_{v,}printf are now simple wrappers around stdout and will be
> removed in the next patch.
>
> v3:
> * don't do strlen over log_buf, log_cnt has it already (Andrii Nakryiko)
>
> v2:
> * add ifdef __GLIBC__ around open_memstream (maybe pointless since
> we already depend on glibc for argp_parse)
> * hijack stderr as well (Andrii Nakryiko)
> * don't hijack for every test, do it once (Andrii Nakryiko)
> * log_cap -> log_size (Andrii Nakryiko)
> * do fseeko in a proper place (Andrii Nakryiko)
> * check open_memstream returned value (Andrii Nakryiko)
>
> Cc: Andrii Nakryiko <andriin@...com>
> Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> ---
Thanks a lot, this looks very good. Just please let's do one field per
line in structs (see below).
Acked-by: Andrii Nakryiko <andriin@...com>
> tools/testing/selftests/bpf/test_progs.c | 115 ++++++++++++-----------
> tools/testing/selftests/bpf/test_progs.h | 2 +-
> 2 files changed, 61 insertions(+), 56 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
> index db00196c8315..9556439c607c 100644
> --- a/tools/testing/selftests/bpf/test_progs.c
> +++ b/tools/testing/selftests/bpf/test_progs.c
> @@ -40,14 +40,20 @@ static bool should_run(struct test_selector *sel, int num, const char *name)
>
> static void dump_test_log(const struct prog_test_def *test, bool failed)
> {
> + if (stdout == env.stdout)
> + return;
> +
> + fflush(stdout); /* exports env.log_buf & env.log_cnt */
> +
> if (env.verbose || test->force_log || failed) {
> if (env.log_cnt) {
> - fprintf(stdout, "%s", env.log_buf);
> + fprintf(env.stdout, "%s", env.log_buf);
> if (env.log_buf[env.log_cnt - 1] != '\n')
> - fprintf(stdout, "\n");
> + fprintf(env.stdout, "\n");
> }
> }
> - env.log_cnt = 0;
> +
> + fseeko(stdout, 0, SEEK_SET); /* rewind */
> }
>
> void test__end_subtest()
> @@ -62,7 +68,7 @@ void test__end_subtest()
>
> dump_test_log(test, sub_error_cnt);
>
> - printf("#%d/%d %s:%s\n",
> + fprintf(env.stdout, "#%d/%d %s:%s\n",
> test->test_num, test->subtest_num,
> test->subtest_name, sub_error_cnt ? "FAIL" : "OK");
> }
> @@ -79,7 +85,8 @@ bool test__start_subtest(const char *name)
> test->subtest_num++;
>
> if (!name || !name[0]) {
> - fprintf(stderr, "Subtest #%d didn't provide sub-test name!\n",
> + fprintf(env.stderr,
> + "Subtest #%d didn't provide sub-test name!\n",
> test->subtest_num);
> return false;
> }
> @@ -100,53 +107,7 @@ void test__force_log() {
>
> void test__vprintf(const char *fmt, va_list args)
> {
> - size_t rem_sz;
> - int ret = 0;
> -
> - if (env.verbose || (env.test && env.test->force_log)) {
> - vfprintf(stderr, fmt, args);
> - return;
> - }
> -
> -try_again:
> - rem_sz = env.log_cap - env.log_cnt;
> - if (rem_sz) {
> - va_list ap;
> -
> - va_copy(ap, args);
> - /* we reserved extra byte for \0 at the end */
> - ret = vsnprintf(env.log_buf + env.log_cnt, rem_sz + 1, fmt, ap);
> - va_end(ap);
> -
> - if (ret < 0) {
> - env.log_buf[env.log_cnt] = '\0';
> - fprintf(stderr, "failed to log w/ fmt '%s'\n", fmt);
> - return;
> - }
> - }
> -
> - if (!rem_sz || ret > rem_sz) {
> - size_t new_sz = env.log_cap * 3 / 2;
> - char *new_buf;
> -
> - if (new_sz < 4096)
> - new_sz = 4096;
> - if (new_sz < ret + env.log_cnt)
> - new_sz = ret + env.log_cnt;
> -
> - /* +1 for guaranteed space for terminating \0 */
> - new_buf = realloc(env.log_buf, new_sz + 1);
> - if (!new_buf) {
> - fprintf(stderr, "failed to realloc log buffer: %d\n",
> - errno);
> - return;
> - }
> - env.log_buf = new_buf;
> - env.log_cap = new_sz;
> - goto try_again;
> - }
> -
> - env.log_cnt += ret;
> + vprintf(fmt, args);
> }
>
> void test__printf(const char *fmt, ...)
> @@ -477,6 +438,48 @@ static error_t parse_arg(int key, char *arg, struct argp_state *state)
> return 0;
> }
>
> +static void stdio_hijack(void)
> +{
> +#ifdef __GLIBC__
> + if (env.verbose || (env.test && env.test->force_log)) {
> + /* nothing to do, output to stdout by default */
> + return;
> + }
> +
> + /* stdout and stderr -> buffer */
> + fflush(stdout);
> +
> + env.stdout = stdout;
> + env.stderr = stderr;
> +
> + stdout = open_memstream(&env.log_buf, &env.log_cnt);
> + if (!stdout) {
> + stdout = env.stdout;
> + perror("open_memstream");
> + return;
> + }
> +
> + stderr = stdout;
> +#endif
> +}
> +
> +static void stdio_restore(void)
> +{
> +#ifdef __GLIBC__
> + if (stdout == env.stdout)
> + return;
> +
> + fclose(stdout);
> + free(env.log_buf);
> +
> + env.log_buf = NULL;
> + env.log_cnt = 0;
> +
> + stdout = env.stdout;
> + stderr = env.stderr;
> +#endif
> +}
> +
> int main(int argc, char **argv)
> {
> static const struct argp argp = {
> @@ -496,6 +499,7 @@ int main(int argc, char **argv)
>
> env.jit_enabled = is_jit_enabled();
>
> + stdio_hijack();
> for (i = 0; i < prog_test_cnt; i++) {
> struct prog_test_def *test = &prog_test_defs[i];
> int old_pass_cnt = pass_cnt;
> @@ -523,13 +527,14 @@ int main(int argc, char **argv)
>
> dump_test_log(test, test->error_cnt);
>
> - printf("#%d %s:%s\n", test->test_num, test->test_name,
> - test->error_cnt ? "FAIL" : "OK");
> + fprintf(env.stdout, "#%d %s:%s\n",
> + test->test_num, test->test_name,
> + test->error_cnt ? "FAIL" : "OK");
> }
> + stdio_restore();
> printf("Summary: %d/%d PASSED, %d FAILED\n",
> env.succ_cnt, env.sub_succ_cnt, env.fail_cnt);
>
> - free(env.log_buf);
> free(env.test_selector.num_set);
> free(env.subtest_selector.num_set);
>
> diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
> index afd14962456f..4c00fc79ac5f 100644
> --- a/tools/testing/selftests/bpf/test_progs.h
> +++ b/tools/testing/selftests/bpf/test_progs.h
> @@ -56,9 +56,9 @@ struct test_env {
> bool jit_enabled;
>
> struct prog_test_def *test;
> + FILE *stdout, *stderr;
Please, let's not do this in structs: one field per line.
> char *log_buf;
> size_t log_cnt;
> - size_t log_cap;
>
> int succ_cnt; /* successful tests */
> int sub_succ_cnt; /* successful sub-tests */
> --
> 2.22.0.770.g0f2c4a37fd-goog
>
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