[PATCH bpf-next] bpf: fix compilation warning of selftests

[Jianlin Lv <Jianlin.Lv@arm.com>]

Clang compiler version: 12.0.0
The following warning appears during the selftests/bpf compilation:

prog_tests/send_signal.c:51:3: warning: ignoring return value of ‘write’,
declared with attribute warn_unused_result [-Wunused-result]
   51 |   write(pipe_c2p[1], buf, 1);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~
prog_tests/send_signal.c:54:3: warning: ignoring return value of ‘read’,
declared with attribute warn_unused_result [-Wunused-result]
   54 |   read(pipe_p2c[0], buf, 1);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~
......

prog_tests/stacktrace_build_id_nmi.c:13:2: warning: ignoring return value
of ‘fscanf’,declared with attribute warn_unused_result [-Wunused-resul]
   13 |  fscanf(f, "%llu", &sample_freq);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

test_tcpnotify_user.c:133:2: warning:ignoring return value of ‘system’,
declared with attribute warn_unused_result [-Wunused-result]
  133 |  system(test_script);
      |  ^~~~~~~~~~~~~~~~~~~
test_tcpnotify_user.c:138:2: warning:ignoring return value of ‘system’,
declared with attribute warn_unused_result [-Wunused-result]
  138 |  system(test_script);
      |  ^~~~~~~~~~~~~~~~~~~
test_tcpnotify_user.c:143:2: warning:ignoring return value of ‘system’,
declared with attribute warn_unused_result [-Wunused-result]
  143 |  system(test_script);
      |  ^~~~~~~~~~~~~~~~~~~

Add code that fix compilation warning about ignoring return value and
handles any errors; Check return value of library`s API make the code
more secure.

Signed-off-by: Jianlin Lv <Jianlin.Lv@arm.com>
---
 .../selftests/bpf/prog_tests/send_signal.c    | 37 ++++++++++++++-----
 .../bpf/prog_tests/stacktrace_build_id_nmi.c  |  3 +-
 .../selftests/bpf/test_tcpnotify_user.c       | 15 ++++++--
 3 files changed, 41 insertions(+), 14 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/send_signal.c b/tools/testing/selftests/bpf/prog_tests/send_signal.c
index 504abb7bfb95..7a5272e4e810 100644
--- a/tools/testing/selftests/bpf/prog_tests/send_signal.c
+++ b/tools/testing/selftests/bpf/prog_tests/send_signal.c
@@ -48,22 +48,31 @@ static void test_send_signal_common(struct perf_event_attr *attr,
 		close(pipe_p2c[1]); /* close write */
 
 		/* notify parent signal handler is installed */
-		write(pipe_c2p[1], buf, 1);
+		if (CHECK_FAIL(write(pipe_c2p[1], buf, 1) != 1)) {
+			perror("Child: write pipe error");
+			goto close_out;
+		}
 
 		/* make sure parent enabled bpf program to send_signal */
-		read(pipe_p2c[0], buf, 1);
+		if (CHECK_FAIL(read(pipe_p2c[0], buf, 1) != 1)) {
+			perror("Child: read pipe error");
+			goto close_out;
+		}
 
 		/* wait a little for signal handler */
 		sleep(1);
 
-		if (sigusr1_received)
-			write(pipe_c2p[1], "2", 1);
-		else
-			write(pipe_c2p[1], "0", 1);
+		buf[0] = sigusr1_received ? '2' : '0';
+		if (CHECK_FAIL(write(pipe_c2p[1], buf, 1) != 1)) {
+			perror("Child: write pipe error");
+			goto close_out;
+		}
 
 		/* wait for parent notification and exit */
-		read(pipe_p2c[0], buf, 1);
+		if (CHECK_FAIL(read(pipe_p2c[0], buf, 1) != 1))
+			perror("Child: read pipe error");
 
+close_out:
 		close(pipe_c2p[1]);
 		close(pipe_p2c[0]);
 		exit(0);
@@ -99,7 +108,11 @@ static void test_send_signal_common(struct perf_event_attr *attr,
 	}
 
 	/* wait until child signal handler installed */
-	read(pipe_c2p[0], buf, 1);
+	if (CHECK_FAIL(read(pipe_c2p[0], buf, 1) != 1)) {
+		perror("Parent: read pipe error");
+		goto disable_pmu;
+	}
+
 
 	/* trigger the bpf send_signal */
 	skel->bss->pid = pid;
@@ -107,7 +120,10 @@ static void test_send_signal_common(struct perf_event_attr *attr,
 	skel->bss->signal_thread = signal_thread;
 
 	/* notify child that bpf program can send_signal now */
-	write(pipe_p2c[1], buf, 1);
+	if (CHECK_FAIL(write(pipe_p2c[1], buf, 1) != 1)) {
+		perror("Parent: write pipe error");
+		goto disable_pmu;
+	}
 
 	/* wait for result */
 	err = read(pipe_c2p[0], buf, 1);
@@ -121,7 +137,8 @@ static void test_send_signal_common(struct perf_event_attr *attr,
 	CHECK(buf[0] != '2', test_name, "incorrect result\n");
 
 	/* notify child safe to exit */
-	write(pipe_p2c[1], buf, 1);
+	if (CHECK_FAIL(write(pipe_p2c[1], buf, 1) != 1))
+		perror("Parent: write pipe error");
 
 disable_pmu:
 	close(pmu_fd);
diff --git a/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c b/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
index f002e3090d92..a27de3d46e58 100644
--- a/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
+++ b/tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
@@ -10,7 +10,8 @@ static __u64 read_perf_max_sample_freq(void)
 	f = fopen("/proc/sys/kernel/perf_event_max_sample_rate", "r");
 	if (f == NULL)
 		return sample_freq;
-	fscanf(f, "%llu", &sample_freq);
+	if (CHECK_FAIL(fscanf(f, "%llu", &sample_freq) != 1))
+		perror("Get max sample rate fail, return default value: 5000\n");
 	fclose(f);
 	return sample_freq;
 }
diff --git a/tools/testing/selftests/bpf/test_tcpnotify_user.c b/tools/testing/selftests/bpf/test_tcpnotify_user.c
index f9765ddf0761..869e28c92d73 100644
--- a/tools/testing/selftests/bpf/test_tcpnotify_user.c
+++ b/tools/testing/selftests/bpf/test_tcpnotify_user.c
@@ -130,17 +130,26 @@ int main(int argc, char **argv)
 	sprintf(test_script,
 		"iptables -A INPUT -p tcp --dport %d -j DROP",
 		TESTPORT);
-	system(test_script);
+	if (system(test_script)) {
+		printf("FAILED: execute command: %s\n", test_script);
+		goto err;
+	}
 
 	sprintf(test_script,
 		"nc 127.0.0.1 %d < /etc/passwd > /dev/null 2>&1 ",
 		TESTPORT);
-	system(test_script);
+	if (system(test_script)) {
+		printf("FAILED: execute command: %s\n", test_script);
+		goto err;
+	}
 
 	sprintf(test_script,
 		"iptables -D INPUT -p tcp --dport %d -j DROP",
 		TESTPORT);
-	system(test_script);
+	if (system(test_script)) {
+		printf("FAILED: execute command: %s\n", test_script);
+		goto err;
+	}
 
 	rv = bpf_map_lookup_elem(bpf_map__fd(global_map), &key, &g);
 	if (rv != 0) {
-- 
2.17.1