On Thu, Aug 6, 2020 at 3:46 AM Jianlin Lv <Jianlin.Lv@xxxxxxx> wrote: > > 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@xxxxxxx> > --- > v2: > - replease CHECK_FAIL by CHECK > - fix test_tcpnotify_user failed issue Applied. Thanks
