samples/bpf: add error checking for perf ioctl calls in bpf loader
load_bpf_file() should fail if ioctl with command
PERF_EVENT_IOC_ENABLE and PERF_EVENT_IOC_SET_BPF fails.
When they do fail, proper error messages are printed.
With this change, the below "syscall_tp" run shows that
the maximum number of bpf progs attaching to the same
perf tracepoint is indeed enforced.
$ ./syscall_tp -i 64
prog #0: map ids 4 5
...
prog #63: map ids 382 383
$ ./syscall_tp -i 65
prog #0: map ids 4 5
...
prog #64: map ids 388 389
ioctl PERF_EVENT_IOC_SET_BPF failed err Argument list too long
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
1 file changed