fix(modern_bpf): define the compat timespec in struct flavors

Signed-off-by: therealbobo <[email protected]>

driver/modern_bpf/definitions/struct_flavors.h

@@ -79,4 +79,15 @@ struct modern_bpf__kernel_timex_timeval
 	long long int tv_usec;
 };
 
+/*
+ *  This is equivalent to old_timespec32 or compat_timespec. Some old distros
+ *  don't define old_timespec32 (e.g. centos 8 with 4.18 kernel), so we define
+ *  it here.
+ */
+struct modern_bpf__kernel_timespec_ia32
+{
+	int tv_sec;
+	int tv_nsec;
+};
+
 #endif /* __STRUCT_FLAVORS_H__ */

driver/modern_bpf/programs/tail_called/events/syscall_dispatched_events/ppoll.bpf.c

@@ -55,7 +55,7 @@ int BPF_PROG(ppoll_e,
 	}
 	else
 	{
-		struct old_timespec32 ts = {0};
+		struct modern_bpf__kernel_timespec_ia32 ts = {0};
 		bpf_probe_read_user(&ts, sizeof(ts), (void *)ts_pointer);
 		nanosec = ((uint32_t)ts.tv_sec) * SECOND_TO_NS + ts.tv_nsec;
 	}