On 11/23/19 6:51 AM, Daniel T. Lee wrote:
Currently, open() is called from the user program and it calls the syscall
'sys_openat', not the 'sys_open'. This leads to an error of the program
of user side, due to the fact that the counter maps are zero since no
function such 'sys_open' is called.
This commit adds the kernel bpf program which are attached to the
tracepoint 'sys_enter_openat' and 'sys_enter_openat'.
Signed-off-by: Daniel T. Lee <danieltimlee@xxxxxxxxx>
---
samples/bpf/syscall_tp_kern.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/samples/bpf/syscall_tp_kern.c b/samples/bpf/syscall_tp_kern.c
index 1d78819ffef1..4ea91b1d3e03 100644
--- a/samples/bpf/syscall_tp_kern.c
+++ b/samples/bpf/syscall_tp_kern.c
@@ -51,9 +51,23 @@ int trace_enter_open(struct syscalls_enter_open_args *ctx)
return 0;
}
+SEC("tracepoint/syscalls/sys_enter_openat")
+int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
+{
+ count((void *)&enter_open_map);
Nit: cast to void * not needed, same in below 3 locations.
+ return 0;
+}
+
SEC("tracepoint/syscalls/sys_exit_open")
int trace_enter_exit(struct syscalls_exit_open_args *ctx)
{
count((void *)&exit_open_map);
return 0;
}
+
+SEC("tracepoint/syscalls/sys_exit_openat")
+int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
+{
+ count((void *)&exit_open_map);
+ return 0;
+}
