Commit fe330089 authored by Daniel T. Lee's avatar Daniel T. Lee Committed by Alexei Starovoitov

samples: bpf: fix syscall_tp due to unused syscall

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'.

Fixes: 1da236b6 ("bpf: add a test case for syscalls/sys_{enter|exit}_* tracepoints")
Signed-off-by: default avatarDaniel T. Lee <danieltimlee@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent bba1b2a8
...@@ -47,13 +47,27 @@ static __always_inline void count(void *map) ...@@ -47,13 +47,27 @@ static __always_inline void count(void *map)
SEC("tracepoint/syscalls/sys_enter_open") SEC("tracepoint/syscalls/sys_enter_open")
int trace_enter_open(struct syscalls_enter_open_args *ctx) int trace_enter_open(struct syscalls_enter_open_args *ctx)
{ {
count((void *)&enter_open_map); count(&enter_open_map);
return 0;
}
SEC("tracepoint/syscalls/sys_enter_openat")
int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
{
count(&enter_open_map);
return 0; return 0;
} }
SEC("tracepoint/syscalls/sys_exit_open") SEC("tracepoint/syscalls/sys_exit_open")
int trace_enter_exit(struct syscalls_exit_open_args *ctx) int trace_enter_exit(struct syscalls_exit_open_args *ctx)
{ {
count((void *)&exit_open_map); count(&exit_open_map);
return 0;
}
SEC("tracepoint/syscalls/sys_exit_openat")
int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
{
count(&exit_open_map);
return 0; return 0;
} }
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