34 lines
764 B
C
34 lines
764 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Hook into 'openat' syscall entry tracepoint
|
|
*
|
|
* Test it with:
|
|
*
|
|
* perf trace -e tools/perf/examples/bpf/sys_enter_openat.c cat /etc/passwd > /dev/null
|
|
*
|
|
* It'll catch some openat syscalls related to the dynamic linked and
|
|
* the last one should be the one for '/etc/passwd'.
|
|
*
|
|
* The syscall_enter_openat_args can be used to get the syscall fields
|
|
* and use them for filtering calls, i.e. use in expressions for
|
|
* the return value.
|
|
*/
|
|
|
|
#include <bpf.h>
|
|
|
|
struct syscall_enter_openat_args {
|
|
unsigned long long unused;
|
|
long syscall_nr;
|
|
long dfd;
|
|
char *filename_ptr;
|
|
long flags;
|
|
long mode;
|
|
};
|
|
|
|
int syscall_enter(openat)(struct syscall_enter_openat_args *args)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
license(GPL);
|