blob: c4481c390d232d7582bd182392aaa3152383e9f0 [file] [log] [blame]
// 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/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;