diff options
Diffstat (limited to 'tools/perf/examples/bpf/etcsnoop.c')
-rw-r--r-- | tools/perf/examples/bpf/etcsnoop.c | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/tools/perf/examples/bpf/etcsnoop.c b/tools/perf/examples/bpf/etcsnoop.c deleted file mode 100644 index e81b535346c0..000000000000 --- a/tools/perf/examples/bpf/etcsnoop.c +++ /dev/null @@ -1,76 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Augment the filename syscalls with the contents of the filename pointer argument - * filtering only those that do not start with /etc/. - * - * Test it with: - * - * perf trace -e tools/perf/examples/bpf/augmented_syscalls.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'. - * - * This matches what is marshalled into the raw_syscall:sys_enter payload - * expected by the 'perf trace' beautifiers, and can be used by them unmodified, - * which will be done as that feature is implemented in the next csets, for now - * it will appear in a dump done by the default tracepoint handler in 'perf trace', - * that uses bpf_output__fprintf() to just dump those contents, as done with - * the bpf-output event associated with the __bpf_output__ map declared in - * tools/perf/include/bpf/stdio.h. - */ - -#include <stdio.h> - -/* bpf-output associated map */ -bpf_map(__augmented_syscalls__, PERF_EVENT_ARRAY, int, u32, __NR_CPUS__); - -struct augmented_filename { - int size; - int reserved; - char value[64]; -}; - -#define augmented_filename_syscall_enter(syscall) \ -struct augmented_enter_##syscall##_args { \ - struct syscall_enter_##syscall##_args args; \ - struct augmented_filename filename; \ -}; \ -int syscall_enter(syscall)(struct syscall_enter_##syscall##_args *args) \ -{ \ - char etc[6] = "/etc/"; \ - struct augmented_enter_##syscall##_args augmented_args = { .filename.reserved = 0, }; \ - probe_read(&augmented_args.args, sizeof(augmented_args.args), args); \ - augmented_args.filename.size = probe_read_str(&augmented_args.filename.value, \ - sizeof(augmented_args.filename.value), \ - args->filename_ptr); \ - if (__builtin_memcmp(augmented_args.filename.value, etc, 4) != 0) \ - return 0; \ - /* If perf_event_output fails, return non-zero so that it gets recorded unaugmented */ \ - return perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, \ - &augmented_args, \ - (sizeof(augmented_args) - sizeof(augmented_args.filename.value) + \ - augmented_args.filename.size)); \ -} - -struct syscall_enter_openat_args { - unsigned long long common_tp_fields; - long syscall_nr; - long dfd; - char *filename_ptr; - long flags; - long mode; -}; - -augmented_filename_syscall_enter(openat); - -struct syscall_enter_open_args { - unsigned long long common_tp_fields; - long syscall_nr; - char *filename_ptr; - long flags; - long mode; -}; - -augmented_filename_syscall_enter(open); - -license(GPL); |