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libbpf: Add bpf_program__attach_kprobe_opts function

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Adding bpf_program__attach_kprobe_opts that does the same
as bpf_program__attach_kprobe, but takes opts argument.

Currently opts struct holds just retprobe bool, but we will
add new field in following patch.

The function is not exported, so there's no need to add
size to the struct bpf_program_attach_kprobe_opts for now.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210714094400.396467-7-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2021-07-14 11:43:58 +02:00 committed by Alexei Starovoitov
parent 5d8b583d04
commit ac0ed48829
1 changed files with 25 additions and 9 deletions
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34
tools/lib/bpf/libbpf.c
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@ -10346,19 +10346,24 @@ static int perf_event_open_probe(bool uprobe, bool retprobe, const char *name,
return pfd;
}
struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
bool retprobe,
const char *func_name)
struct bpf_program_attach_kprobe_opts {
bool retprobe;
};
static struct bpf_link*
bpf_program__attach_kprobe_opts(struct bpf_program *prog,
const char *func_name,
struct bpf_program_attach_kprobe_opts *opts)
{
char errmsg[STRERR_BUFSIZE];
struct bpf_link *link;
int pfd, err;
pfd = perf_event_open_probe(false /* uprobe */, retprobe, func_name,
pfd = perf_event_open_probe(false /* uprobe */, opts->retprobe, func_name,
0 /* offset */, -1 /* pid */);
if (pfd < 0) {
pr_warn("prog '%s': failed to create %s '%s' perf event: %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
prog->name, opts->retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(pfd, errmsg, sizeof(errmsg)));
return libbpf_err_ptr(pfd);
}
@ -10367,23 +10372,34 @@ struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
if (err) {
close(pfd);
pr_warn("prog '%s': failed to attach to %s '%s': %s\n",
prog->name, retprobe ? "kretprobe" : "kprobe", func_name,
prog->name, opts->retprobe ? "kretprobe" : "kprobe", func_name,
libbpf_strerror_r(err, errmsg, sizeof(errmsg)));
return libbpf_err_ptr(err);
}
return link;
}
struct bpf_link *bpf_program__attach_kprobe(struct bpf_program *prog,
bool retprobe,
const char *func_name)
{
struct bpf_program_attach_kprobe_opts opts = {
.retprobe = retprobe,
};
return bpf_program__attach_kprobe_opts(prog, func_name, &opts);
}
static struct bpf_link *attach_kprobe(const struct bpf_sec_def *sec,
struct bpf_program *prog)
{
struct bpf_program_attach_kprobe_opts opts;
const char *func_name;
bool retprobe;
func_name = prog->sec_name + sec->len;
retprobe = strcmp(sec->sec, "kretprobe/") == 0;
opts.retprobe = strcmp(sec->sec, "kretprobe/") == 0;
return bpf_program__attach_kprobe(prog, retprobe, func_name);
return bpf_program__attach_kprobe_opts(prog, func_name, &opts);
}
struct bpf_link *bpf_program__attach_uprobe(struct bpf_program *prog,