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libprocstat: add knowledge about NT_PROCSTAT_KQUEUES core file section

Browse source 
Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D49372
This commit is contained in:
Konstantin Belousov 2025-03-14 01:06:05 +02:00
parent debcd4c057
commit 1c3d6532ca
3 changed files with 36 additions and 2 deletions
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4
lib/libprocstat/core.c
View file

@ -109,6 +109,10 @@ static const struct psc_type_info {
.n_type = NT_PTLWPINFO,
.structsize = sizeof(struct ptrace_lwpinfo)
},
[PSC_TYPE_KQUEUES] = {
.n_type = NT_PROCSTAT_KQUEUES,
.structsize = sizeof(struct kinfo_knote)
},
};
static bool core_offset(struct procstat_core *core, off_t offset);

1
lib/libprocstat/core.h
View file

@ -43,6 +43,7 @@ enum psc_type {
PSC_TYPE_ENVV,
PSC_TYPE_AUXV,
PSC_TYPE_PTLWPINFO,
PSC_TYPE_KQUEUES,
PSC_TYPE_MAX
};

33
lib/libprocstat/libprocstat.c
View file

@ -2862,6 +2862,9 @@ struct kinfo_knote *
procstat_get_kqueue_info(struct procstat *procstat,
struct kinfo_proc *kp, int kqfd, unsigned int *count, char *errbuf)
{
struct kinfo_knote *kn, *k, *res, *rn;
size_t len, kqn;
switch (procstat->type) {
case PROCSTAT_KVM:
warnx("kvm method is not supported");
@ -2870,8 +2873,34 @@ procstat_get_kqueue_info(struct procstat *procstat,
return (procstat_get_kqueue_info_sysctl(kp->ki_pid, kqfd,
count, errbuf));
case PROCSTAT_CORE:
warnx("core method is not supported");
return (NULL);
k = procstat_core_get(procstat->core, PSC_TYPE_KQUEUES,
NULL, &len);
if (k == NULL) {
snprintf(errbuf, _POSIX2_LINE_MAX,
"getting NT_PROCSTAT_KQUEUES note failed");
*count = 0;
return (NULL);
}
for (kqn = 0, kn = k; kn < k + len / sizeof(*kn); kn++) {
if (kn->knt_kq_fd == kqfd)
kqn++;
}
res = calloc(kqn, sizeof(*res));
if (res == NULL) {
free(k);
snprintf(errbuf, _POSIX2_LINE_MAX,
"no memory");
return (NULL);
}
for (kn = k, rn = res; kn < k + len / sizeof(*kn); kn++) {
if (kn->knt_kq_fd != kqfd)
continue;
*rn = *kn;
rn++;
}
*count = kqn;
free(k);
return (res);
default:
warnx("unknown access method: %d", procstat->type);
return (NULL);