/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2007 Robert N. M. Watson
* Copyright (c) 2015 Allan Jude <allanjude@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/user.h>
#include <err.h>
#include <errno.h>
#include <libprocstat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "procstat.h"
/*
* Walk the stack trace provided by the kernel and reduce it to what we
* actually want to print. This involves stripping true instruction pointers,
* frame numbers, and carriage returns as generated by stack(9). If -kk is
* specified, print the function and offset, otherwise just the function.
*/
enum trace_state { TS_FRAMENUM, TS_PC, TS_AT, TS_FUNC, TS_OFF };
static enum trace_state
kstack_nextstate(enum trace_state ts)
{
switch (ts) {
case TS_FRAMENUM:
return (TS_PC);
case TS_PC:
return (TS_AT);
case TS_AT:
return (TS_FUNC);
case TS_FUNC:
return (TS_OFF);
case TS_OFF:
return (TS_FRAMENUM);
default:
errx(-1, "kstack_nextstate");
}
}
static void
kstack_cleanup(const char *old, char *new, int kflag)
{
enum trace_state old_ts, ts;
const char *cp_old;
char *cp_new;
ts = TS_FRAMENUM;
for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) {
switch (*cp_old) {
case ' ':
case '\n':
case '+':
old_ts = ts;
ts = kstack_nextstate(old_ts);
if (old_ts == TS_OFF) {
*cp_new = ' ';
cp_new++;
}
if (kflag > 1 && old_ts == TS_FUNC) {
*cp_new = '+';
cp_new++;
}
continue;
}
if (ts == TS_FUNC || (kflag > 1 && ts == TS_OFF)) {
*cp_new = *cp_old;
cp_new++;
}
}
*cp_new = '\0';
}
static void
kstack_cleanup_encoded(const char *old, char *new, int kflag)
{
enum trace_state old_ts, ts;
const char *cp_old;
char *cp_new, *cp_loop, *cp_tofree, *cp_line;
ts = TS_FRAMENUM;
if (kflag == 1) {
for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) {
switch (*cp_old) {
case '\n':
*cp_new = *cp_old;
cp_new++;
case ' ':
case '+':
old_ts = ts;
ts = kstack_nextstate(old_ts);
continue;
}
if (ts == TS_FUNC) {
*cp_new = *cp_old;
cp_new++;
}
}
*cp_new = '\0';
cp_tofree = cp_loop = strdup(new);
} else
cp_tofree = cp_loop = strdup(old);
while ((cp_line = strsep(&cp_loop, "\n")) != NULL) {
if (strlen(cp_line) != 0 && *cp_line != 127)
xo_emit("{le:token/%s}", cp_line);
}
free(cp_tofree);
}
/*
* Sort threads by tid.
*/
static int
kinfo_kstack_compare(const void *a, const void *b)
{
return ((const struct kinfo_kstack *)a)->kkst_tid -
((const struct kinfo_kstack *)b)->kkst_tid;
}
static void
kinfo_kstack_sort(struct kinfo_kstack *kkstp, int count)
{
qsort(kkstp, count, sizeof(*kkstp), kinfo_kstack_compare);
}
void
procstat_kstack(struct procstat *procstat, struct kinfo_proc *kipp)
{
struct kinfo_kstack *kkstp, *kkstp_free;
struct kinfo_proc *kip, *kip_free;
char trace[KKST_MAXLEN], encoded_trace[KKST_MAXLEN];
unsigned int i, j;
unsigned int kip_count, kstk_count;
if ((procstat_opts & PS_OPT_NOHEADER) == 0)
xo_emit("{T:/%5s %6s %-19s %-19s %-29s}\n", "PID", "TID", "COMM",
"TDNAME", "KSTACK");
kkstp = kkstp_free = procstat_getkstack(procstat, kipp, &kstk_count);
if (kkstp == NULL)
return;
/*
* We need to re-query for thread information, so don't use *kipp.
*/
kip = kip_free = procstat_getprocs(procstat,
KERN_PROC_PID | KERN_PROC_INC_THREAD, kipp->ki_pid, &kip_count);
if (kip == NULL) {
procstat_freekstack(procstat, kkstp_free);
return;
}
kinfo_kstack_sort(kkstp, kstk_count);
for (i = 0; i < kstk_count; i++) {
kkstp = &kkstp_free[i];
/*
* Look up the specific thread using its tid so we can
* display the per-thread command line.
*/
kipp = NULL;
for (j = 0; j < kip_count; j++) {
kipp = &kip_free[j];
if (kkstp->kkst_tid == kipp->ki_tid)
break;
}
if (kipp == NULL)
continue;
xo_emit("{k:process_id/%5d/%d} ", kipp->ki_pid);
xo_emit("{:thread_id/%6d/%d} ", kkstp->kkst_tid);
xo_emit("{:command/%-19s/%s} ", kipp->ki_comm);
xo_emit("{:thread_name/%-19s/%s} ",
kinfo_proc_thread_name(kipp));
switch (kkstp->kkst_state) {
case KKST_STATE_RUNNING:
xo_emit("{:state/%-29s/%s}\n", "<running>");
continue;
case KKST_STATE_SWAPPED:
xo_emit("{:state/%-29s/%s}\n", "<swapped>");
continue;
case KKST_STATE_STACKOK:
break;
default:
xo_emit("{:state/%-29s/%s}\n", "<unknown>");
continue;
}
/*
* The kernel generates a trace with carriage returns between
* entries, but for a more compact view, we convert carriage
* returns to spaces.
*/
kstack_cleanup(kkstp->kkst_trace, trace,
(procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1);
xo_open_list("trace");
kstack_cleanup_encoded(kkstp->kkst_trace, encoded_trace,
(procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1);
xo_close_list("trace");
xo_emit("{d:trace/%-29s}\n", trace);
}
procstat_freekstack(procstat, kkstp_free);
procstat_freeprocs(procstat, kip_free);
}
