2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2007 Robert N. M. Watson
5 * Copyright (c) 2015 Allan Jude <allanjude@freebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/param.h>
31 #include <sys/sysctl.h>
36 #include <libprocstat.h>
44 * Walk the stack trace provided by the kernel and reduce it to what we
45 * actually want to print. This involves stripping true instruction pointers,
46 * frame numbers, and carriage returns as generated by stack(9). If -kk is
47 * specified, print the function and offset, otherwise just the function.
49 enum trace_state { TS_FRAMENUM, TS_PC, TS_AT, TS_FUNC, TS_OFF };
51 static enum trace_state
52 kstack_nextstate(enum trace_state ts)
72 errx(-1, "kstack_nextstate");
77 kstack_cleanup(const char *old, char *new, int kflag)
79 enum trace_state old_ts, ts;
84 for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) {
90 ts = kstack_nextstate(old_ts);
91 if (old_ts == TS_OFF) {
95 if (kflag > 1 && old_ts == TS_FUNC) {
101 if (ts == TS_FUNC || (kflag > 1 && ts == TS_OFF)) {
110 kstack_cleanup_encoded(const char *old, char *new, int kflag)
112 enum trace_state old_ts, ts;
114 char *cp_new, *cp_loop, *cp_tofree, *cp_line;
118 for (cp_old = old, cp_new = new; *cp_old != '\0'; cp_old++) {
126 ts = kstack_nextstate(old_ts);
135 cp_tofree = cp_loop = strdup(new);
137 cp_tofree = cp_loop = strdup(old);
138 while ((cp_line = strsep(&cp_loop, "\n")) != NULL) {
139 if (strlen(cp_line) != 0 && *cp_line != 127)
140 xo_emit("{le:token/%s}", cp_line);
146 * Sort threads by tid.
149 kinfo_kstack_compare(const void *a, const void *b)
152 return ((const struct kinfo_kstack *)a)->kkst_tid -
153 ((const struct kinfo_kstack *)b)->kkst_tid;
157 kinfo_kstack_sort(struct kinfo_kstack *kkstp, int count)
160 qsort(kkstp, count, sizeof(*kkstp), kinfo_kstack_compare);
165 procstat_kstack(struct procstat *procstat, struct kinfo_proc *kipp)
167 struct kinfo_kstack *kkstp, *kkstp_free;
168 struct kinfo_proc *kip, *kip_free;
169 char trace[KKST_MAXLEN], encoded_trace[KKST_MAXLEN];
171 unsigned int kip_count, kstk_count;
173 if ((procstat_opts & PS_OPT_NOHEADER) == 0)
174 xo_emit("{T:/%5s %6s %-19s %-19s %-29s}\n", "PID", "TID", "COMM",
177 kkstp = kkstp_free = procstat_getkstack(procstat, kipp, &kstk_count);
182 * We need to re-query for thread information, so don't use *kipp.
184 kip = kip_free = procstat_getprocs(procstat,
185 KERN_PROC_PID | KERN_PROC_INC_THREAD, kipp->ki_pid, &kip_count);
188 procstat_freekstack(procstat, kkstp_free);
192 kinfo_kstack_sort(kkstp, kstk_count);
193 for (i = 0; i < kstk_count; i++) {
194 kkstp = &kkstp_free[i];
197 * Look up the specific thread using its tid so we can
198 * display the per-thread command line.
201 for (j = 0; j < kip_count; j++) {
203 if (kkstp->kkst_tid == kipp->ki_tid)
209 xo_emit("{k:process_id/%5d/%d} ", kipp->ki_pid);
210 xo_emit("{:thread_id/%6d/%d} ", kkstp->kkst_tid);
211 xo_emit("{:command/%-19s/%s} ", kipp->ki_comm);
212 xo_emit("{:thread_name/%-19s/%s} ",
213 kinfo_proc_thread_name(kipp));
215 switch (kkstp->kkst_state) {
216 case KKST_STATE_RUNNING:
217 xo_emit("{:state/%-29s/%s}\n", "<running>");
220 case KKST_STATE_SWAPPED:
221 xo_emit("{:state/%-29s/%s}\n", "<swapped>");
224 case KKST_STATE_STACKOK:
228 xo_emit("{:state/%-29s/%s}\n", "<unknown>");
233 * The kernel generates a trace with carriage returns between
234 * entries, but for a more compact view, we convert carriage
237 kstack_cleanup(kkstp->kkst_trace, trace,
238 (procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1);
239 xo_open_list("trace");
240 kstack_cleanup_encoded(kkstp->kkst_trace, encoded_trace,
241 (procstat_opts & PS_OPT_VERBOSE) != 0 ? 2 : 1);
242 xo_close_list("trace");
243 xo_emit("{d:trace/%-29s}\n", trace);
245 procstat_freekstack(procstat, kkstp_free);
246 procstat_freeprocs(procstat, kip_free);